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 6145-00-234-8177
NSN 5999-01-157-9922
NSN 7035-00-205-8739
NSN 5905-01-313-0915
NSN 5935-00-928-8221
NSN 5999-01-383-6118
NSN 5835-01-056-9303
NSN 5910-00-629-8345
NSN 6220-01-056-5169
NSN 5895-01-014-7053
NSN 5925-01-436-4943
NSN 6135-00-613-1068