Round Flat Washers & Shims Search


Seastrom Manufacturing has been the proven leader in the manufacture of round flat washers and shims since 1928. Seastrom’s online catalog offers the largest stock assortment of standard and specialty sizes available in both metallic and non-metallic materials. Our large inventory of round flat washers, shims and metric round flat washers provides our customers maximum flexibility to find the part that best fits their application.

Refine your search by one or all of the following criteria: ID, OD, Thk, Screw Size, Material, Seastrom Standard, ANSI standard, all available part numbers, all part numbers with stock. Create as general or specific a search as you need.
  User Guide
Round Flat Washers
  • View round flat washers by material
  • Seastrom standards and ANSI standards in one search.
  • Seastrom standard flat washers provide an almost infinite number of ID, OD, Thickness and Material combinations to fit an requirement.
  • ID – Inside dimensions from .020” to 3.00”
  • OD - Outside dimensions from .050” to 4.00”
  • Thk – Thicknesses from .010 to .134
  • Metallic materials available: Aluminum, Brass, Beryllium Copper, Copper, Phosphor bronze, Steel (cold rolled steel), Stainless steel 316, Stainless steel, Titanium.
  • Non-metallic materials available: Acetal, Fiberglass, Fibre, Kapton, Mica, Mylar, Neoprene, Nylatron, Nylon, Phenolic, Polyethylene, PTFE, PVC.
ANSI Standard Flat Washers
  • Type B Plain Washers (ASME B 18.21.1 Edition 09-2009) are available in narrow, regular and wide series for each standard screw size.
  • The American National Standards Institute (ANSI) provides standards for general use flat washers. Type B is a series of flat washers with tighter tolerances where outside diameters are categorized as Narrow, Regular or Wide for specific bolt sizes.
  • Available screw sizes from 0 to 1”. If a specified screw size is not listed please email a quote request.
  • Metallic materials available: Aluminum, Brass, Beryllium Copper, Copper, Phosphor bronze, Steel (cold rolled steel), Stainless steel, Titanium.
  • Non-metallic materials available: Acetal, Fiberglass, Fibre, Neoprene, Nylon, Polyethylene, PTFE.
Metric Flat Washers
  • Seastrom standard metric washers meet the ANSI B18.22M standard for soft material flat washers. Part numbers are provided for the Regular category, but Narrow and Wide can also be quoted to meet your requirements.
  • ID – Inside dimensions from 1.95 mm to 17.52 mm
  • OD - Outside dimensions from 4.7 mm to 44 mm
  • Thk – Thicknesses from 0.5 mm to 4 mm
  • Metallic materials available: Aluminum, Brass, Beryllium Copper, Copper, Phosphor bronze, Steel (cold rolled steel), Stainless steel, Titanium.
  • Non-metallic materials available: Acetal, Fiberglass, Fibre, Kapton, Mica, Mylar, Neoprene, Nylatron, Nylon, Phenolic, Polyethylene, PTFE, PVC.


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Round Flat Washers
Metric Flat Washers
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Seastrom and ANSI Standard Round Flat Washers are available in a wide variety of materials and dimensions.

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