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 5985-01-423-7712
NSN 5950-00-114-2624
NSN 6220-01-232-7020
NSN 6105-00-828-4178
NSN 6135-01-469-6429
NSN 5996-01-286-3806
NSN 6220-01-659-4698
NSN 6105-01-207-2729
NSN 6145-00-894-3434
NSN 5975-00-044-2101
NSN 5920-00-773-1282
NSN 6150-00-463-0862