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 7035-00-616-4410
NSN 6130-01-006-7990
NSN 5990-00-840-6571
NSN 5960-01-543-0235
NSN 7035-01-183-1989
NSN 5998-01-382-7282
NSN 5999-01-435-2300
NSN 6105-01-121-0520
NSN 5996-00-161-4202
NSN 6650-00-296-4670
NSN 5835-01-106-0199
NSN 5945-01-359-6337