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 5960-01-536-9763
NSN 6145-01-164-1750
NSN 5950-01-070-9075
NSN 6130-01-285-9151
NSN 6645-01-265-2746
NSN 5935-01-656-4665
NSN 6240-00-826-1349
NSN 5975-01-165-7048
NSN 5920-01-061-4608
NSN 6620-01-240-3361
NSN 6650-01-055-2778
NSN 6645-00-930-9356