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 1–50 of 477 products

SKU	ID	OD	Thickness	Material	ID TOL	OD TOL	Quantity
300-292-120	ID 1.285	OD 1.737	Thickness 0.12	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
300-293-164	ID 1.387	OD 2.495	Thickness 0.164	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-10-029	ID 0.0	OD 0.37	Thickness 0.029	Material 316 Stainless Steel	ID TOL Not available	OD TOL +-.005	Quantity
380-100-030	ID 0.23	OD 0.328	Thickness 0.03	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-101-036	ID 0.234	OD 0.437	Thickness 0.036	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-102-037	ID 0.234	OD 0.562	Thickness 0.037	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-102-047	ID 0.234	OD 0.562	Thickness 0.047	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-103-014	ID 0.245	OD 0.345	Thickness 0.014	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-104-020	ID 0.254	OD 0.325	Thickness 0.02	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-105-020	ID 0.254	OD 0.5	Thickness 0.02	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-106-057	ID 0.254	OD 0.56	Thickness 0.057	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-107-065	ID 0.254	OD 0.563	Thickness 0.065	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-108-060	ID 0.254	OD 0.812	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-109-056	ID 0.254	OD 1.0	Thickness 0.056	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-11-105	ID 0.0	OD 0.776	Thickness 0.105	Material 316 Stainless Steel	ID TOL Not available	OD TOL +-.005	Quantity
380-110-018	ID 0.261	OD 1.0	Thickness 0.018	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-111-031	ID 0.267	OD 0.375	Thickness 0.031	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-112-031	ID 0.267	OD 0.5	Thickness 0.031	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-112-050	ID 0.267	OD 0.5	Thickness 0.05	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-113-059	ID 0.267	OD 0.501	Thickness 0.059	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-114-031	ID 0.268	OD 0.405	Thickness 0.031	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-115-031	ID 0.268	OD 0.437	Thickness 0.031	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-116-049	ID 0.268	OD 0.469	Thickness 0.049	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-117-050	ID 0.268	OD 0.576	Thickness 0.05	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-118-031	ID 0.269	OD 0.624	Thickness 0.031	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-119-047	ID 0.269	OD 0.687	Thickness 0.047	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-12-095	ID 0.0	OD 0.777	Thickness 0.095	Material 316 Stainless Steel	ID TOL Not available	OD TOL +-.005	Quantity
380-120-062	ID 0.281	OD 0.5	Thickness 0.062	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-121-063	ID 0.281	OD 0.592	Thickness 0.063	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-122-031	ID 0.281	OD 0.625	Thickness 0.031	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-122-040	ID 0.281	OD 0.625	Thickness 0.04	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-123-031	ID 0.281	OD 0.687	Thickness 0.031	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-124-062	ID 0.281	OD 0.736	Thickness 0.062	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-125-031	ID 0.281	OD 0.875	Thickness 0.031	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-125-062	ID 0.281	OD 0.875	Thickness 0.062	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-126-030	ID 0.281	OD 0.937	Thickness 0.03	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-126-040	ID 0.281	OD 0.937	Thickness 0.04	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-126-060	ID 0.281	OD 0.937	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-127-062	ID 0.281	OD 1.0	Thickness 0.062	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-128-061	ID 0.281	OD 1.251	Thickness 0.061	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-129-031	ID 0.285	OD 0.515	Thickness 0.031	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-13-075	ID 0.0	OD 1.312	Thickness 0.075	Material 316 Stainless Steel	ID TOL Not available	OD TOL +-.005	Quantity
380-130-040	ID 0.285	OD 0.625	Thickness 0.04	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-131-030	ID 0.29	OD 0.625	Thickness 0.03	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-132-062	ID 0.299	OD 0.591	Thickness 0.062	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-133-052	ID 0.306	OD 0.625	Thickness 0.052	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-133-062	ID 0.306	OD 0.625	Thickness 0.062	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-134-030	ID 0.315	OD 0.407	Thickness 0.03	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-135-031	ID 0.315	OD 0.5	Thickness 0.031	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-135-091	ID 0.315	OD 0.5	Thickness 0.091	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.