Metric Copper Washers - Sealing & Conductive Flat Washers

Metric copper washers are valued for their superior sealing performance, electrical conductivity, and corrosion resistance in metric fastener applications including hydraulic fittings, plumbing connections, and electrical assemblies. Superior Washer & Gasket Corp supplies metric copper washers in standard DIN and ISO sizes and produces custom metric copper sealing washers to your specifications.

As an ISO 9001:2015 certified metal washer manufacturer, we maintain inventory of metric copper washers for fast delivery and offer custom stamping for non-standard metric sizes. All products are made in the U.S.A. with complete material traceability.

Metric copper washers for hydraulic and sealing applications
DIN and ISO standard sizes in stock
Custom metric copper sealing washers available
ISO 9001:2015 certified manufacturing
Made in the U.S.A.

Showing 201–250 of 400 products

SKU	ID (MM)	OD (MM)	Thickness (MM)	Material	ID MM TOL	OD MM TOL	Quantity
175-2353	ID (MM) 10.008	OD (MM) 15.926	Thickness (MM) 1.524	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2354	ID (MM) 10.008	OD (MM) 17.45	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2355	ID (MM) 10.008	OD (MM) 19.075	Thickness (MM) 1.6	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2356	ID (MM) 10.033	OD (MM) 14.046	Thickness (MM) 1.549	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2357	ID (MM) 10.058	OD (MM) 25.375	Thickness (MM) 1.6	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2358	ID (MM) 10.084	OD (MM) 15.977	Thickness (MM) 1.626	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2359	ID (MM) 10.16	OD (MM) 13.818	Thickness (MM) 0.787	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2360	ID (MM) 10.16	OD (MM) 15.037	Thickness (MM) 2.007	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2361	ID (MM) 10.16	OD (MM) 16.027	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2362	ID (MM) 10.211	OD (MM) 19.05	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2363	ID (MM) 10.262	OD (MM) 15.875	Thickness (MM) 1.6	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2364	ID (MM) 10.338	OD (MM) 15.9	Thickness (MM) 0.787	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2365	ID (MM) 10.338	OD (MM) 19.05	Thickness (MM) 3.2	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2366	ID (MM) 10.363	OD (MM) 19.05	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2367	ID (MM) 10.363	OD (MM) 25.451	Thickness (MM) 1.27	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2368	ID (MM) 10.389	OD (MM) 15.824	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2369	ID (MM) 10.414	OD (MM) 15.9	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2370	ID (MM) 10.414	OD (MM) 16.84	Thickness (MM) 1.295	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2371	ID (MM) 10.414	OD (MM) 18.999	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2372	ID (MM) 10.414	OD (MM) 20.625	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2373	ID (MM) 10.414	OD (MM) 25.375	Thickness (MM) 1.549	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2374	ID (MM) 10.439	OD (MM) 19.075	Thickness (MM) 3.15	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2375	ID (MM) 10.49	OD (MM) 18.821	Thickness (MM) 1.651	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2376	ID (MM) 10.643	OD (MM) 19.812	Thickness (MM) 2.032	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2377	ID (MM) 10.77	OD (MM) 15.672	Thickness (MM) 0.381	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2378	ID (MM) 11.1	OD (MM) 13.513	Thickness (MM) 1.422	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2379	ID (MM) 11.1	OD (MM) 15.875	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2380	ID (MM) 11.1	OD (MM) 19.025	Thickness (MM) 0.787	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2381	ID (MM) 11.1	OD (MM) 28.499	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2382	ID (MM) 11.151	OD (MM) 20.676	Thickness (MM) 1.651	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2383	ID (MM) 11.176	OD (MM) 16.662	Thickness (MM) 1.6	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2384	ID (MM) 11.176	OD (MM) 17.399	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2385	ID (MM) 11.176	OD (MM) 17.45	Thickness (MM) 0.787	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2386	ID (MM) 11.176	OD (MM) 19.05	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2387	ID (MM) 11.201	OD (MM) 13.538	Thickness (MM) 1.473	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2388	ID (MM) 11.201	OD (MM) 19.05	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2389	ID (MM) 11.227	OD (MM) 15.697	Thickness (MM) 0.508	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2390	ID (MM) 11.252	OD (MM) 13.36	Thickness (MM) 1.626	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2391	ID (MM) 11.43	OD (MM) 18.999	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2392	ID (MM) 11.455	OD (MM) 18.974	Thickness (MM) 0.787	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2393	ID (MM) 11.455	OD (MM) 19.025	Thickness (MM) 1.295	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2394	ID (MM) 11.582	OD (MM) 22.2	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2395	ID (MM) 11.582	OD (MM) 22.25	Thickness (MM) 0.787	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2396	ID (MM) 11.608	OD (MM) 15.088	Thickness (MM) 1.549	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2397	ID (MM) 11.608	OD (MM) 15.875	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2398	ID (MM) 11.608	OD (MM) 22.047	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2399	ID (MM) 11.862	OD (MM) 15.85	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2400	ID (MM) 11.887	OD (MM) 15.951	Thickness (MM) 1.016	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2401	ID (MM) 11.913	OD (MM) 18.999	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2402	ID (MM) 11.913	OD (MM) 25.273	Thickness (MM) 1.6	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity

Metric Copper Washer Frequently Asked Questions

Below are answers to some of the most common questions about metric copper washers.

What are metric copper washers?
Metric copper washers are flat sealing and conductive washers dimensioned in millimeters for use with metric fasteners. Superior Washer manufactures metric copper washers to DIN and ISO standard sizes and custom metric dimensions, with over 400 configurations in stock. Copper's softness and malleability make metric copper washers ideal for creating leak-proof seals in metric hydraulic fittings, plumbing connections, and fuel systems.

What are metric copper washers used for?
Metric copper washers are most commonly used as crush or sealing washers in metric hydraulic fittings, drain plugs, banjo bolt connections, and plumbing joints where a leak-proof metal-to-metal seal is required. They are also used in electrical assemblies as conductive spacers and in applications requiring a soft, non-galling interface between metric fasteners and mating surfaces.

What size range are your metric copper washers available in?
Our metric copper catalog covers ID sizes from approximately 1.9 mm through 20.7 mm and OD sizes from approximately 3.9 mm through 38.2 mm, in thicknesses from 0.127 mm through 3.28 mm. This range supports common metric hydraulic and plumbing fitting sizes across M3 through M20 and beyond.

Can you produce custom metric copper washers?
Yes. We manufacture custom metric copper sealing washers to your exact millimeter OD, ID, and thickness specifications. Contact us via the Quick Quote form or call NY (631) 273-8282 or SC (803) 366-3250.

Are your metric copper washers made in the USA?
Yes. All metric copper washers are manufactured in the United States under our ISO 9001:2015 certified Quality Management System with full material traceability. Material certifications are available upon request.

Need copper in imperial sizing instead? We also stock copper and other materials in SAE and USS dimensions. Browse the full flat washers catalog to compare all sizing and material options.