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 5925-01-240-3009
NSN 5950-01-121-9033
NSN 5996-01-288-5955
NSN 5835-01-138-8622
NSN 7035-01-232-7263
NSN 5998-00-461-3102
NSN 6130-01-079-3479
NSN 6685-01-041-1630
NSN 5996-01-388-7618
NSN 5920-01-463-8484
NSN 6620-00-017-8098
NSN 2925-00-480-9068