Home | Standard Flat Washers - General-Purpose Washers in All Sizes & Materials

Standard Flat Washers - General-Purpose Washers in All Sizes & Materials

Standard washers are the most widely used fastener components across industrial, commercial, and consumer applications, providing reliable load distribution, surface protection, and joint stability. Superior Washer & Gasket Corp supplies standard flat washers in a comprehensive range of sizes and materials-including steel, stainless steel, brass, aluminum, copper, and nylon-from one of the largest domestic washer inventories available.

As an ISO 9001:2015 certified washer manufacturer, we maintain broad inventory of standard washers for fast delivery and offer custom washer production for non-standard sizes and materials. Whether you need standard SAE or USS washers or custom flat washers in specialty materials, our washer supply capabilities deliver consistent quality made in the U.S.A.

  • SAE and USS standard washer sizes in stock
  • Steel, stainless steel, brass, aluminum, and nylon options
  • Custom standard and special washers available
  • ISO 9001:2015 certified quality management
  • Made in the U.S.A. with fast delivery

Showing 101–150 of 1,279 products

SKU ID OD Thickness Material Size Quantity

36-250125

ID 1.187
OD 2.5
Thickness 0.125
Material Stainless Steel
Size 1 1/2
Quantity

36-275125

ID 1.312
OD 2.75
Thickness 0.125
Material Stainless Steel
Size 1 1/2
Quantity

4

ID 0.119
OD 0.281
Thickness 0.025
Material Brass
Size 4
Quantity

4-250032

ID 0.125
OD 0.25
Thickness 0.032
Material Stainless Steel
Size 4
Quantity

4-281025

ID 0.125
OD 0.281
Thickness 0.025
Material Stainless Steel
Size 4
Quantity

4-312032

ID 0.125
OD 0.312
Thickness 0.032
Material Stainless Steel
Size 4
Quantity

4-375040

ID 0.125
OD 0.375
Thickness 0.04
Material Stainless Steel
Size 4
Quantity

4S

ID 0.128
OD 0.375
Thickness 0.025
Material Brass
Size 4S
Quantity

5-281025

ID 0.14
OD 0.281
Thickness 0.025
Material Stainless Steel
Size 5
Quantity

5-312032

ID 0.135
OD 0.312
Thickness 0.032
Material Stainless Steel
Size 5
Quantity

5-328032

ID 0.14
OD 0.328
Thickness 0.032
Material Stainless Steel
Size 5
Quantity

5-437040

ID 0.14
OD 0.437
Thickness 0.04
Material Stainless Steel
Size 5
Quantity

5/8-L

ID 0.687
OD 1.75
Thickness 0.102
Material Brass
Size 5/8 L
Quantity

5/8-R

ID 0.687
OD 1.5
Thickness 0.125
Material Brass
Size 5/8 S
Quantity

5/8-S

ID 0.687
OD 1.5
Thickness 0.102
Material Brass
Size 5/8 S
Quantity

5S

ID 0.14
OD 0.25
Thickness 0.025
Material Brass
Size 5S
Quantity

6-312032

ID 0.156
OD 0.312
Thickness 0.032
Material Stainless Steel
Size 6
Quantity

6-375032

ID 0.156
OD 0.375
Thickness 0.032
Material Stainless Steel
Size 6
Quantity

6-437040

ID 0.156
OD 0.437
Thickness 0.04
Material Stainless Steel
Size 6
Quantity

6L

ID 0.147
OD 0.375
Thickness 0.032
Material Brass
Size 6L
Quantity

6S

ID 0.147
OD 0.312
Thickness 0.028
Material Brass
Size 6S
Quantity

7/16

ID 0.5
OD 1.125
Thickness 0.081
Material Brass
Size 7/16
Quantity

7/8

ID 0.937
OD 2.25
Thickness 0.125
Material Brass
Size 7/8
Quantity

8-312031

ID 0.171
OD 0.312
Thickness 0.031
Material Stainless Steel
Size 8
Quantity

8-343032

ID 0.171
OD 0.343
Thickness 0.032
Material Stainless Steel
Size 8
Quantity

8-375032

ID 0.174
OD 0.375
Thickness 0.032
Material Stainless Steel
Size 8
Quantity

8-Jul

ID 0.937
OD 2.25
Thickness 0.125
Material Brass
Size 8-Jul
Quantity

8L

ID 0.172
OD 0.437
Thickness 0.036
Material Brass
Size 8L
Quantity

8S

ID 0.172
OD 0.375
Thickness 0.032
Material Brass
Size 8S
Quantity

DIN-125-M1,6

ID 1.7
OD 4.0
Thickness 0.3
Material Any Material
Size 1.6
Quantity

DIN-125-M1,7

ID 1.8
OD 4.5
Thickness 0.3
Material Any Material
Size 1.7
Quantity

DIN-125-M10

ID 10.5
OD 21.0
Thickness 2.0
Material Any Material
Size 10
Quantity

DIN-125-M12

ID 13.0
OD 24.0
Thickness 2.5
Material Any Material
Size 12
Quantity

DIN-125-M14

ID 15.0
OD 28.0
Thickness 2.5
Material Any Material
Size 14
Quantity

DIN-125-M16

ID 17.0
OD 30.0
Thickness 3.0
Material Any Material
Size 16
Quantity

DIN-125-M18

ID 19.0
OD 34.0
Thickness 3.0
Material Any Material
Size 18
Quantity

DIN-125-M2

ID 2.2
OD 5.0
Thickness 0.3
Material Any Material
Size 2
Quantity

DIN-125-M2,3

ID 2.5
OD 6.0
Thickness 0.5
Material Any Material
Size 2.3
Quantity

DIN-125-M2,5

ID 2.7
OD 6.5
Thickness 0.5
Material Any Material
Size 2.5
Quantity

DIN-125-M2,6

ID 2.8
OD 7.0
Thickness 0.5
Material Any Material
Size 2.6
Quantity

DIN-125-M20

ID 21.0
OD 37.0
Thickness 3.0
Material Any Material
Size 20
Quantity

DIN-125-M22

ID 23.0
OD 39.0
Thickness 3.0
Material Any Material
Size 22
Quantity

DIN-125-M24

ID 25.0
OD 44.0
Thickness 4.0
Material Any Material
Size 24
Quantity

DIN-125-M26

ID 27.0
OD 50.0
Thickness 4.0
Material Any Material
Size 26
Quantity

DIN-125-M27

ID 28.0
OD 50.0
Thickness 4.0
Material Any Material
Size 27
Quantity

DIN-125-M28

ID 29.0
OD 50.0
Thickness 4.0
Material Any Material
Size 28
Quantity

DIN-125-M3

ID 3.2
OD 7.0
Thickness 0.5
Material Any Material
Size 3
Quantity

DIN-125-M3,5

ID 3.7
OD 8.0
Thickness 0.5
Material Any Material
Size 3.5
Quantity

DIN-125-M30

ID 31.0
OD 56.0
Thickness 4.0
Material Any Material
Size 30
Quantity

DIN-125-M4

ID 4.3
OD 9.0
Thickness 0.8
Material Any Material
Size 4
Quantity

Standard Flat Washer Frequently Asked Questions

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

What are standard flat washers?
Standard flat washers are the most widely used fastener components across industrial, commercial, and consumer applications. They provide reliable load distribution under bolt heads and nuts, protect bearing surfaces from damage, and improve joint stability. Superior Washer stocks standard flat washers in SAE and USS sizes across a comprehensive range of materials including steel, stainless steel, brass, aluminum, nylon, PTFE, fiber, and phenolic.

What is the difference between SAE and USS standard washers?
SAE (Society of Automotive Engineers) washers have a smaller outer diameter relative to the bolt size and are used in applications requiring a more compact bearing surface. USS (United States Standard) washers have a larger outer diameter, providing a broader load distribution area. Both series are stocked in multiple materials at Superior Washer.

What materials are your standard flat washers available in?
Superior Washer standard flat washers are available in 1008/1010 carbon steel, stainless steel (301/302/304), brass (Alloy 260), nylon, PTFE, fiber (vulcanized), and phenolic. Steel and stainless steel are available in both plain and zinc-plated finishes. Material and size options are listed in the product filter on this page.

What types of standard washers do you carry beyond SAE and USS?
In addition to SAE and USS, Superior Washer stocks Type A and Type B flat washers, bolt and screw washers, machine screw washers, N400/N401/N402 series washers, inner and outer race spacers, and race spacers. Standard Brass, Nylon Standard, PTFE Standard, Phenolic Standard, and Standard Fiber types are also available. See the product filter for the full type listing.

Can you produce custom standard washers?
Yes. Our standard washer catalog covers over 1,270 stocked configurations, and we also manufacture custom washers to non-standard dimensions, materials, or finishes. Contact us via the Quick Quote form or call NY (631) 273-8282 or SC (803) 366-3250.

Are your standard flat washers made in the USA?
Yes. All standard flat washers are manufactured in the United States at our facilities in Hauppauge, NY (CAGE Code: 1L160) and Rock Hill, SC (CAGE Code: 4WUG7) under our ISO 9001:2015 certified Quality Management System. Material certifications are available upon request.

Standard sizing is just one part of our catalog. Explore our full range of flat washers to see every material and configuration we offer.