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 6620-01-444-4048
NSN 5925-00-939-4979
NSN 4140-01-573-4240
NSN 6110-01-197-6954
NSN 5920-01-623-4260
NSN 6145-00-335-1336
NSN 6105-01-116-3203
NSN 5930-01-372-0075
NSN 6145-01-135-8243
NSN 5975-01-492-8362
NSN 5855-00-548-4742
NSN 6240-01-205-0005