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Copper Flat Washers - Sealing & Conductive Washers
Copper flat washers are valued for their excellent electrical conductivity, thermal performance, and natural sealing properties-making them a preferred choice for hydraulic fittings, electrical connections, and high-temperature applications. Superior Washer & Gasket Corp manufactures copper washers in standard and custom sizes from quality copper stock.
Our ISO 9001:2015 certified facility produces copper flat washers and copper sealing washers from stock inventory and to custom OD, ID, and thickness specifications. All metal washers are made in the U.S.A. with material certifications available for regulated applications.
- Superior electrical conductivity and thermal properties
- Excellent natural sealing performance
- Standard and custom copper flat washer sizes
- ISO 9001:2015 certified quality assurance
- Made in the U.S.A.; certifications available
Description
Copper Flat Washer Frequently Asked Questions
Below are answers to some of the most common questions about copper flat washers.
What are copper flat washers?
Copper flat washers are soft, malleable metal washers manufactured from Copper Alloy 110 (electrolytic tough pitch copper). Their softness makes them ideal for sealing applications where the washer must deform slightly to conform to the mating surface, such as in hydraulic fittings, fuel line connections, and plumbing joints. Superior Washer manufactures copper washers in standard and custom sizes under an ISO 9001:2015 certified QMS.
What are copper flat washers used for?
Copper washers are most commonly used as crush or sealing washers in oil drain plugs, hydraulic fittings, fuel systems, and plumbing connections. When torqued, the soft copper deforms and creates a leak-proof metal-to-metal seal. They are also used as electrical conductors and in applications requiring a soft, sacrificial interface between dissimilar metals.
What copper alloy do you use?
Superior Washer copper flat washers are manufactured from Copper Alloy 110 (C11000), also known as electrolytic tough pitch (ETP) copper. It offers excellent electrical conductivity, thermal conductivity, and malleability.
Can you make custom copper flat washers?
Yes. We produce custom copper washers to your exact OD, ID, and thickness specifications. Contact us via the Quick Quote form or by phone for prototype and production quantities.
Are your copper flat washers made in the USA?
Yes. All copper flat washers are manufactured in the United States under our ISO 9001:2015 certified Quality Management System. Material certifications are available upon request.
Copper is just one of the many materials we work with, our full catalog covers metals and plastics for nearly every application. Browse the complete flat washers selection to see what's available.