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 301–350 of 477 products

SKU	ID	OD	Thickness	Material	ID TOL	OD TOL	Quantity
380-357-162	ID 0.681	OD 2.246	Thickness 0.162	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-358-058	ID 0.267	OD 0.558	Thickness 0.058	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-359-071	ID 0.283	OD 0.626	Thickness 0.071	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-36-003	ID 0.126	OD 0.246	Thickness 0.003	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-36-015	ID 0.126	OD 0.246	Thickness 0.015	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-360-147	ID 0.94	OD 1.748	Thickness 0.147	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-361-162	ID 0.941	OD 1.753	Thickness 0.162	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-362-058	ID 0.151	OD 0.308	Thickness 0.058	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-363-020	ID 0.207	OD 0.372	Thickness 0.02	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-364-029	ID 0.205	OD 0.437	Thickness 0.029	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-365-058	ID 0.472	OD 0.798	Thickness 0.058	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-366-087	ID 0.659	OD 1.31	Thickness 0.087	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-367-097	ID 0.816	OD 1.379	Thickness 0.097	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-368-029	ID 0.284	OD 0.531	Thickness 0.029	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-369-020	ID 0.063	OD 0.131	Thickness 0.02	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-37-015	ID 0.127	OD 0.312	Thickness 0.015	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-370-046	ID 0.092	OD 0.245	Thickness 0.046	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-371-185	ID 0.566	OD 1.694	Thickness 0.185	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-372-117	ID 0.409	OD 1.248	Thickness 0.117	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-373-117	ID 0.642	OD 1.5	Thickness 0.117	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-374-047	ID 0.222	OD 0.502	Thickness 0.047	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-375-073	ID 0.654	OD 1.308	Thickness 0.073	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-376-118	ID 1.0	OD 1.499	Thickness 0.118	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-377-103	ID 1.068	OD 1.754	Thickness 0.103	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-378-060	ID 0.706	OD 1.06	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-379-030	ID 0.358	OD 0.75	Thickness 0.03	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-38-030	ID 0.128	OD 0.25	Thickness 0.03	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-380-016	ID 0.449	OD 0.748	Thickness 0.016	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-381-057	ID 0.471	OD 0.922	Thickness 0.057	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-382-173	ID 0.564	OD 1.699	Thickness 0.173	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-383-022	ID 0.392	OD 1.744	Thickness 0.022	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-384-029	ID 0.519	OD 1.937	Thickness 0.029	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-385-058	ID 0.258	OD 0.553	Thickness 0.058	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-386-058	ID 0.876	OD 1.12	Thickness 0.058	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-387-103	ID 0.672	OD 1.248	Thickness 0.103	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-388-165	ID 0.817	OD 2.495	Thickness 0.165	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-389-060	ID 0.41	OD 0.736	Thickness 0.06	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-39-030	ID 0.128	OD 0.312	Thickness 0.03	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-39-036	ID 0.128	OD 0.312	Thickness 0.036	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-390-016	ID 0.207	OD 0.502	Thickness 0.016	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-391-029	ID 0.395	OD 0.624	Thickness 0.029	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-392-117	ID 0.442	OD 0.998	Thickness 0.117	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-393-101	ID 0.833	OD 1.373	Thickness 0.101	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-394-016	ID 0.299	OD 0.501	Thickness 0.016	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-395-082	ID 0.537	OD 1.06	Thickness 0.082	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-396-047	ID 0.421	OD 0.805	Thickness 0.047	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-397-073	ID 0.903	OD 1.36	Thickness 0.073	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-398-100	ID 0.268	OD 0.562	Thickness 0.1	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-399-046	ID 0.318	OD 0.444	Thickness 0.046	Material 316 Stainless Steel	ID TOL +-.005	OD TOL +-.005	Quantity
380-40-034	ID 0.128	OD 0.351	Thickness 0.034	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.