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 5835-00-754-7255
NSN 5950-01-112-4836
NSN 5975-00-683-3945
NSN 5998-01-634-0604
NSN 5920-00-068-8525
NSN 5975-00-962-2199
NSN 5855-01-187-2293
NSN 5920-00-942-9806
NSN 5925-00-444-7108
NSN 6130-00-266-7496
NSN 6220-01-519-2252
NSN 5905-01-653-6878