A spring washer is one type of washer. Other names that you can meet in everyday life are grover puck, grover. This is a fairly simple small metal fastener that can withstand heavy shock loads and act as a stopper. Grover is used only with DIN 74361 H, which is often called a wheel nut, because it is most often used in mechanical engineering to fasten wheels. The main purpose - is the centering of two connecting parts (for example, the hole in the wheel disc relative to the hub pin) and a strong fixation that prevents the nut from unscrewing by itself.
Scope automotive and machine-building industry, agricultural machinery.
Material steel.
Coating Zinc sheet protects against corrosion, if fasteners are planned to be used in aggressive conditions.