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 5985-01-542-9490
NSN 4140-01-337-3966
NSN 6240-01-401-5340
NSN 5915-01-090-2480
NSN 6135-00-080-9176
NSN 6145-00-089-0547
NSN 6240-00-166-0340
NSN 5915-00-625-2285
NSN 5910-01-431-9072
NSN 6220-01-437-6820
NSN 5920-01-418-5232
NSN 5996-00-543-1566