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 5935-00-966-2803
NSN 5996-01-554-9882
NSN 6150-01-154-5680
NSN 5855-01-242-8428
NSN 5905-00-469-2033
NSN 6620-01-067-0536
NSN 5895-00-927-9909
NSN 5965-01-106-4969
NSN 5996-00-110-8926
NSN 6685-00-111-7775
NSN 6105-00-202-2469
NSN 6135-00-819-8074