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 6110-01-355-4536
NSN 7035-01-602-7032
NSN 5920-00-309-5637
NSN 6645-00-884-5845
NSN 5999-00-089-4233
NSN 5930-01-015-6375
NSN 5960-01-284-9209
NSN 5905-01-406-4323
NSN 5935-01-255-5328
NSN 4140-01-435-7515
NSN 5925-01-504-4765
NSN 6645-01-326-4572