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 6650-01-371-2356
NSN 5930-01-139-3896
NSN 5996-01-410-8538
NSN 5930-01-353-4149
NSN 6610-01-541-5034
NSN 5925-00-930-8948
NSN 6610-01-207-0045
NSN 5960-01-143-1202
NSN 5985-01-482-4866
NSN 6320-00-371-8335
NSN 7035-01-438-2108
NSN 4140-01-421-4045