Full Nut

STANDARD NUT. These nuts are, on the face of it, your ordinary, every day nut, however, there were two methods of manufacture. The older style (BEARING SURFACE NUT - shown here) was brought about because the nuts were made on a lathe from hex bar. The top side had the corners slightly rounded, and the bottom side did not. You can also see the swirl marks of the cutting tool in the top and bottom of the nut. The more modern manufacturing process involves the nut being stamped out, so both top and bottom corners are slightly rounded, and there are no lathe tool marks.