Copper Machining

Copper is a highly conductive metal commonly used for electrical connectors, terminals, ports, and electronic interface components.

Common copper material

Different copper grades provide varying levels of conductivity, strength, corrosion resistance, and machinability for diverse industrial applications.

Brass Grade	特徴	代表的なアプリケーション
C36000 (C3604)	Excellent machinability and dimensional stability	Precision CNC parts, fittings, connectors
C37700	Good strength and forging performance	Valves, plumbing fittings, hardware
C26000	High ductility and corrosion resistance	Electrical terminals, connectors, fasteners
H59	High strength and good machinability	Brass nuts, valves, mechanical components
H62	Good ductility and corrosion resistance	Electrical parts, precision machined components
CW614N (CZ121)	Free-cutting brass with excellent chip control	Threaded parts, fittings, precision CNC components

Property of Copper material

Density: 8.90–8.96 g/cm³
Copper has a high density, giving machined parts good stability and a solid structure for connectors, terminals, and busbars.

Electrical Conductivity: 80–101% IACS
Copper offers excellent conductivity, making it ideal for terminals, contact pins, electronic ports, and power transmission parts.

Thermal Conductivity: 300–401 W/m·K
Copper transfers heat quickly, so it is widely used for heat sinks, cooling plates, and thermal management components.

Hardness: 40–110 HB
Copper has moderate hardness, balancing machinability, formability, wear resistance, and dimensional stability.

Tensile Strength: 200–360 MPa
Copper provides enough strength for moderate loads while keeping good ductility for precision machined parts.

Yield Strength: 50–300 MPa
Higher yield strength helps copper parts resist permanent deformation in terminals, clips, busbars, and conductive structures.

Elongation: 15–50%
Good elongation allows copper parts to withstand bending, stamping, crimping, and assembly without cracking easily.

表面処理

Copper parts can be finished with polishing, plating, and anti-oxidation treatments to improve conductivity, solderability, corrosion resistance, wear resistance, and appearance.

表面処理	主な機能	一般的なアプリケーション
機械研磨	Improves brightness and removes machining marks	Decorative parts, small copper parts
化学研磨	Cleans and brightens complex surfaces	Batch parts, irregular copper parts
電解研磨	Creates a smoother and brighter finish	Precision parts, high-end components
Passivation / Anti-oxidation	Reduces oxidation, darkening, and verdigris	Conductive parts, electronic components
Tin Plating	Improves solderability and oxidation resistance	Terminals, connectors, electronic interfaces
ニッケルめっき	Enhances corrosion resistance, wear resistance, and hardness	Mechanical copper parts, connectors
Silver Plating	Improves conductivity and contact stability	Contacts, terminals, precision connectors
Gold Plating	Provides excellent oxidation resistance and stable conductivity	High-end electronic contacts and interfaces
ブラッシング	Creates a matte or satin surface texture	Panels, decorative copper parts
パウダーコーティング	Adds color and surface protection	Housings, decorative structural parts