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 6320-01-501-7935
NSN 5985-00-925-1216
NSN 5975-01-378-7762
NSN 4140-01-584-4107
NSN 5950-01-169-9867
NSN 6150-01-195-6931
NSN 6650-00-960-5040
NSN 2925-01-471-4912
NSN 5965-01-461-2850
NSN 5910-01-342-8347
NSN 5910-00-163-9940
NSN 5920-01-415-6546