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 5920-00-248-3038
NSN 5999-01-327-4252
NSN 7035-01-448-4740
NSN 6320-01-571-8974
NSN 5985-01-136-4577
NSN 6105-01-146-8379
NSN 6130-01-381-5671
NSN 5925-01-483-3361
NSN 5925-01-107-0426
NSN 5855-01-433-2220
NSN 5996-01-448-3929
NSN 6220-01-047-4060