These ball lock clamping receptacles are designed to be used in quick change applications where there is frequent insertion and removal of a fastener. They allow for consistent fastening force, eliminating the chance for under or over tightening by the operator. These receptacles are used with the clamping pin QCBA0816-M5. As the pin is inserted into the receptacle, the three balls in receptacle secure the clamping pin in place. The safety lock style allows the balls to be locked in place preventing accidental release. To operate the safety lock feature, the user pushes up on the locking knob and turns it one quarter turn. They can be used with locating pins to provide highly accurate positioning. The bodies are 1045 carbon steel with an electroless nickel plating finish. Balls are made from hardened 440C stainless steel. Springs are made from 304 stainless steel. Ordered separately, stainless steel nuts for fastening the receptacles are referenced on the table.