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 5920-00-468-3074
NSN 5990-00-827-0684
NSN 5915-01-492-5333
NSN 5910-01-628-0339
NSN 2925-01-197-7864
NSN 5990-01-481-8441
NSN 6220-01-498-1369
NSN 4140-01-135-4617
NSN 5985-01-463-3148
NSN 5975-01-375-3382
NSN 5925-00-126-1489
NSN 5975-01-207-9532