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 5910-00-249-6409
NSN 5996-00-959-6511
NSN 5998-01-170-4352
NSN 5835-01-498-9410
NSN 5855-01-634-0259
NSN 5990-01-416-1017
NSN 6150-00-877-3954
NSN 5895-01-279-1998
NSN 6135-01-557-3351
NSN 5925-00-356-8007
NSN 5999-01-179-4211
NSN 6220-00-244-2552