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Split lock washers are manufactured with a trapezoidal cross-section that deflects under load and can be used with or without a hardened flat washer. They provide marginal resistance to vibration loosening and are ideal in applications where fasteners have a tendency to rotate or lose friction. Split lock washers are forged from hardened steel and zinc coated. They are covered by ASME B18.21.1.
Dottie® LW516 Lock Washer, 5/16 in Trade, 0.314 to 0.322 x 0.583 in Dia, Spring Steel, Zinc-Plated, Gray/Silver