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 6130-01-596-1732
NSN 5920-00-866-3945
NSN 5835-00-170-5238
NSN 6610-01-266-8691
NSN 6645-01-007-5295
NSN 5925-00-216-8767
NSN 5835-01-182-1966
NSN 5855-01-656-6808
NSN 6610-01-200-6861
NSN 5960-01-124-8336
NSN 5990-01-417-4402
NSN 5965-01-406-4164