Pallet Receivers are made of high-grade cast iron. A pallet receiver for a machine tool is disclosed utilizing a pin and socket for registration and alignment. A pallet clamp piston is employed to clamp the pallet to the receiver base for subsequent machining operations. A registration pin is rigidly secured to the receiver base and a cooperating pin socket is mounted to the pallet under face by means of a compliant diaphragm spring so that as the socket and pin are engaged during the first portion of clamp piston movement the pallet will be registered and aligned with respect to the receiver base.