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 5895-00-366-0216
NSN 5905-01-535-4896
NSN 5920-00-527-9473
NSN 6135-01-589-0333
NSN 5975-00-754-5299
NSN 5920-01-437-7513
NSN 6130-01-152-2019
NSN 5905-01-162-9149
NSN 5945-01-422-0381
NSN 5905-01-281-8830
NSN 6135-01-010-0891
NSN 6145-00-233-5450