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 5960-01-196-3344
NSN 6320-01-216-1678
NSN 6130-00-153-3136
NSN 5990-01-217-4590
NSN 5905-01-137-8898
NSN 5920-01-426-8517
NSN 5920-01-525-7688
NSN 5950-01-517-6189
NSN 5965-01-578-7378
NSN 5990-01-439-4643
NSN 5998-01-634-0604
NSN 7035-01-613-8345