Patent ID: 8807896

Claim:
A fastener for use in a high vibration application wherein the fastener is configured to be engaged to a blind hole, the fastener comprising: the fastener configured to be engaged to the blind hole; a lock washer including wedge locking action fastening features; and wherein the wedge locking action fastening features include a shoulder feature cam surface configured to prevent the fastener from turning relative to the lock washer in a tightening direction and comprising a shoulder feature slope angle of between forty degrees and fifty five degrees between the shoulder feature cam surface and a radial plane extending normal to the rotational axis of a shank of the fastener; and wherein the wedge locking action fastening features further include a ramp feature cam surface comprising a ramp feature slope angle of between five degrees and fifteen degrees between the ramp feature cam surface and the radial plane extending normal to the rotational axis of a shank of the fastener, wherein the ramp feature slope angle includes a greater inclination than a pitch angle of the fastener such that the fastener is prevented from backing out.