Copper Washers
Copper washers are circular flat discs made from copper or copper alloy materials. They are commonly used as fasteners, spacers, and sealing elements in a variety of applications.
| Standard | Size | Inside Diameter (ID) | Outside Diameter (OD) | Thickness |
|---|---|---|---|---|
| BS 4320 Copper washers | M3 | 3.2 mm | 7 mm | 0.5 mm |
| M4 | 4.3 mm | 9 mm | 0.8 mm | |
| M5 | 5.3 mm | 10 mm | 1.0 mm | |
| M6 | 6.4 mm | 12 mm | 1.2 mm | |
| M8 | 8.4 mm | 16 mm | 1.6 mm | |
| M10 | 10.5 mm | 20 mm | 2.0 mm | |
| M12 | 12.5 mm | 24 mm | 2.5 mm | |
| M16 | 16.5 mm | 30 mm | 3.0 mm | |
| M20 | 20.5 mm | 37 mm | 3.0 mm | |
| DIN 125 Copper washers | M3 | 3.2 mm | 7 mm | 0.5 mm |
| M4 | 4.3 mm | 9 mm | 0.8 mm | |
| M5 | 5.3 mm | 10 mm | 1.0 mm | |
| M6 | 6.4 mm | 12 mm | 1.6 mm | |
| M8 | 8.4 mm | 16 mm | 2.0 mm | |
| M10 | 10.5 mm | 20 mm | 2.5 mm | |
| M12 | 12.5 mm | 24 mm | 3.0 mm | |
| M16 | 16.5 mm | 30 mm | 3.0 mm | |
| M20 | 20.5 mm | 37 mm | 4.0 mm | |
| ASTM F844 Copper washers | #6 | 3.2 mm | 12.7 mm | 1.6 mm |
| #8 | 4.3 mm | 15.9 mm | 2.0 mm | |
| #10 | 5.5 mm | 19.1 mm | 2.5 mm | |
| 1/4″ | 6.4 mm | 22.2 mm | 3.2 mm | |
| 5/16″ | 8.0 mm | 25.4 mm | 3.2 mm | |
| 3/8″ | 9.5 mm | 28.6 mm | 3.2 mm | |
| 1/2″ | 12.7 mm | 37.3 mm | 4.8 mm | |
| 5/8″ | 15.9 mm | 44.5 mm | 4.8 mm | |
| 3/4″ | 19.1 mm | 50.8 mm | 4.8 mm |
Manufacturing Methods: Copper washers are typically produced through stamping/punching or machining processes. Stamping involves cutting discs from copper sheets or coils, while machining involves cutting washers from solid copper bars or rods.
Standards and Specifications: Copper washers are manufactured to conform to several international standards, including:
- DIN 125 (Germany): Washers for Bolts and Screws
- ASTM F844 (USA): Washers, Steel, Plain (Flat), Unhardened for General Use
- BS 4320 (UK): Metal Washers for General Engineering Purposes
Dimensional Ranges:
- Inside Diameter (ID): 3mm to 100mm
- Outside Diameter (OD): 6mm to 115mm
- Thickness: 0.5mm to 6.0mm
Typical Usage: Copper washers find application in various industries and equipment, including:
- Electrical and electronics: Providing grounding, insulation, and vibration resistance in electrical enclosures, junction boxes, and circuit boards.
- Plumbing and HVAC: Sealing fittings, valves, and pipe connections in water, gas, and refrigerant systems.
- Automotive: Used as gaskets, insulators, and vibration damping components in engines, transmissions, and chassis.
- Construction: Facilitating weatherproofing and corrosion resistance in roofing, siding, and exterior fastening applications.
- General engineering: Distributing load, preventing loosening, and compensating for uneven surfaces in machinery, equipment, and structures.
The excellent electrical and thermal conductivity, corrosion resistance, and ease of fabrication make copper washers a versatile choice for a wide range of industrial, commercial, and consumer applications.