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 4601–4650 of 4,985 products

SKU ID OD Thickness Material ID TOL OD TOL Quantity

300-630-038

ID 0.171
OD 0.736
Thickness 0.038
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-631-038

ID 0.171
OD 0.748
Thickness 0.038
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-632-020

ID 0.172
OD 0.219
Thickness 0.02
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-633-020

ID 0.172
OD 0.551
Thickness 0.02
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-634-063

ID 0.172
OD 0.625
Thickness 0.063
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-635-020

ID 0.172
OD 0.682
Thickness 0.02
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-636-059

ID 0.172
OD 1.124
Thickness 0.059
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-637-003

ID 0.173
OD 0.246
Thickness 0.003
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-638-031

ID 0.173
OD 0.25
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-639-015

ID 0.173
OD 0.266
Thickness 0.015
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-640-016

ID 0.173
OD 0.269
Thickness 0.016
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-641-025

ID 0.173
OD 0.281
Thickness 0.025
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-642-017

ID 0.173
OD 0.298
Thickness 0.017
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-643-010

ID 0.173
OD 0.309
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-644-030

ID 0.173
OD 0.564
Thickness 0.03
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-645-087

ID 0.173
OD 0.625
Thickness 0.087
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-646-020

ID 0.173
OD 0.686
Thickness 0.02
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-647-062

ID 0.173
OD 0.75
Thickness 0.062
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-648-059

ID 0.173
OD 1.126
Thickness 0.059
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-649-002

ID 0.174
OD 0.56
Thickness 0.002
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-650-031

ID 0.174
OD 0.625
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-651-005

ID 0.175
OD 0.246
Thickness 0.005
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-652-015

ID 0.175
OD 0.246
Thickness 0.015
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-653-016

ID 0.175
OD 0.267
Thickness 0.016
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-654-015

ID 0.175
OD 0.268
Thickness 0.015
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-656-027

ID 0.175
OD 0.279
Thickness 0.027
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-657-034

ID 0.175
OD 0.282
Thickness 0.034
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-658-010

ID 0.175
OD 0.291
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-659-010

ID 0.175
OD 0.296
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-660-032

ID 0.175
OD 0.307
Thickness 0.032
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-661-005

ID 0.175
OD 0.311
Thickness 0.005
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-662-025

ID 0.175
OD 0.312
Thickness 0.025
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-663-031

ID 0.175
OD 0.342
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-665-020

ID 0.175
OD 0.553
Thickness 0.02
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-666-049

ID 0.175
OD 0.626
Thickness 0.049
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-667-062

ID 0.175
OD 0.875
Thickness 0.062
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-668-030

ID 0.175
OD 1.375
Thickness 0.03
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-669-030

ID 0.176
OD 0.468
Thickness 0.03
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-67-010

ID 0.061
OD 0.139
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-670-030

ID 0.176
OD 0.478
Thickness 0.03
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-671-005

ID 0.176
OD 0.484
Thickness 0.005
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-672-032

ID 0.176
OD 0.56
Thickness 0.032
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-673-062

ID 0.176
OD 0.62
Thickness 0.062
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-674-031

ID 0.177
OD 0.626
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-676-005

ID 0.178
OD 0.258
Thickness 0.005
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-677-005

ID 0.178
OD 0.262
Thickness 0.005
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-678-026

ID 0.178
OD 0.265
Thickness 0.026
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-679-035

ID 0.178
OD 0.296
Thickness 0.035
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-680-015

ID 0.178
OD 0.303
Thickness 0.015
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-681-050

ID 0.178
OD 0.308
Thickness 0.05
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.