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Flat Washers

Flat washers are some of the most common fastening products in existence. They are machinery washers designed to be placed under the head of a bolt or nut to provide a smooth bearing surface and distribute the fastener load over a wider area. At Fastco, Flat washers are available in both steel and stainless steel materials, with coating options available for steel washers to enhance corrosion resistance. From structural steel applications to marine environments, flat washers are used in virtually any industrial context where fastening is required.

Your Source for Wholesale Flat Washers

As a trusted industrial fastener distributor in Tacoma, WA, Fastco supplies customers nationwide with washers in a wide range of sizes, materials, and coatings, including USS and SAE flat washers. Order online using the options below, or contact us to learn more about our selection of flat machinery washers.

Wholesale Steel and Stainless Steel Flat Washers

Our ready-to-ship inventory includes standard flat steel washers, stainless steel washers, USS flat washers, and SAE flat washers. With convenient bulk ordering, volume discounts, and fast shipping, we can get you the flat washers you need at great prices. Not sure which flat washers are best for your application? Contact us, and our team of fastening experts will help you find the right flat washers for your job.

SAE Flat Washers and USS Flat Washers

At Fastco, we distribute both SAE flat washers and USS flat washers, the two primary categories of flat washers. While both designations are used in a wide range of industrial contexts, there are key differences between SAE and USS flat washers:
  • SAE Flat Washers: Often referred to as "standard washers," SAE flat washers are manufactured to meet the standards established by the Society of Automotive Engineers (SAE). They are ideal for most general applications in many industries, including automotive, electrical, manufacturing, and more.
  • USS Flat Washers: USS flat washers are larger in thickness and diameter compared to SAE washers, making them better options for heavy-duty applications. Their larger dimensions allow them to create an extremely secure grip, reducing the chance of loosening due to vibrations or other external factors. USS flat washers are used in rugged industries, including construction, machinery, maintenance applications, and more.

Size and Diameter Ranges for Flat Washers

Our flat washers are available in a wide range of dimensions:
  • Size Range: #12 – 3"
  • Inside Diameter Range: 5/32” – 1 7/16”
  • Outside Diameter Range: 3/8" – 3"

Material and Finish Options for Flat Machinery Washers

Plain Finish Flat Steel Washers

Plain finish flat washers are made from Grade 2 steel and do not have any additional coatings. Because plain finish flat steel washers have no enhanced corrosion resistance, they should be used in dry, indoor applications.

Zinc-Coated Flat Washers

As their name indicates, these are flat steel washers with a zinc coating that provides moderate corrosion resistance. The zinc coating creates a protective layer for the washer, shielding it from light exposure to moisture. While zinc-coated flat washers don't offer the same level of corrosion protection as hot-dipped galvanized or stainless washers, they are cost-effective solutions for applications requiring moderate resistance to rust.

Hot Dipped Galvanized Flat Washers

These flat washers undergo a hot-dipping process that creates a thick layer of zinc coating. The hot-dipped galvanized coating provides excellent strength and corrosion protection, making these flat washers ideal for outdoor applications and environments requiring high exposure to moisture and harsh weather conditions.

18-8 Stainless Steel Flat Washers (A2 Stainless Steel)

18-8 Stainless Steel flat washers feature even higher corrosion resistance, making them excellent washers for applications requiring extensive exposure to moisture and corrosive elements, including outdoor structures. 18-8 stainless steel flat washers also have high strength and can bear heavy loads.

316 Stainless Steel Flat Washers (A4 Stainless Steel)

If you need ultimate corrosion resistance, 316 Stainless Steel flat washers are your solution. Their outstanding corrosion resistance makes them superior washers for applications requiring extreme exposure to saltwater, chemicals, and other harsh elements. They also have exceptional durability and strength, making 316 stainless steel washers a preferred choice for demanding industrial and marine applications.

Contact Us to Learn How We Supply Flat Washers at Wholesale Prices

If you need a supplier you can trust for all your washers and other industrial fasteners, Fastco has you covered. Contact our Fastco Inc. sales staff or call us at 253-383-1767 for an immediate response. With quick order turnaround, fast shipping, and wholesale prices, Fastco is your source for flat washers, fender washers, and other fastener supplies.

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