These receivers are installed in the sub-plate or table to receive the locator units. Thread-in receivers occupy a smaller footprint which optimizes sub-plate space. They are easier to install, less expensive and offer higher pull out strengths than the universal bolt-in receivers. In addition, thread-in receivers allow the sub-plate to be fully machined from one side. 180,000 psi tensile strength minimum. 140,000 psi yield strength minimum. Made from heat-treated 4340 steel with a black oxide finish.