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 5985-00-934-3219
NSN 6240-00-201-1200
NSN 5835-01-247-2634
NSN 5910-00-637-2609
NSN 2925-01-376-9236
NSN 7035-00-946-2642
NSN 6320-01-556-2011
NSN 5950-01-598-7529
NSN 5905-01-409-2951
NSN 5996-01-602-6886
NSN 6645-01-010-3746
NSN 6135-01-451-2120