Slotted washers, sometimes called spring washers, have slits cut into their profile. The slits allow for the washer to be compressed, making them ideal for use in applications where there is a need to compensate for vibration or other forces that may cause the fastener to loosen.

Slotted washers are most commonly used in conjunction with bolts and nuts to prevent them from loosening. They are also commonly used in electrical applications, as they can help to protect wires from damage.

Slotted washers are typically made of durable materials such as stainless steel, hardened steel, or spring steel. The material used will depend on the specific application and the load requirements.

The size of the slotted washer you need will depend on the size of the bolt or nut you are using. It is important to select a washer that is the correct size to ensure proper fit and performance.