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 101–150 of 400 products

SKU	ID (MM)	OD (MM)	Thickness (MM)	Material	ID MM TOL	OD MM TOL	Quantity
175-2253	ID (MM) 6.604	OD (MM) 15.926	Thickness (MM) 3.2	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2254	ID (MM) 6.629	OD (MM) 9.144	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2255	ID (MM) 6.655	OD (MM) 15.723	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2256	ID (MM) 6.68	OD (MM) 11.125	Thickness (MM) 1.016	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2257	ID (MM) 6.706	OD (MM) 14.275	Thickness (MM) 1.016	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2258	ID (MM) 6.706	OD (MM) 14.351	Thickness (MM) 1.016	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2259	ID (MM) 6.756	OD (MM) 9.449	Thickness (MM) 0.838	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2260	ID (MM) 6.756	OD (MM) 9.525	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2261	ID (MM) 6.782	OD (MM) 11.1	Thickness (MM) 0.762	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2262	ID (MM) 6.807	OD (MM) 9.55	Thickness (MM) 1.245	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2263	ID (MM) 6.807	OD (MM) 12.624	Thickness (MM) 0.762	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2264	ID (MM) 6.833	OD (MM) 12.598	Thickness (MM) 1.27	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2265	ID (MM) 7.112	OD (MM) 11.024	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2266	ID (MM) 7.188	OD (MM) 12.675	Thickness (MM) 1.6	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2267	ID (MM) 7.188	OD (MM) 22.149	Thickness (MM) 1.6	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2268	ID (MM) 7.214	OD (MM) 11.151	Thickness (MM) 0.584	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2269	ID (MM) 7.214	OD (MM) 15.875	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2270	ID (MM) 7.214	OD (MM) 17.399	Thickness (MM) 0.838	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2271	ID (MM) 7.264	OD (MM) 12.649	Thickness (MM) 0.762	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2272	ID (MM) 7.366	OD (MM) 11.024	Thickness (MM) 1.016	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2273	ID (MM) 7.366	OD (MM) 12.725	Thickness (MM) 1.016	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2274	ID (MM) 7.747	OD (MM) 10.973	Thickness (MM) 1.27	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2275	ID (MM) 7.747	OD (MM) 15.621	Thickness (MM) 3.175	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2276	ID (MM) 7.925	OD (MM) 12.725	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2277	ID (MM) 7.925	OD (MM) 12.725	Thickness (MM) 1.016	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2278	ID (MM) 7.95	OD (MM) 11.43	Thickness (MM) 0.991	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2279	ID (MM) 7.95	OD (MM) 12.675	Thickness (MM) 1.549	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2280	ID (MM) 7.95	OD (MM) 15.875	Thickness (MM) 2.388	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2281	ID (MM) 7.95	OD (MM) 32.309	Thickness (MM) 2.032	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2282	ID (MM) 7.976	OD (MM) 12.979	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2283	ID (MM) 7.976	OD (MM) 14.275	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2284	ID (MM) 7.976	OD (MM) 19.05	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2285	ID (MM) 8.001	OD (MM) 10.236	Thickness (MM) 0.457	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2286	ID (MM) 8.001	OD (MM) 11.455	Thickness (MM) 0.66	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2287	ID (MM) 8.001	OD (MM) 11.862	Thickness (MM) 1.6	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2288	ID (MM) 8.001	OD (MM) 12.319	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2289	ID (MM) 8.001	OD (MM) 12.7	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2290	ID (MM) 8.026	OD (MM) 12.548	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2291	ID (MM) 8.026	OD (MM) 19.05	Thickness (MM) 1.295	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2292	ID (MM) 8.052	OD (MM) 11.862	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2293	ID (MM) 8.052	OD (MM) 14.275	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2294	ID (MM) 8.052	OD (MM) 14.275	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2295	ID (MM) 8.052	OD (MM) 15.824	Thickness (MM) 1.549	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2296	ID (MM) 8.052	OD (MM) 17.45	Thickness (MM) 1.651	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2297	ID (MM) 8.077	OD (MM) 10.338	Thickness (MM) 0.483	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2298	ID (MM) 8.128	OD (MM) 13.513	Thickness (MM) 0.813	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2299	ID (MM) 8.128	OD (MM) 19.025	Thickness (MM) 1.626	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2300	ID (MM) 8.153	OD (MM) 12.573	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2301	ID (MM) 8.179	OD (MM) 13.97	Thickness (MM) 1.575	Material Copper	ID MM TOL 0.127	OD MM TOL 0.127	Quantity
175-2302	ID (MM) 8.204	OD (MM) 12.7	Thickness (MM) 0.787	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.