A headless fastener externally threaded on both ends with each threaded portion of one but not necessarily the same nominal diameter. It is designed to be locked in place by either a ring, lock, serrated or a ring, lock, keyed.
NSN 6685-01-006-2940
NSN 5855-01-461-8169
NSN 5999-01-580-0934
NSN 5985-01-346-2339
NSN 2925-01-411-4666
NSN 6645-01-337-1806
NSN 6240-00-705-7731
NSN 6650-01-207-2905
NSN 5996-01-408-8805
NSN 6320-01-484-7734
NSN 5985-01-325-3327
NSN 6610-01-507-9476