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 2925-00-017-9807
NSN 5996-01-544-1467
NSN 6135-01-360-1620
NSN 5999-01-516-7509
NSN 6685-01-617-8515
NSN 5975-01-617-0684
NSN 6610-01-325-6767
NSN 2925-01-127-0167
NSN 6650-01-060-3628
NSN 5996-01-343-0651
NSN 2925-01-565-6410
NSN 5915-00-054-6637