Aplain washer(or 'flat washer') is a flatannulus or ring, often of metal, used to spread the load of a screwed fastening. Ita may also be used when the hole is a larger diameter than the fixing nut

Externall teeth starwasherhasserrationson theouter edge, which provides better holding power, because of the greater circumference.This type of washer is especially effective as a lock washer when used with a soft substrate, such as aluminium or plastic, and can resist rotation more than a plain washer on hard surfaces, as the tension between washer and the surface is applied over a much smaller area (the teeth).

Externall teeth lockwasherhasserrations on theouter edge, which provides better holding power, because of the greater circumference.This type of washer is especially effective as a lock washer when used with a soft substrate, such as aluminium or plastic, and can resist rotation more than a plain washer on hard surfaces, as the tension between washer and the surface is applied over a much smaller area (the teeth).

Aplain washer(or 'flat washer') is a flatannulus or ring, often of metal, used to spread the load of a screwed fastening. Ita may also be used when the hole is a larger diameter than the fixing nut

Externall teeth starwasherhasserrationson theouter edge, which provides better holding power, because of the greater circumference.This type of washer is especially effective as a lock washer when used with a soft substrate, such as aluminium or plastic, and can resist rotation more than a plain washer on hard surfaces, as the tension between washer and the surface is applied over a much smaller area (the teeth).

Externall teeth lockwasherhasserrations on theouter edge, which provides better holding power, because of the greater circumference.This type of washer is especially effective as a lock washer when used with a soft substrate, such as aluminium or plastic, and can resist rotation more than a plain washer on hard surfaces, as the tension between washer and the surface is applied over a much smaller area (the teeth).