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 6145-01-542-5353
NSN 6645-01-290-9428
NSN 6685-01-177-1460
NSN 5999-01-406-1547
NSN 7035-01-561-8738
NSN 5950-01-421-4138
NSN 6685-00-116-8073
NSN 6240-01-454-7108
NSN 5990-00-351-5479
NSN 6130-01-490-6115
NSN 6145-00-020-6708
NSN 5990-00-042-3413