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 6650-01-024-9554
NSN 5935-01-476-5473
NSN 5910-01-499-4766
NSN 5915-01-162-0074
NSN 4140-00-147-8971
NSN 5925-01-250-2514
NSN 5915-00-932-4626
NSN 5998-00-076-3269
NSN 5975-01-546-6707
NSN 6645-01-314-2889
NSN 7035-01-276-0355
NSN 4140-01-632-4933