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 3501–3550 of 4,985 products

SKU ID OD Thickness Material ID TOL OD TOL Quantity

300-3498-015

ID 0.13
OD 0.386
Thickness 0.015
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3499-020

ID 0.193
OD 0.394
Thickness 0.02
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-350-015

ID 0.13
OD 0.383
Thickness 0.015
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3500-040

ID 0.14
OD 0.405
Thickness 0.04
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3501-030

ID 0.267
OD 0.537
Thickness 0.03
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3503-030

ID 0.129
OD 0.315
Thickness 0.03
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3503-078

ID 0.129
OD 0.315
Thickness 0.078
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3504-031

ID 0.203
OD 0.437
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3505-020

ID 0.191
OD 0.465
Thickness 0.02
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3506-030

ID 0.378
OD 0.501
Thickness 0.03
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3507-040

ID 0.263
OD 0.552
Thickness 0.04
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3508-060

ID 0.255
OD 0.564
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3510-079

ID 0.374
OD 0.874
Thickness 0.079
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3510-120

ID 0.374
OD 0.874
Thickness 0.12
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3511-016

ID 0.32
OD 0.495
Thickness 0.016
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3511-040

ID 0.32
OD 0.495
Thickness 0.04
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3513-062

ID 0.504
OD 1.001
Thickness 0.062
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3514-018

ID 0.206
OD 1.058
Thickness 0.018
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3515-060

ID 0.318
OD 1.373
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3516-060

ID 2.01
OD 2.75
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3517-040

ID 0.175
OD 0.446
Thickness 0.04
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3519-032

ID 0.17
OD 0.354
Thickness 0.032
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-352-010

ID 0.131
OD 0.181
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3521-030

ID 0.199
OD 0.469
Thickness 0.03
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3522-031

ID 0.195
OD 0.75
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3523-005

ID 0.127
OD 0.188
Thickness 0.005
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3523-010

ID 0.127
OD 0.188
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3525-020

ID 0.09
OD 0.235
Thickness 0.02
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3526-004

ID 0.128
OD 0.241
Thickness 0.004
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3527-007

ID 0.19
OD 0.283
Thickness 0.007
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3528-047

ID 0.266
OD 0.497
Thickness 0.047
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3529-040

ID 0.206
OD 0.499
Thickness 0.04
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-353-005

ID 0.131
OD 0.24
Thickness 0.005
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3532-062

ID 0.205
OD 0.63
Thickness 0.062
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3533-100

ID 0.33
OD 0.632
Thickness 0.1
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3536-090

ID 0.378
OD 0.746
Thickness 0.09
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3537-120

ID 0.348
OD 0.75
Thickness 0.12
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3539-060

ID 0.331
OD 1.248
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-354-035

ID 0.131
OD 0.25
Thickness 0.035
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3545-020

ID 0.338
OD 0.426
Thickness 0.02
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3547-060

ID 0.168
OD 0.498
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3548-048

ID 0.26
OD 0.611
Thickness 0.048
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-355-010

ID 0.131
OD 0.252
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-355-060

ID 0.131
OD 0.252
Thickness 0.06
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3550-020

ID 0.381
OD 0.657
Thickness 0.02
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3552-031

ID 0.307
OD 0.747
Thickness 0.031
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3553-090

ID 0.267
OD 0.748
Thickness 0.09
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3559-032

ID 0.094
OD 0.247
Thickness 0.032
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-356-010

ID 0.131
OD 0.27
Thickness 0.01
Material Stainless Steel
ID TOL +-.005
OD TOL +-.005
Quantity

300-3560-008

ID 0.192
OD 0.249
Thickness 0.008
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.