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 401–450 of 1,280 products

SKU ID OD Thickness Material Quantity

N401P29

ID 2.855
OD 4.98
Thickness 0.219
Material Brass
Quantity

N401P3

ID 0.089
OD 0.183
Thickness 0.022
Material Brass
Quantity

N401P30

ID 3.105
OD 5.48
Thickness 0.344
Material Brass
Quantity

N401P31

ID 0.063
OD 0.183
Thickness 0.022
Material Brass
Quantity

N401P32

ID 0.079
OD 0.214
Thickness 0.022
Material Brass
Quantity

N401P33

ID 0.089
OD 0.245
Thickness 0.028
Material Brass
Quantity

N401P34

ID 0.104
OD 0.307
Thickness 0.028
Material Brass
Quantity

N401P34E

ID 0.104
OD 0.307
Thickness 0.028
Material Brass
Quantity

N401P35

ID 0.12
OD 0.37
Thickness 0.036
Material Brass
Quantity

N401P35B

ID 0.12
OD 0.37
Thickness 0.036
Material Brass
Quantity

N401P35B13

ID 0.12
OD 0.37
Thickness 0.036
Material Brass
Quantity

N401P35C

ID 0.12
OD 0.37
Thickness 0.036
Material Brass
Quantity

N401P35E

ID 0.12
OD 0.37
Thickness 0.036
Material Brass
Quantity

N401P36

ID 0.136
OD 0.401
Thickness 0.036
Material Brass
Quantity

N401P37

ID 0.151
OD 0.433
Thickness 0.036
Material Brass
Quantity

N401P37B

ID 0.151
OD 0.433
Thickness 0.036
Material Brass
Quantity

N401P37C

ID 0.151
OD 0.433
Thickness 0.036
Material Brass
Quantity

N401P37C11

ID 0.151
OD 0.423
Thickness 0.036
Material Brass
Quantity

N401P38

ID 0.183
OD 0.495
Thickness 0.036
Material Brass
Quantity

N401P38C

ID 0.183
OD 0.495
Thickness 0.036
Material Brass
Quantity

N401P39

ID 0.198
OD 0.557
Thickness 0.036
Material Brass
Quantity

N401P39B

ID 0.198
OD 0.557
Thickness 0.036
Material Brass
Quantity

N401P39C

ID 0.198
OD 0.557
Thickness 0.036
Material Brass
Quantity

N401P39C11

ID 0.198
OD 0.557
Thickness 0.036
Material Brass
Quantity

N401P39E

ID 0.198
OD 0.557
Thickness 0.036
Material Brass
Quantity

N401P3C

ID 0.089
OD 0.183
Thickness 0.022
Material Brass
Quantity

N401P3E

ID 0.089
OD 0.183
Thickness 0.022
Material Brass
Quantity

N401P4

ID 0.104
OD 0.214
Thickness 0.022
Material Brass
Quantity

N401P40

ID 0.229
OD 0.62
Thickness 0.056
Material Brass
Quantity

N401P41

ID 0.271
OD 0.74
Thickness 0.056
Material Brass
Quantity

N401P41C13

ID 0.271
OD 0.74
Thickness 0.056
Material Brass
Quantity

N401P42

ID 0.334
OD 0.865
Thickness 0.056
Material Brass
Quantity

N401P43

ID 0.396
OD 0.99
Thickness 0.056
Material Brass
Quantity

N401P44

ID 0.459
OD 1.115
Thickness 0.056
Material Brass
Quantity

N401P45

ID 0.521
OD 1.24
Thickness 0.09
Material Brass
Quantity

N401P46

ID 0.584
OD 1.49
Thickness 0.09
Material Brass
Quantity

N401P47

ID 0.646
OD 1.74
Thickness 0.09
Material Brass
Quantity

N401P48

ID 0.792
OD 1.98
Thickness 0.09
Material Brass
Quantity

N401P49

ID 0.918
OD 2.23
Thickness 0.14
Material Brass
Quantity

N401P4E

ID 0.104
OD 0.214
Thickness 0.022
Material Brass
Quantity

N401P5

ID 0.12
OD 0.245
Thickness 0.028
Material Brass
Quantity

N401P50

ID 1.042
OD 2.48
Thickness 0.14
Material Brass
Quantity

N401P51

ID 1.168
OD 2.73
Thickness 0.14
Material Brass
Quantity

N401P52

ID 1.292
OD 2.98
Thickness 0.14
Material Brass
Quantity

N401P53

ID 1.418
OD 3.23
Thickness 0.14
Material Brass
Quantity

N401P54

ID 1.542
OD 3.48
Thickness 0.219
Material Brass
Quantity

N401P55

ID 1.855
OD 3.98
Thickness 0.219
Material Brass
Quantity

N401P56

ID 2.105
OD 4.48
Thickness 0.219
Material Brass
Quantity

N401P57

ID 2.355
OD 4.98
Thickness 0.219
Material Brass
Quantity

N401P58

ID 2.605
OD 5.48
Thickness 0.344
Material Brass
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.