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 251–300 of 1,280 products

SKU ID OD Thickness Material Size Quantity

N14-500093NM

ID 0.253
OD 0.5
Thickness 0.093
Material Nylon
Size 0.25
Quantity

N14-562062NM

ID 0.253
OD 0.562
Thickness 0.062
Material Nylon
Size 0.25
Quantity

N18-500031NM

ID 0.315
OD 0.5
Thickness 0.031
Material Nylon
Size 0.25
Quantity

N18-500062NM

ID 0.315
OD 0.5
Thickness 0.062
Material Nylon
Size 0.3125
Quantity

N18-875062NM

ID 0.343
OD 0.875
Thickness 0.062
Material Nylon
Size 0.3125
Quantity

N2-187031NM

ID 0.093
OD 0.187
Thickness 0.031
Material Nylon
Size #2
Quantity

N2-250020NM

ID 0.093
OD 0.25
Thickness 0.02
Material Nylon
Size #2
Quantity

N2-250031NM

ID 0.093
OD 0.25
Thickness 0.031
Material Nylon
Size #2
Quantity

N2-281020NM

ID 0.093
OD 0.281
Thickness 0.02
Material Nylon
Size #2
Quantity

N2-281031NM

ID 0.093
OD 0.281
Thickness 0.031
Material Nylon
Size #2
Quantity

N20-100062NM

ID 0.406
OD 1.0
Thickness 0.062
Material Nylon
Size 0.375
Quantity

N20-625031NM

ID 0.385
OD 0.625
Thickness 0.031
Material Nylon
Size 0.375
Quantity

N20-625062NM

ID 0.385
OD 0.625
Thickness 0.062
Material Nylon
Size 0.375
Quantity

N20-750062NM

ID 0.378
OD 0.75
Thickness 0.062
Material Nylon
Size 0.3125
Quantity

N22-750031NM

ID 0.443
OD 0.75
Thickness 0.031
Material Nylon
Size 0.375
Quantity

N22-750062NM

ID 0.443
OD 0.75
Thickness 0.062
Material Nylon
Size 0.3125
Quantity

N24-750031NM

ID 0.505
OD 0.75
Thickness 0.031
Material Nylon
Size 0.3125
Quantity

N24-750062NM

ID 0.505
OD 0.75
Thickness 0.062
Material Nylon
Size 0.5
Quantity

N24-875031NM

ID 0.515
OD 0.875
Thickness 0.031
Material Nylon
Size 0.5
Quantity

N24-875062NM

ID 0.515
OD 0.875
Thickness 0.062
Material Nylon
Size 0.5
Quantity

N4-250020NM

ID 0.115
OD 0.25
Thickness 0.02
Material Nylon
Size #3
Quantity

N4-250031NM

ID 0.115
OD 0.25
Thickness 0.031
Material Nylon
Size #4
Quantity

N4-250062NM

ID 0.115
OD 0.25
Thickness 0.062
Material Nylon
Size #4
Quantity

N4-281030NM

ID 0.125
OD 0.281
Thickness 0.03
Material Nylon
Size #5
Quantity

N4-281031NM

ID 0.115
OD 0.281
Thickness 0.031
Material Nylon
Size #4
Quantity

N4-281050NM

ID 0.115
OD 0.281
Thickness 0.05
Material Nylon
Size #4
Quantity

N4-281062NM

ID 0.115
OD 0.281
Thickness 0.062
Material Nylon
Size #4
Quantity

N400AP43

ID 0.396
OD 0.99
Thickness 0.056
Material Stainless Steel
Size
Quantity

N400AP45

ID 0.521
OD 1.24
Thickness 0.09
Material Stainless Steel
Size
Quantity

N400AP6

ID 0.136
OD 0.276
Thickness 0.028
Material Stainless Steel
Size
Quantity

N400P1

ID 0.063
OD 0.12
Thickness 0.022
Material Stainless Steel
Size
Quantity

N400P10

ID 0.229
OD 0.433
Thickness 0.036
Material Stainless Steel
Size
Quantity

N400P11

ID 0.271
OD 0.49
Thickness 0.056
Material Stainless Steel
Size
Quantity

N400P12

ID 0.334
OD 0.615
Thickness 0.056
Material Stainless Steel
Size
Quantity

N400P13

ID 0.396
OD 0.74
Thickness 0.056
Material Stainless Steel
Size
Quantity

N400P14

ID 0.459
OD 0.865
Thickness 0.056
Material Stainless Steel
Size
Quantity

N400P15

ID 0.521
OD 0.99
Thickness 0.056
Material Stainless Steel
Size
Quantity

N400P16

ID 0.584
OD 1.115
Thickness 0.056
Material Stainless Steel
Size
Quantity

N400P17

ID 0.646
OD 1.24
Thickness 0.09
Material Stainless Steel
Size
Quantity

N400P18

ID 0.792
OD 1.355
Thickness 0.09
Material Stainless Steel
Size
Quantity

N400P19

ID 0.918
OD 1.48
Thickness 0.09
Material Stainless Steel
Size
Quantity

N400P2

ID 0.079
OD 0.151
Thickness 0.022
Material Stainless Steel
Size
Quantity

N400P20

ID 1.042
OD 1.73
Thickness 0.09
Material Stainless Steel
Size
Quantity

N400P21

ID 1.168
OD 1.98
Thickness 0.09
Material Stainless Steel
Size
Quantity

N400P22

ID 1.292
OD 2.23
Thickness 0.14
Material Stainless Steel
Size
Quantity

N400P23

ID 1.418
OD 2.48
Thickness 0.14
Material Stainless Steel
Size
Quantity

N400P24

ID 1.542
OD 2.73
Thickness 0.14
Material Stainless Steel
Size
Quantity

N400P25

ID 1.855
OD 3.23
Thickness 0.14
Material Stainless Steel
Size
Quantity

N400P26

ID 2.105
OD 3.73
Thickness 0.219
Material Stainless Steel
Size
Quantity

N400P27

ID 2.355
OD 3.98
Thickness 0.219
Material Stainless Steel
Size
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.