Split Lock Washer

Split Lock Washers are a left hand helix and allow the thread to be tightened in a right hand direction only. Split Lock Washers will continue to hold the bolt against the substrate and maintain friction when loosened slightly, whereas a plain washer will not.

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Stainless Steel
Stainless Steel Split Lock Washers are made of stainless steel material. They come in different dimensions and have ASTM finish.

Zinc
Zinc Split Lock Washers are also known as spring lock washers. They provide a positive locking action. The take-up compensates for loosening caused by slight material wear.