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 6650-01-312-0778
NSN 4140-01-205-0197
NSN 5835-01-424-0054
NSN 5920-01-367-5791
NSN 5990-01-039-6284
NSN 7035-01-647-4222
NSN 5920-01-531-1927
NSN 5910-01-539-5171
NSN 5835-01-199-5902
NSN 6130-00-279-8552
NSN 5855-00-455-6070
NSN 5999-01-247-2342