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 6150-01-105-2829
NSN 5975-01-337-2961
NSN 5925-01-048-5394
NSN 6645-00-144-4868
NSN 5945-00-679-9554
NSN 5999-01-642-6481
NSN 5855-00-131-6338
NSN 6135-01-128-5358
NSN 6220-01-451-3056
NSN 6130-00-216-9214
NSN 5985-01-014-4924
NSN 4140-00-555-3856