GOST 22355 Hardened Washer

The GOST 22355 washer is a Russian national standard high-strength flat washer, specified for use in critical bolting assemblies within heavy steel construction, bridge building, and industrial machinery. This standard defines the dimensional and material requirements for washers used with high-strength structural bolts to ensure secure, preloaded connections .

The hardened and ground plain washer GOST undergoes a specialized heat treatment process, achieving a hardness of 35 to 45 HRC (Rockwell C). This treatment, combined with precision grinding, provides a very smooth and flat bearing surface on both faces, with surface quality and dimensional tolerances adhering to strict regulatory standards . This hardened and ground design is essential for evenly distributing the bolt's clamping force over a larger area, preventing indentation and surface damage to the connected materials under extreme preloads .

As a GOST high strength washer, it is specifically engineered for assemblies with high-strength bolts, such as those meeting GOST R 52644, and is a critical component of high-strength structural bolting assemblies for preloaded connections . While the standard shares similarities with international equivalents like DIN 6916 or ISO 7416 , it is a mandatory component for projects requiring full GOST compliance. These washers are widely used in demanding applications including steel bridges, high-rise building frames, wind towers, and various heavy-load structural connections