316 Stainless Steel Flat Washers - Marine-Grade Corrosion Resistance

316 stainless steel flat washers offer superior corrosion resistance compared to 304 grade, thanks to the addition of molybdenum, which provides enhanced protection against chlorides, seawater, and acidic environments. They are the preferred choice for marine, offshore, chemical processing, and pharmaceutical fastener applications.

Superior Washer & Gasket Corp manufactures 316 stainless steel flat washers in standard and custom sizes with ISO 9001:2015 certified quality management. We maintain inventory of 316 stainless washers for fast delivery and produce custom sizes to your dimensional requirements-all made in the U.S.A. with material certifications available.

316 stainless steel with molybdenum for superior chloride resistance
Preferred grade for marine and chemical applications
Standard and custom 316 stainless flat washer sizes
ISO 9001:2015 certified quality control
Made in the U.S.A.; material certifications available

Showing 201–250 of 477 products

SKU	ID	OD	Thickness	Material	ID TOL	OD TOL	Quantity
380-250-029	ID 0.269	OD 0.502	Thickness 0.029	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-251-059	ID 0.349	OD 0.687	Thickness 0.059	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-252-180	ID 0.828	OD 2.163	Thickness 0.18	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-253-036	ID 0.206	OD 0.5	Thickness 0.035	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-254-060	ID 0.268	OD 0.56	Thickness 0.059	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-255-047	ID 0.16	OD 0.562	Thickness 0.047	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-256-060	ID 0.269	OD 0.562	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-257-060	ID 0.331	OD 0.622	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-258-060	ID 0.284	OD 0.737	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-259-037	ID 0.205	OD 0.75	Thickness 0.037	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-26-051	ID 0.098	OD 0.301	Thickness 0.051	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-260-060	ID 0.268	OD 0.876	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-261-048	ID 0.346	OD 1.25	Thickness 0.048	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-262-120	ID 0.686	OD 1.747	Thickness 0.12	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-263-060	ID 0.348	OD 1.997	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-264-060	ID 0.407	OD 2.0	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-265-030	ID 0.347	OD 0.626	Thickness 0.03	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-266-060	ID 0.753	OD 0.998	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-267-020	ID 0.257	OD 0.376	Thickness 0.02	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-268-028	ID 0.143	OD 0.624	Thickness 0.028	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-269-040	ID 0.485	OD 0.709	Thickness 0.04	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-27-025	ID 0.1	OD 0.25	Thickness 0.025	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-270-060	ID 0.39	OD 1.0	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-271-003	ID 0.0	OD 1.304	Thickness 0.003	Material 316 Stainless Steel	ID TOL Not available	OD TOL +-.005	Quantity
380-272-040	ID 0.756	OD 1.312	Thickness 0.04	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-273-120	ID 1.557	OD 2.111	Thickness 0.12	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-274-100	ID 0.531	OD 1.25	Thickness 0.1	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-275-028	ID 0.189	OD 0.364	Thickness 0.028	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-276-050	ID 0.221	OD 0.628	Thickness 0.05	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-277-186	ID 0.561	OD 1.252	Thickness 0.186	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-278-110	ID 0.815	OD 2.0	Thickness 0.11	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-279-030	ID 0.204	OD 1.5	Thickness 0.03	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-28-050	ID 0.1	OD 0.31	Thickness 0.05	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-280-060	ID 0.379	OD 0.562	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-281-060	ID 0.532	OD 1.5	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-282-120	ID 0.281	OD 1.246	Thickness 0.12	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-283-120	ID 0.854	OD 1.246	Thickness 0.12	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-284-160	ID 0.815	OD 1.471	Thickness 0.16	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-285-100	ID 0.683	OD 1.748	Thickness 0.1	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-286-034	ID 0.178	OD 0.285	Thickness 0.034	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-287-060	ID 0.603	OD 0.784	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-288-060	ID 0.41	OD 0.812	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-289-030	ID 0.456	OD 0.939	Thickness 0.03	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-29-033	ID 0.109	OD 0.254	Thickness 0.033	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-290-048	ID 0.285	OD 1.0	Thickness 0.048	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-291-075	ID 0.658	OD 1.31	Thickness 0.075	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-294-060	ID 0.284	OD 0.627	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-295-103	ID 0.658	OD 1.247	Thickness 0.103	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-30-031	ID 0.121	OD 0.209	Thickness 0.031	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-303-117	ID 0.392	OD 1.001	Thickness 0.117	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity

316 Stainless Steel Flat Washer Frequently Asked Questions

Below are answers to some of the most common questions about 316 stainless steel flat washers.

What are 316 stainless steel flat washers?
316 stainless steel flat washers are manufactured from Type 316 austenitic stainless steel, which contains 2-3% molybdenum in addition to the nickel and chromium found in standard 304 stainless. The molybdenum addition provides significantly improved resistance to chloride pitting and crevice corrosion, making 316 the preferred stainless grade for marine, chemical processing, and coastal outdoor applications.

What is the difference between 304 and 316 stainless steel washers?
The key difference is chloride resistance. Standard 304 stainless can pit and crevice corrode in chloride-rich environments such as seawater, road salt, and some chemical processing streams. The molybdenum in 316 significantly increases resistance to chloride-induced corrosion. In freshwater and mild atmospheric environments, 304 performs comparably to 316. For saltwater, chemical processing, or high-chloride exposure, 316 is the correct choice.

What is 316L stainless steel and do you offer it?
316L is a low-carbon version of 316 stainless steel with a maximum carbon content of 0.03%, compared to 0.08% for standard 316. The lower carbon content reduces the risk of carbide precipitation in the heat-affected zone during welding. For washer applications not involving welding, 316 and 316L perform identically. Contact us if 316L is specifically required for your application.

Can you make custom 316 stainless steel flat washers?
Yes. Superior Washer manufactures custom 316 stainless steel washers to your OD, ID, and thickness specifications. Contact us via the Quick Quote form or by phone.

Are your 316 stainless steel flat washers made in the USA?
Yes. All 316 stainless steel flat washers are manufactured in the United States under our ISO 9001:2015 certified Quality Management System. Material certifications are available upon request.

Looking for a different corrosion resistance level? We also stock 301, 302, and 304 grades. Browse the full flat washers lineup to compare all stainless steel and other material options.