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 1001–1050 of 1,280 products

SKU ID OD Thickness Material Size ID TOL OD TOL Quantity

SP1-48

ID 0.078
OD 0.164
Thickness 0.014
Material Stainless Steel
Size 1
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP1-49

ID 0.078
OD 0.164
Thickness 0.002
Material Stainless Steel
Size 1
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP1-5

ID 0.093
OD 0.203
Thickness 0.004
Material Stainless Steel
Size 2
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP1-50

ID 0.093
OD 0.203
Thickness 0.002
Material Stainless Steel
Size 2
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP1-51

ID 0.125
OD 0.187
Thickness 0.002
Material Stainless Steel
Size 4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP1-52

ID 0.187
OD 0.25
Thickness 0.002
Material Stainless Steel
Size 10
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP1-6

ID 0.093
OD 0.203
Thickness 0.006
Material Stainless Steel
Size 2
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP1-7

ID 0.093
OD 0.203
Thickness 0.01
Material Stainless Steel
Size 2
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP1-8

ID 0.093
OD 0.203
Thickness 0.016
Material Stainless Steel
Size 2
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP1-9

ID 0.125
OD 0.187
Thickness 0.004
Material Stainless Steel
Size 4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-27

ID 0.25
OD 0.375
Thickness 0.004
Material Stainless Steel
Size 1/4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-28

ID 0.25
OD 0.375
Thickness 0.006
Material Stainless Steel
Size 1/4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-29

ID 0.25
OD 0.375
Thickness 0.01
Material Stainless Steel
Size 1/4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-30

ID 0.25
OD 0.375
Thickness 0.016
Material Stainless Steel
Size 1/4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-31

ID 0.25
OD 0.375
Thickness 0.031
Material Stainless Steel
Size 1/4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-32

ID 0.25
OD 0.375
Thickness 0.063
Material Stainless Steel
Size 1/4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-33

ID 0.25
OD 0.375
Thickness 0.125
Material Stainless Steel
Size 1/4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-34

ID 0.25
OD 0.375
Thickness 0.25
Material Stainless Steel
Size 1/4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-35

ID 0.25
OD 0.375
Thickness 0.5
Material Stainless Steel
Size 1/4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-36

ID 0.313
OD 0.5
Thickness 0.01
Material Stainless Steel
Size 5/16
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-37

ID 0.313
OD 0.5
Thickness 0.016
Material Stainless Steel
Size 5/16
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-38

ID 0.313
OD 0.5
Thickness 0.031
Material Stainless Steel
Size 5/16
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-39

ID 0.313
OD 0.5
Thickness 0.063
Material Stainless Steel
Size 5/16
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-41

ID 0.375
OD 0.562
Thickness 0.01
Material Stainless Steel
Size 3/8
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-42

ID 0.375
OD 0.562
Thickness 0.016
Material Stainless Steel
Size 3/8
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-43

ID 0.375
OD 0.562
Thickness 0.031
Material Stainless Steel
Size 3/8
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-44

ID 0.375
OD 0.562
Thickness 0.063
Material Stainless Steel
Size 3/8
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-45

ID 0.375
OD 0.562
Thickness 0.125
Material Stainless Steel
Size 3/8
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-46

ID 0.5
OD 0.75
Thickness 0.01
Material Stainless Steel
Size 1/2
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-47

ID 0.5
OD 0.75
Thickness 0.016
Material Stainless Steel
Size 1/2
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-48

ID 0.5
OD 0.75
Thickness 0.031
Material Stainless Steel
Size 1/2
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-49

ID 0.5
OD 0.75
Thickness 0.063
Material Stainless Steel
Size 1/2
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-60

ID 0.25
OD 0.375
Thickness 0.008
Material Stainless Steel
Size 1/4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-61

ID 0.25
OD 0.375
Thickness 0.012
Material Stainless Steel
Size 1/4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-62

ID 0.25
OD 0.375
Thickness 0.014
Material Stainless Steel
Size 1/4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-63

ID 0.25
OD 0.375
Thickness 0.094
Material Stainless Steel
Size 1/4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-64

ID 0.25
OD 0.375
Thickness 0.188
Material Stainless Steel
Size 1/4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-65

ID 0.25
OD 0.375
Thickness 0.375
Material Stainless Steel
Size 1/4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-66

ID 0.25
OD 0.375
Thickness 0.002
Material Stainless Steel
Size 1/4
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-67

ID 0.375
OD 0.562
Thickness 0.002
Material Stainless Steel
Size 3/8
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-68

ID 0.375
OD 0.562
Thickness 0.004
Material Stainless Steel
Size 3/8
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-69

ID 0.375
OD 0.562
Thickness 0.006
Material Stainless Steel
Size 3/8
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-70

ID 0.375
OD 0.562
Thickness 0.008
Material Stainless Steel
Size 3/8
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-71

ID 0.375
OD 0.562
Thickness 0.012
Material Stainless Steel
Size 3/8
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-72

ID 0.375
OD 0.562
Thickness 0.014
Material Stainless Steel
Size 3/8
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-73

ID 0.375
OD 0.562
Thickness 0.094
Material Stainless Steel
Size 3/8
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-74

ID 0.375
OD 0.562
Thickness 0.188
Material Stainless Steel
Size 3/8
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-75

ID 0.375
OD 0.562
Thickness 0.25
Material Stainless Steel
Size 3/8
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-76

ID 0.375
OD 0.562
Thickness 0.375
Material Stainless Steel
Size 3/8
ID TOL +.005-.000
OD TOL +-.005
Quantity

SP2-77

ID 0.375
OD 0.562
Thickness 0.5
Material Stainless Steel
Size 3/8
ID TOL +.005-.000
OD TOL +-.005
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.