A six-sided, internally threaded fastener with rounded projections on the top surface of the corners of the fastener. The six-projection style has weldable projections at all six corners; the three projection style has weldable projections atop every other corner. The threaded hole runs
through the center and has a pilot for the entire circuference of the opening which extends above the top surface of the nut and above the projections. The remainder of the top surface of the nut is flat.