Home | 301/302/304 Stainless Steel Flat Washers - Corrosion-Resistant Washers

301/302/304 Stainless Steel Flat Washers - Corrosion-Resistant Washers

Stainless steel flat washers in 301, 302, and 304 grades provide excellent corrosion resistance, strength, and aesthetic quality for fastener assemblies across marine, food processing, pharmaceutical, architectural, and industrial applications. Superior Washer & Gasket Corp manufactures 300-series stainless steel flat washers in a broad range of standard and custom sizes.

Our ISO 9001:2015 certified manufacturing facility supplies stainless steel washers from stock inventory and produces custom stainless flat washers with tight dimensional tolerances. All stainless steel washers are made in the U.S.A. with material certifications available for regulated applications.

  • 301, 302, and 304 stainless steel grades available
  • Broad standard size inventory for fast delivery
  • Custom stainless steel flat washers to specification
  • ISO 9001:2015 certified quality assurance
  • Made in the U.S.A.; certifications available

Showing 1301–1350 of 4,985 products

SKU ID OD Thickness Material ID TOL OD TOL Quantity

300-2231-031

ID 0.503
OD 1.062
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2232-022

ID 0.503
OD 1.12
Thickness 0.022
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2233-005

ID 0.503
OD 1.125
Thickness 0.005
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2234-010

ID 0.503
OD 1.304
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2235-120

ID 0.503
OD 2.0
Thickness 0.12
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2236-005

ID 0.504
OD 0.6
Thickness 0.005
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2237-020

ID 0.504
OD 0.6
Thickness 0.02
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2238-031

ID 0.504
OD 0.62
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2239-025

ID 0.504
OD 0.622
Thickness 0.025
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-224-061

ID 0.114
OD 0.253
Thickness 0.061
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2240-026

ID 0.504
OD 0.69
Thickness 0.026
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2241-060

ID 0.504
OD 0.724
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2242-026

ID 0.504
OD 0.75
Thickness 0.026
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2243-060

ID 0.504
OD 0.762
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2244-026

ID 0.504
OD 0.939
Thickness 0.026
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2245-060

ID 0.504
OD 0.963
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2247-046

ID 0.504
OD 1.03
Thickness 0.046
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2248-010

ID 0.504
OD 1.12
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2249-057

ID 0.504
OD 1.125
Thickness 0.057
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-225-029

ID 0.114
OD 0.282
Thickness 0.029
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2250-036

ID 0.504
OD 1.248
Thickness 0.036
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2251-117

ID 0.504
OD 1.501
Thickness 0.117
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2252-032

ID 0.504
OD 2.0
Thickness 0.032
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2253-019

ID 0.504
OD 2.124
Thickness 0.019
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2255-003

ID 0.505
OD 0.611
Thickness 0.003
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2256-001

ID 0.505
OD 0.619
Thickness 0.001
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2257-005

ID 0.505
OD 0.622
Thickness 0.005
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2258-006

ID 0.505
OD 0.656
Thickness 0.006
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2259-003

ID 0.505
OD 0.963
Thickness 0.003
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-226-010

ID 0.114
OD 0.3
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2260-052

ID 0.505
OD 1.0
Thickness 0.052
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2261-010

ID 0.505
OD 1.062
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2262-093

ID 0.505
OD 1.125
Thickness 0.093
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2263-061

ID 0.505
OD 1.246
Thickness 0.061
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2264-020

ID 0.505
OD 1.252
Thickness 0.02
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2265-125

ID 0.505
OD 1.499
Thickness 0.125
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2266-033

ID 0.505
OD 1.75
Thickness 0.033
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2267-010

ID 0.506
OD 0.683
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2268-030

ID 0.506
OD 0.688
Thickness 0.03
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2269-030

ID 0.506
OD 0.937
Thickness 0.03
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-227-010

ID 0.114
OD 0.307
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2270-010

ID 0.506
OD 0.993
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2272-060

ID 0.506
OD 1.304
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2273-005

ID 0.507
OD 0.581
Thickness 0.005
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2274-003

ID 0.507
OD 0.615
Thickness 0.003
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2275-010

ID 0.507
OD 0.615
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2276-031

ID 0.507
OD 0.664
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2277-031

ID 0.507
OD 0.678
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2278-010

ID 0.507
OD 0.708
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2279-020

ID 0.507
OD 0.747
Thickness 0.02
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

Stainless Steel Flat Washer Frequently Asked Questions

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

What are stainless steel flat washers?
Stainless steel flat washers are manufactured from austenitic stainless steel, most commonly Type 301, Type 302, or Type 304. These alloys offer excellent corrosion resistance in most environments, good mechanical strength, and are non-magnetic in the annealed condition. Stainless steel washers are the most widely used corrosion-resistant metal washers across industrial, food service, marine, and architectural applications.

What is the difference between 301, 302, and 304 stainless steel washers?
Type 301, Type 302, and Type 304 are all austenitic stainless steels with similar corrosion resistance and mechanical properties. Type 301 offers higher strength and work-hardening characteristics, making it useful in spring and formed applications. Type 302 and Type 304 are nearly identical, with the primary difference being carbon content: 304 has a lower maximum carbon content (0.08% vs. 0.15% for 302), which provides slightly better weld corrosion resistance. For most washer applications, all three grades perform reliably.

When should I use stainless steel washers instead of zinc-plated steel?
Stainless steel provides inherent corrosion resistance that does not depend on a coating. Zinc-plated steel washers will corrode if the zinc coating is scratched, worn, or exposed to chlorides. For outdoor, marine, food service, pharmaceutical, or long-term corrosion resistance requirements, stainless steel is the better choice.

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

Are your stainless steel flat washers made in the USA?
Yes. All 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.

Stainless steel is one of our most popular corrosion-resistant materials. Browse the full flat washers catalog to see everything we offer.