Custom Flange Parts

Custom Flange Parts Machining

CNC-machined flange parts for piping, valves, pumps and equipment interfaces. Share your drawing, material and inspection requirements for an engineering review.

Drawing review
Material selection
CNC Machining

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Flange Types and Design Options

Each type is shown with its typical connection role. Final selection depends on the applicable standard, pressure class, temperature and service medium.

Weld Neck

Transfers load through a tapered neck. Choose for high pressure, high temperature or cyclic service.

Slip-On

Slides over pipe for welded alignment. Choose for general low-to-medium pressure piping.

Blind

Seals a pipe or equipment opening. Choose for isolation, testing or future expansion.

Socket Weld

Seats small-bore pipe in a socket and welds in place. Choose for compact, rigid connections.

Lap Joint

Uses a loose flange over a stub end. Choose for alignment and frequent disassembly.

Threaded

Connects through internal threads without welding. Choose where welding is restricted and pressure is limited.

Orifice

Holds an orifice plate and pressure taps. Choose for flow-measurement assemblies.

Integral

Forms a rigid flange with the pipe or equipment body. Choose for high stiffness and integrated construction.

Connection fit
OD, thickness, bore and internal stepsFastener layout
Bolt circle, hole size and orientationSealing features
RF, FF, RTJ and special groovesMachining details
Threads, chamfers and counterbores

Common Flange Materials and Sealing Faces

Choose a material family, then confirm the grade, pressure class, temperature and sealing face against the drawing and service medium.

Aluminum

Common grades: 6061-T6, 6082-T6, 7075-T6
Key properties: Lightweight, easy to machine and resistant to atmospheric corrosion.
Pressure / temperature: Low to medium pressure; typically ambient to moderate temperature.
Sealing faces: FF and RF; use compatible soft or coated gaskets to avoid damage.
Typical environment: Lightweight equipment, ventilation and general industrial piping.

Stainless Steel

Common grades: 304, 304L, 316, 316L, 321
Key properties: High strength, cleanability and broad corrosion resistance.
Pressure / temperature: Medium to high pressure; ambient to elevated temperature by grade.
Sealing faces: FF, RF and RTJ; finish must match the gasket and service standard.
Typical environment: Chemical, medical, food, pharmaceutical and wet service.

Copper

Common grades: C101, C110, C122
Key properties: Excellent thermal and electrical conductivity with good machinability.
Pressure / temperature: Low to medium pressure; best for low to moderate temperatures.
Sealing faces: FF and RF; use gasket materials compatible with copper and the medium.
Typical environment: Cooling loops, heat exchangers, electrical and temperature-control systems.

Brass

Common grades: C360, C464, C693
Key properties: Free-cutting, wear-resistant and dimensionally stable.
Pressure / temperature: Low to medium pressure; ambient to moderate temperature service.
Sealing faces: FF and RF; confirm galvanic compatibility with mating parts.
Typical environment: Water, instruments, valves and non-aggressive fluid systems.

Bronze

Common grades: C932, C954, C958
Key properties: Good wear, sliding and seawater resistance.
Pressure / temperature: Low to medium pressure; ambient to moderate temperature service.
Sealing faces: FF, RF and RTJ when the grade and gasket are correctly matched.
Typical environment: Marine equipment, pumps, valves and water-bearing systems.

Carbon Steel

Common grades: A105, A350 LF2, C20, Q235
Key properties: High load capacity, broad availability and cost efficiency.
Pressure / temperature: Low to high pressure; temperature range depends on grade and standard.
Sealing faces: FF, RF and RTJ; select gasket and coating for corrosion control.
Typical environment: Industrial piping, power equipment and general structural connections.

Titanium

Common grades: Grade 2, Grade 5 (Ti-6Al-4V)
Key properties: High strength-to-weight ratio and strong chloride resistance.
Pressure / temperature: Medium to high pressure; ambient to elevated temperature by grade.
Sealing faces: FF, RF and RTJ; protect the finish and prevent galling during assembly.
Typical environment: Aerospace, marine, chemical and high-corrosion systems.

ABS

Common grades: ABS, flame-retardant ABS
Key properties: Lightweight, impact-resistant and economical.
Pressure / temperature: Low pressure and near-ambient temperature service.
Sealing faces: FF and RF with soft gaskets; avoid over-tightening.
Typical environment: Non-aggressive media, covers and light-duty piping.

PVC

Common grades: PVC-U, PVC-C
Key properties: Low weight with good acid, alkali and moisture resistance.
Pressure / temperature: Low to medium pressure; PVC-C supports higher temperatures than PVC-U.
Sealing faces: FF and RF with elastomeric gaskets and controlled bolt load.
Typical environment: Water treatment, drainage and ambient chemical piping.

POM / Delrin

Common grades: POM-C, POM-H
Key properties: Low friction, good wear resistance and dimensional stability.
Pressure / temperature: Low pressure; best at ambient or moderate temperatures.
Sealing faces: FF and RF with soft gaskets; keep contact stress even.
Typical environment: Low-friction connections and frequent-disassembly assemblies.

PTFE

Common grades: Virgin PTFE, glass-filled PTFE, filled PTFE
Key properties: Exceptional chemical resistance and very low friction.
Pressure / temperature: Low to medium pressure; broad chemical-service temperature range.
Sealing faces: FF, RF and lined faces with soft or PTFE-based gaskets.
Typical environment: Strong chemicals, process piping and special lining structures.

HDPE

Common grades: HDPE, PE100
Key properties: Tough, moisture-resistant and resistant to many chemicals.
Pressure / temperature: Low to medium pressure; ambient to moderate temperature.
Sealing faces: FF and RF with elastomeric gaskets; allow for creep and expansion.
Typical environment: Water treatment, chemical transfer and outdoor service.

PP

Common grades: PP-H, PP-R, PP-C
Key properties: Low density with strong resistance to water and chemicals.
Pressure / temperature: Low to medium pressure; ambient to moderate temperature by grade.
Sealing faces: FF and RF with soft gaskets and controlled compression.
Typical environment: Chemical lines, liquid transfer and humid service.

PEEK

Common grades: PEEK, glass-filled PEEK, carbon-filled PEEK
Key properties: High mechanical strength, chemical resistance and heat capability.
Pressure / temperature: Low to medium pressure; elevated temperature by grade and design.
Sealing faces: FF, RF and special lined faces with compatible high-performance gaskets.
Typical environment: Semiconductor, medical, aerospace and demanding industrial systems.

Nylon / PA

Common grades: PA6, PA66, reinforced nylon
Key properties: Lightweight, wear-resistant and impact-tolerant.
Pressure / temperature: Low pressure; ambient to moderate temperature with moisture allowance.
Sealing faces: FF and RF with soft gaskets; account for moisture-related expansion.
Typical environment: Lightweight, low-pressure and general wear applications.

PC

Common grades: PC, flame-retardant PC, transparent PC
Key properties: High impact strength, dimensional stability and transparency options.
Pressure / temperature: Low pressure; ambient to moderate temperature service.
Sealing faces: FF and RF with soft gaskets and low, even bolt load.
Typical environment: Inspection windows, transparent covers and lightweight structures.

PMMA

Common grades: Cast PMMA, extruded PMMA
Key properties: High optical clarity, weatherability and clean appearance.
Pressure / temperature: Low pressure and near-ambient temperature service.
Sealing faces: FF and RF with soft, non-abrasive gaskets.
Typical environment: Viewing windows and non-high-pressure transparent connections.

FF · Flat Face

RF · Raised Face

RTJ · Ring Type Joint

Male / Female

Tongue & Groove

Pressure and temperature suitability depend on grade, size, wall thickness, bolts, gasket and governing standard. Review the final selection with the drawing and operating conditions. See Surface Finish options.

6-Step CNC Flange Part Machining Process

The route is planned from the drawing, material, critical faces and inspection requirements. Production images can be added later.

Review & Program

Check standards, datums and generate the CNC toolpath.

Material & Heat Treat

Verify grade, stock condition and specified heat treatment.

Turn & Mill

Machine OD, bore, steps and sealing faces.

Drill & Groove

Produce bolt holes, threads, taps and RTJ grooves.

Finish & Deburr

Apply surface treatment, clean and protect critical faces.

Inspect & Document

Verify dimensions, finish and records before shipment.

Checking workpiece processing status — Process monitoring

Conventional milling process — Conventional Milling

Turn-mill compound machining center — Turn-mill machining

Electrical discharge machining — EDM machining

Flange Inspection and Documentation

Inspection records are prepared against the drawing when dimensional, material or traceability documentation is required.

CMM dimensional inspection — CMM inspection

Dimensional size testing — Dimensional testing

Optical projector inspection — Optical inspection

Hardness testing instrument — Hardness testing

Critical dimensions

OD, bore, thickness, bolt circle and hole position.

Sealing faces

Flatness, finish and groove condition are checked.

Material records

Grade, heat treatment and traceability documents when specified.

Release records

Inspection reports and test records can ship with the parts.

Selected Flange Work

CNC-Machined Flange Case Studies

A selection of flange components produced in copper, brass, stainless steel, aluminum and PEEK, with material-specific machining and finishing.

Red Copper Flange

Copper flange for thermal and electrical assemblies.

Brass Flanged Bushing

Threaded brass interface for instruments and fluid connections.

316L Flange Sleeve

Corrosion-resistant stainless component for process interfaces.

316 stainless steel machined flange plates

316 Flange Plates

Machined plates for chemical, water and equipment connections.

3.1325 Aluminum Bushing

Lightweight flanged bushing for equipment and motion assemblies.

6082-T6 aluminum flange with hard anodize

6082-T6 Hard-Anodized Flange

Wear-resistant aluminum flange for lightweight housings.

316 stainless steel machined flange component

316 Stainless Component

Stainless flange component for wet and corrosive environments.

PEEK Flange Component

High-performance polymer part for chemical and thermal service.

6061 Aluminum Flange

General-purpose aluminum flange for lightweight assemblies.

Custom Flange Component

Drawing-based part with controlled bores and bolt features.

Precision Flange Part

Machined interface prepared for fit-up and inspection.

Equipment Flange Part

Custom interface component for equipment integration.

Flange Manufacturing Capabilities

Our CNC machining route is reviewed from material, geometry, tolerance and sealing requirements. The ranges below are typical starting points, not fixed limits.

Metal Flanges

Typical tolerance: ±0.02 mm; tighter features reviewed to drawing
Diameter range: Approx. 10–1,000 mm
Minimum wall: Approx. 1.0 mm, subject to alloy and rigidity
Feature size: Smallest practical bore or hole about 2 mm
Surface / finish: Machined, anodized, plated, coated or passivated
Dispatch: Typical samples in 1–7 days after drawing approval

Plastic Flanges

Typical tolerance: ±0.05 mm; account for material shrinkage and creep
Diameter range: Approx. 10–600 mm
Minimum wall: Approx. 1.5 mm, subject to polymer and geometry
Feature size: Smallest practical bore or hole about 2–3 mm
Surface / finish: Machined, deburred, polished or chemically compatible finished
Dispatch: Typical samples in 1–7 days after drawing approval

Injection MoldingSheet Metal Stamping3D PrintingOvermolding

Final size, tolerance, wall thickness, material and lead time are confirmed after drawing review.

Custom Flange Parts for Your Application

Share your drawing and key requirements for a practical manufacturing review.

Oil & Gas

Chemical Processing

Water Treatment

Power Generation

Marine Equipment

Industrial Machinery

2D drawing or 3D CAD file
Material and material condition
Flange standard and pressure class
Sealing face, quantity and inspection requirements

Consult for a Quote

Flange Machining FAQ

Quick answers to common flange selection and measurement questions.

What Is a Flange?

A flange connects pipes, valves, pumps and other equipment with bolts and a gasket. It supports installation, inspection and removal.

How to Measure Flange Size?

Measure the outside diameter, bore, thickness, bolt circle, bolt-hole diameter and hole count. Compare them with the required standard and pressure class.

What Is a Blind Flange?

A blind flange is a solid flange without a center bore. It seals the end of a pipe, valve or vessel opening.

When Is a Flange Needed?

Use a flange when a secure, removable connection is needed for installation, maintenance or replacement.

What Do RF, FF and RTJ Mean?

RF is Raised Face, FF is Flat Face and RTJ is Ring Type Joint. Select the face by the flange standard, pressure, temperature, medium and gasket.