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 2925-01-264-1699
NSN 5910-00-059-9345
NSN 6645-01-394-7544
NSN 5905-01-634-0595
NSN 6685-01-158-5454
NSN 6685-01-430-7167
NSN 5996-01-232-0067
NSN 5915-01-245-4500
NSN 6685-01-429-8298
NSN 6220-01-295-5842
NSN 5935-01-421-5365
NSN 2925-01-314-9682