A hardened cylindrical fastener with multiple spiral flutes on its shank. It also has an end smaller in diameter than the outside diameter of the spiral flutes, which acts as a pilot when driven into a drilled hole.
NSN 5998-01-630-3522
NSN 5975-01-331-0598
NSN 6620-00-905-6590
NSN 6240-00-350-9508
NSN 6105-01-592-4134
NSN 6105-01-145-4324
NSN 5965-00-959-4910
NSN 6645-01-457-3810
NSN 6620-01-625-2855
NSN 6650-01-476-2358
NSN 6650-01-342-5890
NSN 4140-01-502-7423