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 5990-01-582-1977
NSN 5925-00-644-5546
NSN 6320-00-139-1090
NSN 6320-01-426-8947
NSN 6650-01-145-5173
NSN 5999-00-001-8600
NSN 2925-00-221-8529
NSN 5915-01-113-1576
NSN 6220-01-506-6066
NSN 5895-00-941-2960
NSN 5855-01-130-1501
NSN 5930-00-292-1089