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Copper CNC Machining Services from China: High-Quality Suppliers and Reliable Factory Solutions
We stock a wide range of high-purity coppers and key copper alloys, enabling optimal selection for conductivity, machinability, strength, and wear resistance.
Copper 101 / C110 — Oxygen-Free Electronic Copper
Highest Purity
The purest commercially available grade (99.99% Cu). Offers exceptional electrical and thermal conductivity. Primarily used for high-frequency conductors, waveguides, vacuum components, and other critical electronic applications where high purity is essential.
Copper C110 — Electrolytic Tough Pitch Copper
Most Common
The most common and widely used copper (99.9% Cu). Provides excellent electrical conductivity and formability. The standard choice for electrical components, busbars, connectors, and general conductive parts.
Copper C932 — SAE 660 High-Leaded Tin Bronze
Bearing Grade
A bearing bronze with excellent machinability, good anti-galling properties, and high load capacity. Ideal for bushings, bearings, thrust washers, and other applications requiring low friction and wear resistance against steel.
Copper 260 — Cartridge Brass (C26000)
70/30 Brass
A classic 70/30 brass with superb cold-working properties, good strength, and excellent corrosion resistance. Widely used for plumbing components, electrical sockets, connectors, decorative hardware, and custom machined parts requiring a balance of formability and durability.
Copper 360 — Free-Cutting Brass (C36000)
Best Machinability
Known as the standard for machinability among copper alloys. Offers high-speed machining capabilities, producing small, broken chips and excellent surface finishes. The preferred choice for high-volume production of complex parts like gears, fittings, valves, and screw machine components.
Frequently Asked Questions
Q
What is the difference between Copper 101 and Copper C110 (ETP)?
Copper 101 (Oxygen-Free Electronic, OFE) is the purest grade at 99.99% copper and is virtually free of oxygen, making it ideal for vacuum and high-frequency electronic applications. Copper C110 (Electrolytic Tough Pitch, ETP) is 99.9% copper and is the most widely used grade for general electrical and conductive applications. Both offer excellent conductivity, but C101 is preferred where maximum purity and oxygen-free properties are critical.
Q
Which copper alloy is best for high-volume CNC machining?
Copper 360 (Free-Cutting Brass, C36000) is the top choice for high-volume CNC machining. It is widely regarded as the benchmark for machinability among all copper alloys, enabling high-speed cutting, excellent surface finishes, and the production of small, broken chips that protect tooling and improve efficiency.
Q
What makes Copper C932 (SAE 660) suitable for bearing applications?
Copper C932 is a high-leaded tin bronze specifically engineered for bearing and bushing applications. Its lead content provides inherent lubrication, excellent anti-galling properties, and high load-bearing capacity. It performs reliably under conditions of low friction and wear, particularly when mating with steel shafts or surfaces.
Q
Is Copper 260 (Cartridge Brass) suitable for decorative and plumbing applications?
Yes. Copper 260 (C26000) is a classic 70/30 brass that combines superb cold-working formability with good strength and excellent corrosion resistance. These properties make it a popular choice for decorative hardware, plumbing fittings, electrical sockets, and custom machined parts where both aesthetics and durability are important.
Q
How do I choose the right copper alloy for my project?
The right copper alloy depends on your application's primary requirements. If maximum electrical or thermal conductivity is needed, choose C101 or C110. For ease of machining in high-volume production, C360 is the standard. If your part will function as a bearing or bushing, C932 offers the best wear performance. For parts requiring a balance of strength, formability, and corrosion resistance, C260 is an excellent all-around option. Our team can help you identify the optimal material for your specific needs.
Q
Can custom copper alloy parts be machined to tight tolerances?
Yes. Copper alloys, especially free-cutting grades like C360 and bearing bronzes like C932, machine exceptionally well and can be produced to tight dimensional tolerances. Advanced CNC machining processes allow for complex geometries, fine surface finishes, and consistent repeatability — making copper alloys suitable for precision components across electronics, automotive, aerospace, and industrial sectors.
Finishes and Post-Processing Options
The zinc alloy substrate is highly suitable for various surface treatments to enhance decoration, protection, or functionality:
Electroplating: Such as chrome, nickel, gold, or silver plating, providing a highly decorative appearance, excellent wear and corrosion resistance. This is the most common choice.
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Passivation or Chromate Conversion Coating:
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Powder Coating:
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Painting:
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Physical Vapor Deposition (PVD):
Design and Machining Considerations
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Process Selection:
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Design Considerations:
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Material Selection:
Zamak 3 and 5 are suitable for the vast majority of general-purpose parts requiring good appearance and strength; ZA-8 is better for wear and bearing applications; for making rapid tooling, choose specialized alloys like Kirksite.
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