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 7035-00-135-4758
NSN 6610-00-740-7103
NSN 6320-00-070-4544
NSN 5999-01-156-0408
NSN 6130-00-034-5127
NSN 5835-01-123-8305
NSN 6685-00-008-3349
NSN 6320-01-392-3531
NSN 5965-01-657-9805
NSN 6145-00-163-2861
NSN 5910-01-099-4505
NSN 5999-01-525-8704