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 5985-01-447-3823
NSN 5965-01-645-1505
NSN 5925-01-394-4953
NSN 6610-00-202-5481
NSN 5945-01-168-2131
NSN 6650-01-433-3520
NSN 6130-00-822-4903
NSN 5950-01-333-8937
NSN 5905-00-459-0291
NSN 5996-00-899-8698
NSN 5945-01-175-5779
NSN 2925-01-014-8007