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 5996-01-283-3409
NSN 5965-01-360-0454
NSN 6620-01-475-8696
NSN 6150-01-088-7643
NSN 5905-00-096-2931
NSN 6685-01-556-9735
NSN 5920-01-346-8597
NSN 6110-01-410-7637
NSN 5950-01-086-3616
NSN 7035-00-003-7518
NSN 7035-01-468-6532
NSN 5895-01-329-6881