Nylon washers aremuch like other washers, serving as small pieces of hardware for various applications. … Washers are typically thin, disc-shaped plates with a hole through the middle. They’re usually used to more evenly distribute the load or force of a threaded fastener (e.g., a screw or bolt), or to act as a spacer.A nyloc nut, also referred to as a nylon-insert lock nut, polymer-insert lock nut, or elastic stop nut, is a kindof locknutwith a nylon collar that increases friction on the screw thread. … Nyloc nuts retain their locking ability up to 250 °F (121 °C).