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 6105-01-327-5419
NSN 6620-01-649-0748
NSN 6650-00-250-5183
NSN 6650-01-418-4181
NSN 6650-00-067-3572
NSN 6110-00-622-1434
NSN 5990-01-380-6121
NSN 6220-01-017-5492
NSN 5950-01-384-1959
NSN 5935-00-815-3377
NSN 5975-01-553-2795
NSN 7035-00-541-8516