Ad
Metal Washer Spec Table
Metal Washer Specifications — 8 sizes
A metal washer (copper, brass, etc.) used where sealing or heat conduction is required.
Practical Notes
- Annealing copper washers (600–700°C) before use in hydraulic fitting sealing greatly improves seal performance.
- Must anneal before each reuse. Once-tightened copper washers are work-hardened and lose sealing ability.
Selection Guide
Copper/brass washers for electrical conduction, sealing, or high-temperature use. Copper washers are essential for hydraulic fitting seals; annealing before use improves sealing. Alternative to nylon/rubber in high-temperature (~400°C) environments.
Metal Washer
8 sizes| Nominal | d1 (Inner) | d2 (Outer) | h (Thick) | Type | Material |
|---|---|---|---|---|---|
| M3 | 3.2 | 7 | 0.5 | Metal Washer | Copper |
| M4 | 4.3 | 9 | 1 | Metal Washer | Copper |
| M5 | 5.3 | 10 | 1 | Metal Washer | Copper |
| M6 | 6.4 | 12 | 1.5 | Metal Washer | Copper |
| M8 | 8.4 | 16 | 1.5 | Metal Washer | Copper |
| M10 | 10.5 | 20 | 2 | Metal Washer | Copper |
| M12 | 13 | 24 | 2 | Metal Washer | Copper |
| M16 | 17 | 30 | 2 | Metal Washer | Aluminum |
Key Features
- Copper, brass, or phosphor bronze material ensures electrical conductivity for grounding paths
- Soft metal property enables dual use as sealing washer
- Maintains elasticity at high temperatures (~400 °C); replaces nylon/rubber washers
Key Applications
Electrical grounding connections, hydraulic fitting seals (copper washer), high-temp piping, transformer terminals, boiler flanges
FAQ
How to anneal copper washers?
Heat to 600–700°C then quench in water. Annealing softens copper for conformity to sealing surfaces. Must anneal before each reuse.