This standard applies to spherical washers for machine tools
GOST 13438-1968 Referenced Document
GOST 18160-1972 Fasteners. Packing. Marking. Transportation and storage*, 1972-04-19 Update
GOST 9.073-1977 Unified system of protection against corrosion and aging. Metallic and non-metallic inorganic coatings. Types, thickness rows and designations
GOST 13438-1968 history
1968GOST 13438-1968 Spherical washers for machine retaining devices. Design