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 1601–1650 of 4,985 products

SKU ID OD Thickness Material ID TOL OD TOL Quantity

300-2565-061

ID 0.632
OD 0.811
Thickness 0.061
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2566-031

ID 0.633
OD 2.0
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2567-031

ID 0.633
OD 2.002
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2569-010

ID 0.636
OD 0.714
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2570-005

ID 0.636
OD 0.752
Thickness 0.005
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2570-010

ID 0.636
OD 0.752
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2571-032

ID 0.636
OD 0.795
Thickness 0.032
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2572-032

ID 0.636
OD 0.844
Thickness 0.032
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2573-010

ID 0.636
OD 0.85
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2574-020

ID 0.636
OD 0.862
Thickness 0.02
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2575-032

ID 0.636
OD 0.911
Thickness 0.032
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2576-005

ID 0.636
OD 1.202
Thickness 0.005
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2577-003

ID 0.636
OD 1.372
Thickness 0.003
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2578-005

ID 0.639
OD 0.859
Thickness 0.005
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2579-010

ID 0.639
OD 0.906
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-258-020

ID 0.122
OD 0.375
Thickness 0.02
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2580-029

ID 0.641
OD 0.997
Thickness 0.029
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2582-002

ID 0.642
OD 0.972
Thickness 0.002
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2583-059

ID 0.642
OD 1.25
Thickness 0.059
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2585-031

ID 0.643
OD 0.811
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2586-031

ID 0.643
OD 0.84
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2588-058

ID 0.643
OD 0.998
Thickness 0.058
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2589-060

ID 0.643
OD 0.999
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-259-031

ID 0.123
OD 0.175
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2590-033

ID 0.643
OD 1.092
Thickness 0.033
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2591-025

ID 0.644
OD 1.002
Thickness 0.025
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2592-031

ID 0.644
OD 1.124
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2594-060

ID 0.644
OD 1.122
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2595-030

ID 0.644
OD 1.374
Thickness 0.03
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2597-010

ID 0.646
OD 1.11
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2600-060

ID 0.647
OD 1.247
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2601-030

ID 0.649
OD 0.859
Thickness 0.03
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2602-062

ID 0.65
OD 1.029
Thickness 0.062
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2603-005

ID 0.65
OD 1.043
Thickness 0.005
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2604-005

ID 0.65
OD 1.172
Thickness 0.005
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2606-010

ID 0.651
OD 0.855
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2607-063

ID 0.652
OD 0.997
Thickness 0.063
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2608-032

ID 0.653
OD 0.998
Thickness 0.032
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-261-030

ID 0.123
OD 0.437
Thickness 0.03
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2610-010

ID 0.654
OD 0.855
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2612-060

ID 0.656
OD 1.0
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2613-006

ID 0.657
OD 0.748
Thickness 0.006
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2614-058

ID 0.657
OD 0.811
Thickness 0.058
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2615-006

ID 0.657
OD 0.843
Thickness 0.006
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2618-047

ID 0.658
OD 0.996
Thickness 0.047
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-262-025

ID 0.123
OD 0.5
Thickness 0.025
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2620-062

ID 0.659
OD 1.123
Thickness 0.062
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2623-056

ID 0.66
OD 0.998
Thickness 0.056
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2624-060

ID 0.66
OD 1.246
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-2625-060

ID 0.66
OD 1.252
Thickness 0.06
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.