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 6130-01-323-1295
NSN 5965-01-337-1217
NSN 5835-00-400-5056
NSN 5925-00-100-0102
NSN 6240-01-567-1648
NSN 5835-01-392-0575
NSN 6650-01-610-0010
NSN 5965-00-147-3070
NSN 6620-01-651-1315
NSN 5925-01-371-8766
NSN 6150-00-173-3964
NSN 6220-01-351-1555