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 6145-00-409-6844
NSN 6135-01-597-7685
NSN 5975-01-097-7032
NSN 5945-01-383-7259
NSN 7035-01-026-1171
NSN 6320-01-056-1164
NSN 6150-00-858-5116
NSN 5935-00-916-8027
NSN 5990-01-426-7350
NSN 4140-00-863-6588
NSN 5930-01-213-3329
NSN 6645-01-263-3621