Copper Washers
Copper washers are precision-engineered components designed to provide both load distribution and sealing in mechanical assemblies. Their soft, malleable nature allows them to deform under pressure, creating a tight, leak-proof seal while protecting the fastener and mating surface from damage. Copper's excellent thermal and electrical conductivity, corrosion resistance and resistance to galling make these washers ideal for high-pressure, hydraulic, plumbing and automotive applications where reliability and durability are critical.
Manufactured to precise standards such as DIN 125A, copper washers are fully compatible with a wide range of fasteners. The standard ensures that the outside diameter is typically twice the inside diameter, providing consistent performance across applications.
When Would Copper Washers Be Used?
Copper washers are ideal for sealing and high-pressure applications. Due to their softness and corrosion resistance, they can deform slightly under pressure to create a tight seal between the fixing and mating surface. This makes them perfect for applications where leak prevention is critical.
Common uses include:
- Hydraulic systems – pumps, valves, and cylinders
- Plumbing and fluid fittings – preventing leaks under pressure
- Automotive and machinery components – gaskets and high-pressure joints
Why Choose Copper Washers?
Copper washers combine strength, flexibility, and corrosion resistance, making them a reliable choice for both industrial and high-performance applications. Their ability to conform to surfaces ensures a secure, leak-proof seal every time.
How Do Copper Washers Compare to Other Materials?
Compared to steel or aluminium washers, copper washers are softer and more malleable, providing superior sealing performance in dynamic or high-pressure environments. They are especially effective where corrosion resistance and long-term reliability are required.
If you need assistance selecting the right washer or would like to discuss custom options, contact our expert team at 01233 713581.
Frequently Asked Questions
Copper washers are used to create a tight, leak-proof seal in applications such as brake lines, fuel systems and plumbing. They are soft and compress slightly when tightened, forming a seal between surfaces while also offering good corrosion resistance and heat tolerance.
Copper washers are used to create a tight, pressure resistant seal in plumbing, hydraulic and automotive systems, particularly around banjo bolts and fluid connections where a reliable, leak-proof joint is required.
Generally, no, copper washers are not meant to be reused.
They are designed to compress and deform to create a seal, especially in hydraulic and brake systems. Once crushed, they may not seal properly again unless they are annealed (re-softened), but replacement is always recommended for safety-critical applications.
Copper washers seal by deforming slightly when tightened.
Because copper is soft, it compresses under the bolt or nut, filling small surface gaps and creating a tight, leak proof seal between the two mating surfaces.
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