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 6105-01-203-9963
NSN 6320-00-681-1324
NSN 4140-00-106-6780
NSN 5990-01-313-5543
NSN 4140-01-353-2205
NSN 5925-00-715-2001
NSN 5910-01-168-5876
NSN 6650-01-203-4746
NSN 5960-00-171-9575
NSN 5905-01-355-8919
NSN 5855-01-003-7102
NSN 5996-01-520-4250