{"id":14358,"date":"2026-08-31T07:48:15","date_gmt":"2026-08-31T07:48:15","guid":{"rendered":"https:\/\/weldomachining.com\/?p=14358"},"modified":"2026-08-31T07:50:55","modified_gmt":"2026-08-31T07:50:55","slug":"what-is-a-flange-bolt","status":"publish","type":"post","link":"https:\/\/weldomachining.com\/ja\/what-is-a-flange-bolt\/","title":{"rendered":"\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8\u3068\u306f\uff1f \u7a2e\u985e\u3068\u52a0\u5de5\u30ac\u30a4\u30c9"},"content":{"rendered":"<h2 class=\"wp-block-heading\">\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h2>\n\n\n\n<p 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src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/what-is-a-flange-bolt-1.webp\" alt=\"\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8\u3068\u306f\u4f55\u3067\u3059\u304b\" class=\"wp-image-14361\" srcset=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/what-is-a-flange-bolt-1.webp 600w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/what-is-a-flange-bolt-1-300x169.webp 300w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/what-is-a-flange-bolt-1-18x10.webp 18w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8\u306f\u3069\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3059\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8\u3092\u7de0\u3081\u4ed8\u3051\u308b\u3068\u3001\u7de0\u3081\u4ed8\u3051\u30c8\u30eb\u30af\u306b\u3088\u3063\u3066\u30dc\u30eb\u30c8\u306b\u8ef8\u65b9\u5411\u306e\u5f15\u5f35\u529b\u304c\u751f\u3058\u3001\u63a5\u5408\u3055\u308c\u305f\u90e8\u54c1\u9593\u306b\u7de0\u7d50\u529b\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u30dc\u30eb\u30c8\u982d\u90e8\u306e\u4e0b\u306b\u3042\u308b\u30d5\u30e9\u30f3\u30b8\u306f\u3001\u3053\u306e\u7de0\u7d50\u529b\u3092\u3088\u308a\u5e83\u3044\u63a5\u89e6\u9762\u7a4d\u306b\u308f\u305f\u3063\u3066\u5206\u6563\u3055\u305b\u307e\u3059\u3002.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u30c7\u30b6\u30a4\u30f3\u306b\u306f\u6b21\u306e\u3088\u3046\u306a\u6a5f\u80fd\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30dc\u30eb\u30c8\u982d\u90e8\u306e\u76f4\u4e0b\u306b\u304a\u3051\u308b\u5c40\u6240\u7684\u306a\u63a5\u89e6\u5727\u3092\u4f4e\u6e1b\u3059\u308b\uff1b;<\/li>\n\n\n\n<li>\u67d4\u3089\u304b\u3044\u88ab\u52a0\u5de5\u7269\u306e\u8868\u9762\u306b\u3078\u3053\u307f\u304c\u751f\u3058\u308b\u30ea\u30b9\u30af\u3092\u4f4e\u6e1b\u3059\u308b\uff1b;<\/li>\n\n\n\n<li>\u30b9\u30ed\u30c3\u30c8\u4ed8\u304d\u307e\u305f\u306f\u5927\u304d\u3081\u306e\u53d6\u308a\u4ed8\u3051\u7a74\u306b\u95a2\u3059\u308b\u30b5\u30dd\u30fc\u30c8\u3092\u5f37\u5316\u3059\u308b\uff1b;<\/li>\n\n\n\n<li>\u5225\u9014\u306e\u30ef\u30c3\u30b7\u30e3\u30fc\u3084\u8ffd\u52a0\u306e\u7d44\u307f\u7acb\u3066\u5de5\u7a0b\u306e\u5fc5\u8981\u6027\u3092\u6e1b\u3089\u3059\uff1b;<\/li>\n\n\n\n<li>\u30d5\u30a1\u30b9\u30ca\u30fc\u306e\u8abf\u9054\u304a\u3088\u3073\u7d44\u7acb\u7ba1\u7406\u3092\u7c21\u7d20\u5316\u3057\u307e\u3059\u3002.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u30d5\u30e9\u30f3\u30b8\u305d\u306e\u3082\u306e\u3060\u3051\u3067\u306f\u3001\u63a5\u5408\u90e8\u304c\u6c7a\u3057\u3066\u7de9\u307e\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u63a5\u5408\u90e8\u306e\u525b\u6027\u3001\u521d\u671f\u4e88\u5727\u3001\u632f\u52d5\u3001\u6e29\u5ea6\u3001\u63a5\u89e6\u9762\u306e\u6469\u64e6\u3001\u304a\u3088\u3073\u7de0\u3081\u4ed8\u3051\u65b9\u6cd5\u306f\u3001\u3059\u3079\u3066\u63a5\u5408\u90e8\u306e\u4fe1\u983c\u6027\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u3059\u3002.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8\u3068\u901a\u5e38\u306e\u516d\u89d2\u30dc\u30eb\u30c8\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<strong><\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>\u6bd4\u8f03\u9805\u76ee<\/strong><\/td><td><strong>\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8<\/strong><\/td><td><strong>\u516d\u89d2\u30dc\u30eb\u30c8\uff08\u6a19\u6e96\uff09<\/strong><\/td><\/tr><tr><td>\u8ef8\u53d7\u69cb\u9020<\/td><td>\u30d8\u30c3\u30c9\u4e0b\u90e8\u306e\u4e00\u4f53\u578b\u30d5\u30e9\u30f3\u30b8<\/td><td>\u4e3b\u306b\u516d\u89d2\u982d\u306e\u4e0b\u5074\u306b\u983c\u3063\u3066\u3044\u308b<\/td><\/tr><tr><td>\u72ec\u7acb\u578b\u6d17\u6fef\u6a5f<\/td><td>\u901a\u5e38\u306f\u4e0d\u8981\u3067\u3059<\/td><td>\u591a\u304f\u306e\u5834\u5408\u3001\u5225\u9014\u53d6\u308a\u4ed8\u3051\u3089\u308c\u308b<\/td><\/tr><tr><td>\u8377\u91cd\u5206\u5e03<\/td><td>\u63a5\u89e6\u9762\u7a4d\u304c\u5e83\u3044<\/td><td>\u30d8\u30c3\u30c9\u3068\u30ef\u30c3\u30b7\u30e3\u30fc\u6b21\u7b2c\u3067\u3059<\/td><\/tr><tr><td>\u7d44\u7acb\u52b9\u7387<\/td><td>\u500b\u3005\u306e\u90e8\u54c1\u306e\u6570\u304c\u5c11\u306a\u3044<\/td><td>\u30ef\u30c3\u30b7\u30e3\u30fc\u306e\u4f75\u305b\u3066\u306e\u53d6\u308a\u4ed8\u3051\u304c\u5fc5\u8981\u306b\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059<\/td><\/tr><tr><td>\u30ed\u30c3\u30af\u8a2d\u5b9a<\/td><td>\u6ed1\u3089\u304b\u306a\u30d5\u30e9\u30f3\u30b8\u307e\u305f\u306f\u30ae\u30b6\u30ae\u30b6\u306e\u30d5\u30e9\u30f3\u30b8\u304b\u3089\u304a\u9078\u3073\u3044\u305f\u3060\u3051\u307e\u3059<\/td><td>\u901a\u5e38\u3001\u5225\u9014\u30ed\u30c3\u30af\u6a5f\u80fd\u304c\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059<\/td><\/tr><tr><td>\u4e00\u822c\u7684\u306a\u7528\u9014<\/td><td>\u81ea\u52d5\u8eca\u3001\u6a5f\u68b0\u3001\u304a\u3088\u3073\u8a2d\u5099\u306e\u7d44\u7acb<\/td><td>\u4e00\u822c\u7684\u306a\u6a5f\u68b0\u7684\u7de0\u7d50<\/td><\/tr><tr><td>\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u53ef\u80fd\u306a\u6a5f\u80fd<\/td><td>\u30d5\u30e9\u30f3\u30b8\u3001\u30bb\u30ec\u30fc\u30b7\u30e7\u30f3\u3001\u982d\u90e8\u5f62\u72b6\u3001\u30b7\u30e3\u30f3\u30af\u3001\u304a\u3088\u3073\u306d\u3058<\/td><td>\u4e3b\u306b\u982d\u90e8\u3001\u30b7\u30e3\u30f3\u30af\u3001\u304a\u3088\u3073\u306d\u3058\u90e8<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8\u306f\u3001\u78ba\u8a8d\u3092\u884c\u308f\u305a\u306b\u901a\u5e38\u306e\u30dc\u30eb\u30c8\u3084\u30ef\u30c3\u30b7\u30e3\u30fc\u306e\u4ee3\u308f\u308a\u306b\u4f7f\u7528\u3057\u3066\u306f\u306a\u308a\u307e\u305b\u3093\u3002\u4ee3\u66ff\u3059\u308b\u524d\u306b\u306f\u3001\u652f\u6301\u9762\u3001\u63a5\u5408\u90e8\u306e\u4e88\u5727\u3001\u88ab\u52a0\u5de5\u6750\u3001\u5229\u7528\u53ef\u80fd\u306a\u53d6\u308a\u4ed8\u3051\u30b9\u30da\u30fc\u30b9\u3001\u304a\u3088\u3073\u8868\u9762\u4fdd\u8b77\u306e\u8981\u4ef6\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u822c\u7684\u306a\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8\u306e\u7a2e\u985e<strong><\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u92f8\u6b6f\u72b6\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u92f8\u6b6f\u72b6\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8\u306f\u3001\u30d5\u30e9\u30f3\u30b8\u306e\u4e0b\u9762\u306b\u534a\u5f84\u65b9\u5411\u306e\u92f8\u6b6f\u72b6\u306e\u6e9d\u304c\u8a2d\u3051\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u7de0\u3081\u4ed8\u3051\u5f8c\u3001\u3053\u306e\u92f8\u6b6f\u72b6\u306e\u6e9d\u304c\u63a5\u89e6\u9762\u306b\u6a5f\u68b0\u7684\u306b\u565b\u307f\u5408\u3044\u3001\u30dc\u30eb\u30c8\u306e\u56de\u8ee2\u62b5\u6297\u3092\u9ad8\u3081\u307e\u3059\u3002.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u81ea\u52d5\u8eca\u306e\u30b7\u30e3\u30fc\u30b7\u3001\u30a8\u30f3\u30b8\u30f3\u4ed8\u5c5e\u54c1\u3001\u7523\u696d\u7528\u30d6\u30e9\u30b1\u30c3\u30c8\u3001\u632f\u52d5\u6a5f\u5668\u306a\u3069\u3067\u4e00\u822c\u7684\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u92f8\u6b6f\u72b6\u306e\u5f62\u72b6\u304c\u63a5\u89e6\u9762\u306b\u8de1\u3092\u6b8b\u3059\u305f\u3081\u3001\u3053\u306e\u8a2d\u8a08\u306f\u88c5\u98fe\u9762\u3001\u30b7\u30fc\u30eb\u9762\u3001\u8584\u3044\u30b3\u30fc\u30c6\u30a3\u30f3\u30b0\u9762\u3001\u967d\u6975\u9178\u5316\u51e6\u7406\u9762\u3001\u3042\u308b\u3044\u306f\u3088\u308a\u67d4\u3089\u304b\u3044\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u90e8\u54c1\u306b\u306f\u9069\u3057\u3066\u3044\u307e\u305b\u3093\u3002.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6ed1\u9762\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ed1\u3089\u304b\u306a\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8\u306f\u3001\u5747\u4e00\u306a\u5ea7\u9762\u3092\u5099\u3048\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u7de0\u3081\u4ed8\u3051\u529b\u3092\u5747\u7b49\u306b\u5206\u6563\u3055\u305b\u308b\u3068\u540c\u6642\u306b\u3001\u88ab\u52a0\u5de5\u7269\u306e\u30b3\u30fc\u30c6\u30a3\u30f3\u30b0\u3084\u7cbe\u5bc6\u4ed5\u4e0a\u3052\u9762\u3078\u306e\u30c0\u30e1\u30fc\u30b8\u3092\u8efd\u6e1b\u3057\u307e\u3059\u3002.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5857\u88c5\u6e08\u307f\u306e\u677f\u91d1\u90e8\u54c1\u3001\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u88fd\u30cf\u30a6\u30b8\u30f3\u30b0\u3001\u7cbe\u5bc6\u306a\u53d6\u308a\u4ed8\u3051\u9762\u3001\u304a\u3088\u3073\u7e70\u308a\u8fd4\u3057\u5206\u89e3\u304c\u5fc5\u8981\u306a\u30a2\u30bb\u30f3\u30d6\u30ea\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u516d\u89d2\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u516d\u89d2\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8\u306f\u3001\u5916\u516d\u89d2\u982d\u3092\u5099\u3048\u3066\u304a\u308a\u3001\u6a19\u6e96\u7684\u306a\u30ec\u30f3\u30c1\u3084\u30bd\u30b1\u30c3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u53d6\u308a\u4ed8\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u81ea\u52d5\u8eca\u3001\u6a5f\u68b0\u3001\u304a\u3088\u3073\u4e00\u822c\u7684\u306a\u7523\u696d\u7528\u7d44\u7acb\u306b\u304a\u3044\u3066\u3001\u6700\u3082\u4e00\u822c\u7684\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8\u306e\u8a2d\u8a08\u306e\u4e00\u3064\u3067\u3059\u3002.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">12\u30dd\u30a4\u30f3\u30c8\u30d5\u30e9\u30f3\u30b8\u30dc\u30eb\u30c8<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">12\u70b9\u30d8\u30c3\u30c9\u306f\u3001\u5de5\u5177\u306e\u565b\u307f\u5408\u308f\u305b\u4f4d\u7f6e\u304c\u5897\u3048\u3001\u4f5c\u52d5\u89d2\u5ea6\u304c\u9650\u3089\u308c\u3066\u3044\u308b\u3001\u3042\u308b\u3044\u306f\u30d8\u30c3\u30c9\u30b9\u30da\u30fc\u30b9\u304c\u5236\u9650\u3055\u308c\u3066\u3044\u308b\u30a2\u30bb\u30f3\u30d6\u30ea\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002\u30d1\u30ef\u30fc\u30c8\u30ec\u30a4\u30f3\u30b7\u30b9\u30c6\u30e0\u3001\u30ec\u30fc\u30b9\u7528\u90e8\u54c1\u3001\u822a\u7a7a\u5b87\u5b99\u6a5f\u5668\u3001\u304a\u3088\u3073\u9ad8\u6027\u80fd\u6a5f\u68b0\u306a\u3069\u3067\u4e00\u822c\u7684\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Socket Flange Bolts<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A socket flange bolt is installed with a hex key and is suitable for automation equipment and precision machinery where radial space is limited or an external wrench cannot be used conveniently.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Parts Commonly Use Flange Bolts?<strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Flange bolts are suitable for connections that require a larger bearing area, fewer washers, or greater assembly efficiency.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u822c\u7684\u306a\u7528\u9014\u306f\u4ee5\u4e0b\u306e\u901a\u308a\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Engine brackets and transmission housings;<\/li>\n\n\n\n<li>Automotive chassis, suspension, and braking systems;<\/li>\n\n\n\n<li>New-energy vehicle battery housings and electric-drive systems;<\/li>\n\n\n\n<li>Motors, gearboxes, and transmission assemblies;<\/li>\n\n\n\n<li>Pump bodies, valve bodies, and compressors;<\/li>\n\n\n\n<li>Industrial robot joints;<\/li>\n\n\n\n<li>Automation equipment and precision fixtures;<\/li>\n\n\n\n<li>Construction and agricultural machinery;<\/li>\n\n\n\n<li>Electrical cabinets and equipment frames;<\/li>\n\n\n\n<li>Marine equipment and outdoor machinery.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Actual selection cannot be based solely on the industry or part name. Load direction, vibration level, installation space, operating temperature, and workpiece surface condition must also be considered.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Technical Specifications Must Be Confirmed When Purchasing Flange Bolts?<strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A buyer should not provide only a brief description such as \u201cM8 flange bolt.\u201d Even when the thread diameter is the same, the flange, head, pitch, material, and property class may be entirely different.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Product Standard<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Specify the ISO, ASME, DIN, JIS, company, or customer-drawing standard and confirm the applicable revision.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><u>ISO 4162:2012<\/u>\u00a0applies to certain small-series hexagon flange bolts from M5 to M16. <u>ASME B18.2.1<\/u>\u00a0covers inch-series hex flange head screws and other products.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If an obsolete standard or an internal company standard is used, the drawing should retain all dimensions and tolerances to prevent misunderstandings between different revisions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Thread Specification<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Specify whether the thread is metric, UNC, or UNF, along with the nominal diameter, pitch, direction, tolerance class, and effective thread length.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, M10 \u00d7 1.25-6g provides more complete manufacturing and inspection information than simply specifying M10.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Flange Geometry<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Specify the flange outside diameter, thickness, radii, chamfers, and bearing-face design. For a serrated flange, the serration direction, depth, and distribution should also be defined by the product standard or drawing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Head and Shank<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Specify an external hex, 12-point, internal hex, or another drive form, together with the head height, width across flats, plain shank, steps, locating sections, and undercuts.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Material and Mechanical Properties<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The material grade and finished property class must be specified separately. 4140 and 42CrMo4 are material grades, while 8.8, 10.9, and 12.9 are fastener property classes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The finished bolt\u2019s property class can be confirmed only when the material, heat treatment, and mechanical properties all meet the applicable requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u8868\u9762\u51e6\u7406<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Specify the treatment type, coating thickness, color, corrosion-resistance requirements, and thread-dimension allowances. Surface treatment changes the coefficient of friction, so installation torque must correspond to the final surface condition.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u54c1\u8cea\u306b\u95a2\u3059\u308b\u6587\u66f8<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Material certificates, first-article reports, heat-treatment records, and surface-treatment reports affect price and lead time and must be specified before purchase rather than added after production is complete.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"700\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/titanium-anodizing.webp\" alt=\"titanium anodizing\" class=\"wp-image-13902\" srcset=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/titanium-anodizing.webp 700w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/titanium-anodizing-300x300.webp 300w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/titanium-anodizing-150x150.webp 150w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/titanium-anodizing-12x12.webp 12w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Should You Purchase a Standard Part, a Modified Part, or a Custom CNC-Machined Part?<strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Not every flange bolt requires CNC machining. Selecting the correct manufacturing route helps control cost and lead time.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Procurement option<\/strong><\/td><td><strong>Suitable situation<\/strong><\/td><td><strong>\u4e3b\u306a\u5229\u70b9<\/strong><\/td><\/tr><tr><td>Standard flange bolt<\/td><td>Standard dimensions, material, and property class meet the requirements<\/td><td>Lower cost and stable supply<\/td><\/tr><tr><td>Modified standard part<\/td><td>Only shortening, drilling, slotting, or a surface-treatment adjustment is required<\/td><td>More economical than full customization<\/td><\/tr><tr><td>Fully custom CNC-machined part<\/td><td>The flange, head, shank, thread, or material is non-standard<\/td><td>Suitable for prototypes, special geometries, and small batches<\/td><\/tr><tr><td>Cold-headed or forged production<\/td><td>The design is stable and long-term demand is high<\/td><td>Lower unit cost in volume, but tooling investment is required<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">When to Prioritize a Standard Part<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A standard part should be purchased first when the standard product\u2019s thread, length, flange, material, property class, and surface treatment all satisfy the design.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">When to Modify a Standard Part<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If the body of a standard bolt can be used and only shortening, drilling, slotting, adjustment of thread length, or a different surface treatment is required, modifying a standard part can be evaluated.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before modification, check whether the additional machining will damage the original heat-treated layer, coating, or mechanical properties.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">When Full CNC Customization Is Appropriate<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The following projects are more suitable for CNC machining:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Non-standard flange diameter or thickness;<\/li>\n\n\n\n<li>Special head or drive geometry;<\/li>\n\n\n\n<li>Stepped, locating, or reduced-diameter shanks;<\/li>\n\n\n\n<li>Special pitch, left-hand, or multi-start threads;<\/li>\n\n\n\n<li>Titanium alloys, nickel-based alloys, or special stainless steels;<\/li>\n\n\n\n<li>Prototype and small-batch validation;<\/li>\n\n\n\n<li>Spare parts for discontinued equipment;<\/li>\n\n\n\n<li>Reverse engineering from an existing sample;<\/li>\n\n\n\n<li>Drawing requirements for concentricity, runout, or face perpendicularity;<\/li>\n\n\n\n<li>Material and dimensional traceability requirements.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What Metal Materials Can Be Used for Flange Bolts?<strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Weldo Machining can evaluate flange bolts in carbon steel, alloy steel, stainless steel, aluminum alloy, titanium alloy, nickel-based alloy, and copper alloy based on customer drawings or approved samples.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Material category<\/strong><\/td><td><strong>\u4e00\u822c\u7684\u306a\u7b49\u7d1a<\/strong><\/td><td><strong>Main characteristics<\/strong><\/td><td><strong>\u4ee3\u8868\u7684\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3<\/strong><\/td><\/tr><tr><td>\u70ad\u7d20\u92fc\u304a\u3088\u3073\u5408\u91d1\u92fc<\/td><td>1045, C45, <a href=\"https:\/\/weldomachining.com\/ja\/aisi-4140-material\/\" data-type=\"post\" data-id=\"10044\">4140<\/a>, 42CrMo4, <a href=\"https:\/\/weldomachining.com\/ja\/4340-steel-guide\/\" data-type=\"post\" data-id=\"13101\">4340<\/a><\/td><td>High strength with good fatigue resistance and heat-treatment response<\/td><td>Automotive, heavy equipment, and industrial machinery<\/td><\/tr><tr><td>\u30b9\u30c6\u30f3\u30ec\u30b9<\/td><td>303, 304\/304L, 316\/316L, 17-4PH<\/td><td>Corrosion resistant, with options that balance strength and machinability<\/td><td>Food equipment, pumps and valves, marine, and outdoor equipment<\/td><\/tr><tr><td>\u30a2\u30eb\u30df\u30cb\u30a6\u30e0\u5408\u91d1<\/td><td>6061-T6\u30016082-T6\u30017075-T6<\/td><td>Lightweight, corrosion resistant, and readily machinable<\/td><td>Electronic equipment, instruments, and lightweight assemblies<\/td><\/tr><tr><td>\u30c1\u30bf\u30f3\u5408\u91d1<\/td><td>2\u5e74\u751f\u30015\u5e74\u751f<\/td><td>High strength-to-weight ratio and good corrosion resistance<\/td><td>Aerospace, marine, and specialized equipment<\/td><\/tr><tr><td>Nickel-based alloy<\/td><td>Inconel 625, Inconel 718, <a href=\"https:\/\/weldomachining.com\/ja\/hastelloy-guide\/\" data-type=\"post\" data-id=\"9441\">\u30cf\u30b9\u30c6\u30ed\u30a4<\/a> C276<\/td><td>Resistant to high temperatures and chemical corrosion<\/td><td>Energy, chemical processing, and high-temperature exhaust systems<\/td><\/tr><tr><td>\u771f\u936e\u3068\u30d6\u30ed\u30f3\u30ba<\/td><td>C360, C630, C954<\/td><td>Good machinability, corrosion resistance, or electrical conductivity<\/td><td>Electrical equipment, instruments, and marine assemblies<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">For high-strength steel flange bolts with electroplated finishes, the risk of hydrogen embrittlement must be evaluated. The final material, heat treatment, coating, and performance-verification method should be confirmed in the drawing or purchase order.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Can Engineering Plastics Be Used to Machine Flange Bolts?<strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. Engineering-plastic flange bolts are suitable for lightly loaded assemblies that require electrical insulation, chemical resistance, weight reduction, or non-magnetic performance.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Engineering plastic<\/strong><\/td><td><strong>Main characteristics<\/strong><\/td><td><strong>\u9069\u5207\u306a\u74b0\u5883<\/strong><\/td><td><strong>\u5236\u9650\u4e8b\u9805<\/strong><\/td><\/tr><tr><td>\u30ca\u30a4\u30ed\u30f3\/PA<\/td><td>Lightweight, tough, and electrically insulating<\/td><td>Electronic equipment, covers, and light-duty machinery<\/td><td>Moisture absorption, creep, and limited tightening torque<\/td><\/tr><tr><td>POM<\/td><td>Low moisture absorption, good dimensional stability, and low friction<\/td><td>Instruments and precision light-duty assemblies<\/td><td>Unsuitable for prolonged high-temperature service<\/td><\/tr><tr><td>\u8997\u304d\u898b<\/td><td>Heat resistant, chemically resistant, with relatively good mechanical performance<\/td><td>Semiconductor, chemical-processing, and electrical equipment<\/td><td>High cost and lower stiffness than metal<\/td><\/tr><tr><td>PVDF<\/td><td>Chemical resistance, weather resistance, and electrical insulation<\/td><td>Chemical-processing and laboratory equipment<\/td><td>Lower load capacity than metal<\/td><\/tr><tr><td>PTFE<\/td><td>Corrosion resistant with a very low coefficient of friction<\/td><td>Specialized corrosive environments<\/td><td>Significant creep and poor preload retention<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Engineering-plastic bolts cannot directly replace high-strength metal flange bolts. Tightening torque, sustained load, temperature, humidity, chemical media, thread engagement, and long-term creep must be controlled during design.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Weldo can evaluate non-standard engineering-plastic flange bolts in materials such as PA, POM, PEEK, and PVDF based on drawings. Plastic hex fasteners are also commercially available in nylon, PA, PEEK, PP, and PVDF. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Common Surface Treatments for Flange Bolts<strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Surface treatment affects corrosion resistance, wear resistance, appearance, dimensions, and installation friction. A drawing should not merely state \u201crust prevention\u201d; it should define the treatment type, thickness, color, and acceptance requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e9c\u925b\u30e1\u30c3\u30ad<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Zinc plating provides sacrificial corrosion protection for carbon- and alloy-steel parts, and the purchase specification should define the electroplating or other zinc process, color, thickness, salt-spray requirement, and hexavalent-chromium restriction.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30cb\u30c3\u30b1\u30eb\u3081\u3063\u304d<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Nickel plating improves the corrosion resistance, wear resistance, and appearance of steel, brass, and copper-alloy flange bolts, and the specification should distinguish electroplated nickel from electroless nickel and define the coating thickness.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d6\u30e9\u30c3\u30af\u30aa\u30ad\u30b5\u30a4\u30c9<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/weldomachining.com\/ja\/black-oxide\/\" data-type=\"post\" data-id=\"9808\">\u30d6\u30e9\u30c3\u30af\u30aa\u30ad\u30b5\u30a4\u30c9<\/a> forms a black conversion layer on steel, primarily improving appearance and providing limited rust protection, and it normally requires supplementary rust-preventive oil.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30ea\u30f3\u9178\u5869\u30b3\u30fc\u30c6\u30a3\u30f3\u30b0<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Phosphate coating improves oil retention, friction behavior, and the adhesion of subsequent coatings on steel bolts, and the drawing should identify zinc or manganese phosphate and whether a sealer is required.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Zinc-Flake Coating<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Zinc-flake coating is suitable for automotive and outdoor fasteners that require higher corrosion resistance, and the specification should define the coating system, thickness, salt-spray duration, and coefficient-of-friction range.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Stainless-Steel Passivation<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/weldomachining.com\/ja\/%e3%82%b9%e3%83%86%e3%83%b3%e3%83%ac%e3%82%b9%e9%8b%bc%e4%b8%8d%e5%8b%95%e6%85%8b%e5%8c%96%e5%87%a6%e7%90%86\/\" data-type=\"post\" data-id=\"6140\">\u4e0d\u52d5\u614b\u5316<\/a> removes free iron and machining contamination from stainless-steel surfaces to help restore a stable corrosion-resistant surface, but it does not form a metal coating of significant thickness.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u96fb\u89e3\u7814\u78e8<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Electropolishing removes a small amount of material from a stainless-steel surface to reduce microscopic peaks and is suitable for assemblies that require improved cleanliness, appearance, and corrosion performance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Standard Anodizing<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b9\u30bf\u30f3\u30c0\u30fc\u30c9 <a href=\"https:\/\/weldomachining.com\/ja\/how-to-anodize-aluminum\/\" data-type=\"post\" data-id=\"9728\">\u30a2\u30eb\u30de\u30a4\u30c8<\/a> forms an oxide layer on aluminum alloy to improve corrosion resistance and appearance, and the specification should define the color, film thickness, and whether threads must be masked.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u786c\u8cea\u30a2\u30eb\u30de\u30a4\u30c8<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Hard anodizing forms a thicker, wear-resistant oxide layer suitable for mechanical components, but dimensional allowance must be made for its effect on outside diameters, holes, and thread fit.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5316\u5b66\u8ee2\u63db\u76ae\u819c\u51e6\u7406<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Chemical conversion coating is suitable for aluminum parts that require corrosion protection, paint preparation, or electrical conductivity, and the purchase specification should define conductivity, color, and environmental requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Titanium Anodizing<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Titanium anodizing can create identification colors through an oxide film and improve surface condition, and it is commonly used for assembly identification in aerospace, medical, and precision equipment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7814\u78e8<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6a5f\u68b0 <a href=\"https:\/\/weldomachining.com\/ja\/%e7%a0%94%e7%a3%a8%e4%bb%95%e4%b8%8a%e3%81%92\/\" data-type=\"post\" data-id=\"6143\">\u7814\u78e8<\/a> can reduce surface roughness and improve the appearance of stainless-steel, brass, bronze, or titanium bolts, but excessive material removal from critical bearing faces must be avoided.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Deburring and Polishing Engineering Plastics<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Engineering-plastic parts are normally left in the as-machined condition, with fine deburring or localized polishing used to improve thread entries, flange edges, and visible surfaces.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Critical joints should have their installation torque validated in the final material, coating, and lubrication condition; torque data for untreated bolts must not be applied directly.<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"600\" height=\"338\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/different-type-of-flange-bolt.webp\" alt=\"different type of flange bolt\" class=\"wp-image-14360\" srcset=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/different-type-of-flange-bolt.webp 600w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/different-type-of-flange-bolt-300x169.webp 300w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/different-type-of-flange-bolt-18x10.webp 18w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Non-Standard Features Can Weldo Machining Produce?<strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Weldo can use <a href=\"https:\/\/weldomachining.com\/ja\/%e3%82%b5%e3%83%bc%e3%83%93%e3%82%b9\/cnc%e6%97%8b%e7%9b%a4\/\" data-type=\"page\" data-id=\"43\">CNC\u65cb\u76e4\u52a0\u5de5<\/a> and milling to produce drawing-specified flange-bolt features, including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Special <a href=\"https:\/\/weldomachining.com\/ja\/flange-parts-machining\/\" data-type=\"page\" data-id=\"13446\">\u30d5\u30e9\u30f3\u30b8<\/a> diameters and thicknesses;<\/li>\n\n\n\n<li>Hex, 12-point, and internal-hex heads;<\/li>\n\n\n\n<li>Smooth or serrated bearing faces;<\/li>\n\n\n\n<li>Stepped, reduced-diameter, and locating shanks;<\/li>\n\n\n\n<li>Cross holes, slots, and mechanical locking features;<\/li>\n\n\n\n<li>Metric, UNC, and UNF threads;<\/li>\n\n\n\n<li>Left-hand threads and special pitches;<\/li>\n\n\n\n<li>Metal and selected engineering-plastic fasteners;<\/li>\n\n\n\n<li>Prototypes, maintenance spares, and small-batch parts.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Weldo determines whether a modified standard part or full <a href=\"https:\/\/weldomachining.com\/ja\/cnc%e5%8a%a0%e5%b7%a5\/\">CNC\u52a0\u5de5<\/a> is more appropriate based on the drawing, material, quantity, and performance requirements.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Factors Affect the Price and Lead Time of Custom Flange Bolts?<strong><\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u539f\u6750\u6599<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Standard steel, stainless steel, titanium alloy, PEEK, and nickel-based alloys differ in material cost, minimum purchase quantity, and machining difficulty.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Geometric Complexity<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Special flanges, 12-point heads, internal hex features, stepped shanks, cross holes, slots, and locking serrations add setups and machining operations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Thread-Manufacturing Method<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Cut threads are suitable for prototypes and non-standard specifications, while rolled threads are more appropriate for stable production designs but require the correct material condition and process preparation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Heat Treatment and Surface Treatment<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Hardening, tempering, plating, passivation, and anodizing add production stages, and dedicated verification can further extend lead time.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Purchase Quantity<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Small-batch orders are affected mainly by programming, tooling, and first-article inspection costs, while higher quantities may justify reevaluation of cold heading, forging, or dedicated tooling.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u691c\u67fb\u66f8\u985e<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Material certificates, FAI, PPAP, hardness records, and coating reports increase inspection work and must therefore be specified before quotation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Manufacturing Process for Custom Flange Bolts<strong><\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Drawing Review<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Review the thread, head, flange, shank, material, performance, heat treatment, surface treatment, and inspection requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Manufacturing-Route Selection<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Determine whether to use a modified standard part, full CNC machining, thread rolling, cold heading, or another manufacturing method based on geometry and quantity.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Material Preparation<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Verify the material grade, supply condition, and material certificate, then cut the bar stock to the required length.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. CNC Turning<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Machine the flange profile, bearing face, shank, steps, locating surfaces, and thread-preparation diameter.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5. <a href=\"https:\/\/weldomachining.com\/ja\/%e3%82%b5%e3%83%bc%e3%83%93%e3%82%b9\/cnc%e3%83%95%e3%83%a9%e3%82%a4%e3%82%b9%e5%8a%a0%e5%b7%a5\/\" data-type=\"page\" data-id=\"41\">CNC\u30d5\u30e9\u30a4\u30b9\u52a0\u5de5<\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Machine the hex, 12-point, internal hex, cross holes, slots, or other drive and locking features.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6. Thread Production<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Select cutting, rolling, or another appropriate thread-manufacturing method based on material, quantity, and performance requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">7. <a href=\"https:\/\/weldomachining.com\/ja\/heat-treatment-guide\/\" data-type=\"post\" data-id=\"10014\">\u71b1\u51e6\u7406<\/a> and Surface Treatment<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Complete hardening, tempering, passivation, plating, anodizing, or another treatment as specified by the drawing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">8. Inspection and Packaging<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Complete dimensional, thread, hardness, coating, and visual inspection, then protect the threads and surfaces during packaging.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"540\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/03\/weldo-machining-center.webp\" alt=\"\u30a6\u30a7\u30eb\u30c9\u30de\u30b7\u30cb\u30f3\u30b0\u30bb\u30f3\u30bf\u30fc\" class=\"wp-image-7899\" style=\"width:600px\" srcset=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/03\/weldo-machining-center.webp 800w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/03\/weldo-machining-center-300x203.webp 300w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/03\/weldo-machining-center-768x518.webp 768w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/03\/weldo-machining-center-18x12.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Must Be Inspected on Custom Flange Bolts?<strong><\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Thread GO\/NO-GO Gauging<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Use the corresponding thread ring gauges to confirm that the external thread assembles correctly and that the treated thread still meets tolerance requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Thread Pitch and Form<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Use thread gauges, optical equipment, or profile measurement to confirm pitch, flank angle, and root form, with special threads inspected by the method specified on the drawing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Flange Dimensions<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Measure the flange outside diameter, thickness, radii, and chamfers to confirm that the flange provides the specified bearing area without interfering with adjacent parts.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Head Dimensions<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Inspect the hex width across flats, 12-point profile, internal hex, and head height to ensure correct engagement with the installation tool.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Shank Diameter and Straightness<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Measure the plain shank, steps, and locating sections and check for bending that could interfere with assembly.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Overall Length and Thread Length<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Inspect the under-head length, overall length, effective thread length, and thread-relief position to prevent insufficient engagement or loss of location.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Face Runout and Perpendicularity<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Inspect the runout and perpendicularity of the flange bearing face relative to the bolt axis to prevent eccentric loading after tightening.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u786c\u5ea6<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Hardness testing verifies the heat-treated condition, while critical products also require tensile or proof-load testing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30b3\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u539a\u3055<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Measure the coating or conversion-layer thickness to confirm corrosion requirements and dimensional effects and to prevent excessive buildup from obstructing thread assembly.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u8868\u9762\u7c97\u3055<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Measure the roughness of the flange bearing face, locating section, or other specified surface to verify friction, fit, or sealing requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Burrs and Visual Condition<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Inspect thread entries, flange edges, cross holes, and slots for burrs, cracks, impact damage, or coating defects.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7d20\u6750\u8a8d\u8a3c<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Verify the material grade, heat number, chemical composition, and supply condition, and link the source-material records to the finished batch.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Batch Traceability<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Confirm that part labels, packaging, material records, production records, and inspection records use a consistent batch number.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">First-Article Dimensional Report<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Inspect the agreed dimensions on the first article before batch production to confirm the program, tooling, and measurement method.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"719\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/HAAS-5-axis-machining-center.webp\" alt=\"HAAS 5 axis machining center\" class=\"wp-image-14271\" srcset=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/HAAS-5-axis-machining-center.webp 700w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/HAAS-5-axis-machining-center-292x300.webp 292w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/HAAS-5-axis-machining-center-12x12.webp 12w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Quality Documents Must Be Defined at the Quotation Stage?<strong><\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">FAI<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">FAI confirms whether the first manufactured part complies with the drawing, and the buyer should specify a full-dimensional, key-characteristic, or industry-specific format.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">PPAP Documentation<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">PPAP is used for production-process approval in automotive projects, and the quotation request should specify the submission level, sample quantity, and required documents.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Material Test Report<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The material report verifies the grade, chemical composition, mechanical properties, and heat information and should correspond to the production batch.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Heat-Treatment Report<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The heat-treatment report records the process, temperature, time, and results and is used to confirm compliance with hardness or mechanical-property requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Surface-Treatment Report<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The surface-treatment report verifies the coating type, film thickness, color, and corrosion-test results.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Tensile Testing<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Tensile testing verifies the finished part\u2019s tensile strength, yield behavior, or fracture condition, and the sampling quantity and acceptance basis must be specified.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Proof-Load Testing<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Proof-load testing confirms that the bolt does not undergo unacceptable permanent deformation under a specified axial load.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Torque\u2013Tension Testing<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Torque\u2013tension testing evaluates the relationship between installation torque and preload under the actual coating and lubrication condition.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Salt-Spray Testing<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Salt-spray testing verifies the corrosion performance of the coating system, and the test duration and failure criteria must be specified.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Batch-Traceability Documentation<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Traceability documentation links finished parts to raw material, machining, heat treatment, surface treatment, and inspection records.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>The documents and tests above are not automatically included in a standard order and must be specified in the quotation request and purchase order.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Should You Select a Custom Flange-Bolt Supplier?<strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When purchasing non-standard flange bolts, do not compare unit price alone. Also check whether the supplier can:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Review the thread, flange, head, and shank geometry;<\/li>\n\n\n\n<li>Distinguish between material grade and property class;<\/li>\n\n\n\n<li>Determine whether modification of a standard part or full CNC machining is more appropriate;<\/li>\n\n\n\n<li>Use the corresponding thread gauges;<\/li>\n\n\n\n<li>Control heat treatment and surface treatment;<\/li>\n\n\n\n<li>Provide material and batch traceability;<\/li>\n\n\n\n<li>Support sample or first-article approval;<\/li>\n\n\n\n<li>Inspect runout, concentricity, and perpendicularity;<\/li>\n\n\n\n<li>Provide the agreed dimensional report;<\/li>\n\n\n\n<li>Protect precision threads and visible surfaces;<\/li>\n\n\n\n<li>Isolate, analyze, and correct nonconforming products.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For long-term procurement programs, sample lead time, production lead time, batch management, packaging method, and annual demand should also be confirmed separately.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Information Is Needed to Quote Custom Flange Bolts?<strong><\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">2D Drawing<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The 2D drawing defines dimensions, tolerances, threads, material, surface treatment, and inspection requirements; critical dimensions must not be communicated only through a 3D model.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3D Model<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A STEP or similar 3D model helps identify the overall geometry, interference relationships, and special contours.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Product Standard<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Specify the ISO, ASME, DIN, JIS, or company standard and the applicable revision to prevent inconsistencies between standards.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Thread Specification<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Provide the thread system, nominal diameter, pitch, direction, and tolerance, such as M10 \u00d7 1.25-6g.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Length and Shank<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Specify the under-head length, effective thread length, plain shank, steps, and locating-section dimensions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Flange Geometry<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Specify the flange outside diameter, thickness, radii, chamfers, and smooth or serrated bearing face.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Head Style<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Specify a hex, 12-point, internal hex, or another design, together with the tool-fit dimensions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Material and Condition<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Define the material standard, specific grade, and supply or heat-treated condition; \u201cstainless steel\u201d or \u201chigh-strength steel\u201d alone is not sufficient.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Performance Requirements<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Specify the property class or directly define tensile strength, yield strength, hardness, and other mechanical properties.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u8868\u9762\u51e6\u7406<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Specify the treatment type, thickness, color, salt-spray requirement, coefficient of friction, and areas that must be masked.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Purchase Quantity<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Provide the prototype quantity, initial order quantity, and estimated annual demand separately so that the appropriate manufacturing route can be selected.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u691c\u67fb\u66f8\u985e<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Specify FAI, PPAP, material certification, hardness, coating reports, and other special testing requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30b5\u30fc\u30d3\u30b9\u74b0\u5883<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Provide load, vibration, temperature, corrosive media, and indoor or outdoor service conditions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u68b1\u5305\u3068\u914d\u9001<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Specify rust prevention, thread protection, batch labels, sample due date, and production-delivery arrangements.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"394\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/weldo-worker-discuss-the-machining-quality.webp\" alt=\"\u30a6\u30a7\u30eb\u30c9\u793e\u306e\u4f5c\u696d\u54e1\u304c\u52a0\u5de5\u54c1\u8cea\u306b\u3064\u3044\u3066\u8a71\u3057\u5408\u3046\" class=\"wp-image-14246\" srcset=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/weldo-worker-discuss-the-machining-quality.webp 700w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/weldo-worker-discuss-the-machining-quality-300x169.webp 300w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/weldo-worker-discuss-the-machining-quality-18x10.webp 18w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How Does Weldo Machining Support Non-Standard Flange-Bolt Projects?<strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Weldo Machining can evaluate metal and selected engineering-plastic flange bolts based on drawings or approved samples.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Project review includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Whether a standard part can be used directly;<\/li>\n\n\n\n<li>Whether modification of a standard part is appropriate;<\/li>\n\n\n\n<li>The CNC turning and milling route;<\/li>\n\n\n\n<li>The thread-manufacturing method;<\/li>\n\n\n\n<li>Material, heat treatment, and surface treatment;<\/li>\n\n\n\n<li>First-article and batch inspection requirements;<\/li>\n\n\n\n<li>Prototype and subsequent production planning.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Complete drawings, material, quantity, and quality-document requirements help support a more accurate evaluation of the manufacturing route, price, and lead time.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u8cea\u554f<strong><\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What Do M6, M8, and M10 Mean?<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The letter \u201cM\u201d indicates an ISO metric thread, and the following number is the nominal major thread diameter in millimeters; it is not the bolt-head or flange diameter.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Which Type of Bolt Thread Is Strongest?<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No single thread is best for every service condition; fine threads generally provide a larger tensile-stress area, while coarse threads better resist damage and are more suitable for softer materials and frequent assembly.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How Is the Installation Torque for a Flange Bolt Determined?<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Installation torque must be determined from the thread, property class, coating, lubrication, target preload, and internal-thread strength, and critical joints should use validated torque\u2013tension data.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can Serrated Flange Bolts Be Reused?<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The serrations, threads, head, and contact surface should be inspected after removal, and the bolt should be replaced if the serrations are worn or the locking performance cannot be confirmed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How Can Thread Galling Be Reduced on Stainless-Steel Flange Bolts?<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Keeping the threads clean, controlling installation speed, using a compatible anti-seize compound, and selecting an appropriate bolt-and-nut material combination can reduce adhesion and cold welding.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can a Flange Bolt Be Customized from an Old Sample Without a Drawing?<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A complete and not severely worn sample can be measured and modeled, but the material, heat treatment, thread standard, surface treatment, and service load still need to be confirmed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How Can Production Scale Up After Prototype Validation?<strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CNC machining can be used during the prototype stage to validate dimensions and assembly, after which a modified standard part, cold heading, forging, or thread rolling can be evaluated to reduce volume-production cost.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/07\/weldo-machining-packaging-center.webp\" alt=\"weldo machining packaging center\" class=\"wp-image-11938\" style=\"width:600px\" srcset=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/07\/weldo-machining-packaging-center.webp 800w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/07\/weldo-machining-packaging-center-300x300.webp 300w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/07\/weldo-machining-packaging-center-150x150.webp 150w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/07\/weldo-machining-packaging-center-768x768.webp 768w, https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/07\/weldo-machining-packaging-center-12x12.webp 12w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>","protected":false},"excerpt":{"rendered":"<p>What Is a Flange Bolt? If you are asking, \u201cWhat is a flange bolt?\u201d, it is a threaded fastener with an integral circular flange beneath its head. The flange increases the contact area with the workpiece, distributes clamping force more evenly, and often eliminates the need for a separate washer. Flange bolts are available with different bearing faces. A smooth flange helps protect coatings and precision-finished surfaces, while a serrated flange can resist loosening in vibration-prone assemblies where the serrations are permitted to bite into the mating surface. For procurement teams, identifying a flange bolt is only the first step. A complete specification should confirm the thread, flange geometry, material, [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":14361,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-14358","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/weldomachining.com\/ja\/wp-json\/wp\/v2\/posts\/14358","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/weldomachining.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/weldomachining.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/weldomachining.com\/ja\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/weldomachining.com\/ja\/wp-json\/wp\/v2\/comments?post=14358"}],"version-history":[{"count":2,"href":"https:\/\/weldomachining.com\/ja\/wp-json\/wp\/v2\/posts\/14358\/revisions"}],"predecessor-version":[{"id":14364,"href":"https:\/\/weldomachining.com\/ja\/wp-json\/wp\/v2\/posts\/14358\/revisions\/14364"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/weldomachining.com\/ja\/wp-json\/wp\/v2\/media\/14361"}],"wp:attachment":[{"href":"https:\/\/weldomachining.com\/ja\/wp-json\/wp\/v2\/media?parent=14358"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/weldomachining.com\/ja\/wp-json\/wp\/v2\/categories?post=14358"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/weldomachining.com\/ja\/wp-json\/wp\/v2\/tags?post=14358"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}