This heavy duty shaft-mount fastener provides positive locking in quick change applications where there is frequent insertion and removal of a fixture. It allows for consistent fastening force eliminating the chance for under or over tightening by the operator. They are designed to be used with QCSJS-S and QCTHS-B receptacles. The fastener is designed to be mounted to a shaft for extended reach and the receptacle is mounted to the base. As the fastener is inserted into the receptacle, the pins on the fastener align with the grooves in the receptacle. Rotating the fastener one quarter turn aligns and locks the fastener into place. The body is made from 1045 steel with an electroless nickel plated finish. The pin is made from 303 stainless steel.