Description: Helical lock washer is most commonly referred to as a split washer. It has a distinct design, identified by its circular shape with uneven and open ends. Just like any washer, lock washers are made for securing nuts and bolts in place. Its end bites to the fastener, preventing it from loosening and turning. Premature breakdowns of lock washers are prevented thanks to its durable construction consisting of zinc, aluminum, carbon steel, and others. At MRO Supply, we have affordable yet durable stainless steel split lock washers in diameters from 1/2" to 7/8." Contact us for more details and other inquiries.