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 6145-01-445-9788
NSN 6645-01-432-7026
NSN 5960-01-029-2940
NSN 6150-00-250-5166
NSN 6145-01-221-6518
NSN 5855-00-156-5489
NSN 6620-01-026-1776
NSN 6610-00-777-2591
NSN 2925-01-342-1712
NSN 5915-00-175-0507
NSN 6135-01-439-8669
NSN 5915-01-391-7149