Secure Fastening in Tight Spaces with Square Washers


Boker’s, Inc. offers complete production of non-standard and customized square and rectangular washers and spacers designed to provide secure fastening, turn resistance, and load distribution—even in the tightest clearances. The square and rectangular washers are available in a wide range of materials, bolt, I.D. sizes, O.D. sizes up to 12 x 12 in. (30.5 x 30.5 cm), and in thicknesses ranging from .005 to .190 in. (.127 to 4.8 mm).


Square washers are widely used as shims, separating the bolt crown from what is being anchored, reducing the possibilities of deformity when tightening and helping to keep joining surfaces undamaged. This bushing or packing approach is often used in the construction industry or in applications to act as force-countering support in fastener rods and complex part profiles.


Square and rectangular washers are often emerging as a higher-performance alternative to round washers in a diverse array of applications subject to vibration forces, ranging from industrial machinery to aerospace, from washing machines to automobiles. By effectively expanding the diameter of the bolt’s head, square washers offer greater dispersal of load and turning resistance in many applications, helping maintain fastening integrity, and protecting and prolonging the life of connected parts.


Boker’s square and rectangular washers are custom produced to order in short, medium, and long runs with fast delivery and minimal tool cost with available 3D prototypes. Options in more 2,000 commonly specified and difficult-to-find materials are available, including metallic and non-metallic materials. Metallic material selections include low-carbon sheet steel, various spring steels, stainless steel, aluminum, brass, copper, and a range of non-metallic material options. Available metal finishes include black oxide, nickel, zinc, and others.


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