838173-A is referenced by 4 patents.
838,173. Anchor-nuts. OHIO NUT & BOLT CO. Feb. 6, 1958 [June 6, 1957], No. 3948/58. Class 89(1) An anchor-nut comprises a body B" with a screwed hole 20 therethrough, one side of the body having a smooth flat area 23 to engage a workpiece, and the other side of the body having a recess 22, the bottom of which is flat and parallel to area 23. A pilot 21 is formed around the hole, and the recess diameter corresponds to the correct size of welding electrode, thus acting as a gauge and also locating the electrode during welding of the nut to the work. In a modification, the nut is symmetrical about the axis of the screwed hole and has two recesses.