This anti-loss and retaining washer is similar to our standard flat washers TU, but with a specially configured I.D. designed to grip the outside of the screw shank. The anti-loss washer slides on the screw easily, but is retained on the screw. For use in applications requiring pre-assembly of the screw and washer, to reduce final assembly cost. We offer a big range of PA66 (nylon) screws, please visit our range: Screws & Nuts. The retaining washer can be supplied in dyed colours, please contact us.