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 5855-00-466-2309
NSN 5985-00-383-6178
NSN 6320-00-546-9249
NSN 6130-01-297-9607
NSN 6145-00-166-7950
NSN 5910-01-549-8572
NSN 5925-01-194-3981
NSN 6610-00-152-7216
NSN 5990-01-627-8097
NSN 4140-01-226-0637
NSN 7035-01-354-4318
NSN 2925-01-166-4589