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 2925-00-113-6146
NSN 2925-00-304-1997
NSN 6620-01-191-5934
NSN 7035-01-003-9142
NSN 5925-00-194-9146
NSN 5965-01-528-3186
NSN 5935-01-022-8249
NSN 5965-01-265-6814
NSN 5996-01-298-2133
NSN 6240-00-314-8042
NSN 5945-00-001-9499
NSN 6220-01-474-9393