Black Nylon Anti-Loss Washer Washer - 8.7 mm | 0.344 in; 12.7 mm | 0.500 in; Thickness 0.8 mm | 0.032 in; Compatible Screw Sizes 1/4

Retaining Washer locks and seals nuts and bolts in position. Allows preliminary mounting of the bolt before screwing with a nut. The tapered design retains the screw prior to assembly. It cold forms and fully enters the pitch of the screw to provide sealing. Designed to grip outside of screw shank. Easily slides on to the screw and is retained by the screw once assembled. Ideal when pre-assembly of the screw and washer is required. Reduces assembly time and cost.