Correct option is D
A
spring washer is a type of
lock washer designed to apply tension or maintain a preload between the bolt and the joint, ensuring that fasteners stay tight and secure. Its unique shape, typically a helical coil or conical profile, gives it flexibility and elasticity. Below are the key benefits of spring washers: Widely used in
automotive,
aerospace, and
machinery industries where vibrations and shocks are common.
