Square washers have the shape of a square with a cylindrical hole for a bolt, screw or stud. Washers are placed under the nuts to protect the surface of the part from crumpling, as well as to prevent arbitrary unscrewing of the nuts and pressure distribution on the connected parts. These washers combine high strength properties with good ductility and viscosity. Square washers with special heat treatment can be used in areas with an estimated temperature of up to minus 65 ° C.

The specifics of using such washers is the need for a square shape, for example, in a groove where only a square washer will fit well.

The washer is made of galvanized steel or stainless steel.