These snap-in button-dome fasteners provide positive locking in quick change applications where there is frequent insertion and removal of a fixture. They allow for consistent fastening force eliminating the chance for under or over tightening by the operator. They are designed to be used with QCPC-series clamping pins. The fastener is mounted to the fixture and the pin is mounted to the base. Simply press the fastener on to the pin to lock in place with four balls. Pressing the button releases the balls and allows the fastener to be removed. Two different head styles are available to meet a wide range of application needs. The body and button are made from 303 stainless steel. The balls are made from 440C stainless steel. The spring is made from 304 stainless steel. The O-ring is made from fluororubber.