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 3701–3750 of 4,985 products

SKU ID OD Thickness Material ID TOL OD TOL Quantity

300-379-010

ID 0.133
OD 0.185
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3790-061

ID 0.13
OD 0.252
Thickness 0.061
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3791-024

ID 0.126
OD 0.297
Thickness 0.024
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3792-039

ID 0.198
OD 0.376
Thickness 0.039
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3793-030

ID 0.194
OD 0.5
Thickness 0.03
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3794-016

ID 0.316
OD 0.5
Thickness 0.016
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3796-059

ID 0.286
OD 0.626
Thickness 0.059
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3797-059

ID 0.629
OD 0.746
Thickness 0.059
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3798-117

ID 0.269
OD 0.75
Thickness 0.117
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3799-060

ID 0.507
OD 0.986
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-380-010

ID 0.134
OD 0.183
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3800-117

ID 0.393
OD 1.0
Thickness 0.117
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3801-059

ID 0.33
OD 1.374
Thickness 0.059
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3803-015

ID 0.067
OD 0.125
Thickness 0.015
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3804-015

ID 0.158
OD 0.25
Thickness 0.015
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3805-010

ID 0.167
OD 0.311
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3806-032

ID 0.253
OD 0.373
Thickness 0.032
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3807-030

ID 0.172
OD 0.374
Thickness 0.03
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3808-062

ID 0.261
OD 0.38
Thickness 0.062
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3809-033

ID 0.202
OD 0.438
Thickness 0.033
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3811-025

ID 0.377
OD 0.623
Thickness 0.025
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3812-040

ID 0.206
OD 0.626
Thickness 0.04
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3813-058

ID 0.278
OD 1.0
Thickness 0.058
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3815-103

ID 0.564
OD 1.499
Thickness 0.103
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3817-020

ID 0.082
OD 0.158
Thickness 0.02
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3818-010

ID 0.192
OD 0.251
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3819-032

ID 0.137
OD 0.312
Thickness 0.032
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-382-016

ID 0.134
OD 0.376
Thickness 0.016
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3820-049

ID 0.192
OD 0.471
Thickness 0.049
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3821-061

ID 0.194
OD 0.5
Thickness 0.061
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3822-102

ID 0.253
OD 0.511
Thickness 0.102
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3823-074

ID 0.253
OD 0.592
Thickness 0.074
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3824-088

ID 0.268
OD 0.751
Thickness 0.088
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3825-059

ID 0.326
OD 0.811
Thickness 0.059
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3826-090

ID 0.269
OD 1.0
Thickness 0.09
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3829-062

ID 0.175
OD 0.375
Thickness 0.062
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-383-032

ID 0.134
OD 0.437
Thickness 0.032
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3830-047

ID 0.177
OD 0.375
Thickness 0.047
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3831-090

ID 0.258
OD 0.5
Thickness 0.09
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3832-060

ID 0.207
OD 0.685
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3833-059

ID 0.333
OD 0.826
Thickness 0.059
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3834-073

ID 0.379
OD 0.876
Thickness 0.073
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3835-059

ID 0.497
OD 1.123
Thickness 0.059
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3836-121

ID 0.754
OD 1.126
Thickness 0.121
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3837-027

ID 0.535
OD 1.186
Thickness 0.027
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3839-074

ID 0.316
OD 1.249
Thickness 0.074
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-384-015

ID 0.136
OD 0.239
Thickness 0.015
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3840-015

ID 0.906
OD 1.25
Thickness 0.015
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3841-120

ID 0.394
OD 1.498
Thickness 0.12
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3842-010

ID 1.018
OD 1.498
Thickness 0.01
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.