This provides better security with large fastener heads. External-Internal/Combination lock washers have teeth on both the inside and outside of the ring. Internal-tooth lock washers have teeth located on the inside of the ring and provide a good connection with small fastener heads.Įxternal-tooth lock washer (also called a "star washer") have the teeth located on the outside of the washer ring, which works well with large fastener heads. The ends of the ring bite into fastener material to keep it from turning. Types of Spring Lock WashersĪ helical lock washer (also called a "split washer") looks like a ring with uneven ends. Others appear star shaped with an outer ring of teeth. Some lock washers look like rings with uneven ends. Each is designed for use in a particular application. Lock washers have their own various models. For lock washers, they are designed to keep nuts and bolts from coming loose. Each washer type has it own unique purpose. Washers are available in all sorts of shapes and sizes.
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