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 6645-01-500-5611
NSN 5935-01-285-2451
NSN 5855-01-279-9938
NSN 5945-00-013-0397
NSN 6620-01-271-8984
NSN 5990-01-263-0362
NSN 5835-00-233-6327
NSN 5835-01-087-1673
NSN 2925-01-620-6812
NSN 5999-01-264-6265
NSN 4140-01-553-4614
NSN 6610-00-410-8968