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 6105-01-659-7690
NSN 5915-00-757-9875
NSN 6110-00-513-7677
NSN 5999-00-486-0490
NSN 6645-00-978-2575
NSN 5855-00-089-3974
NSN 6135-00-715-4001
NSN 5910-00-132-0404
NSN 5895-01-316-1664
NSN 4140-01-333-0792
NSN 5905-00-395-2970
NSN 5960-00-099-9790