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 5915-01-455-1358
NSN 6145-01-211-6591
NSN 6620-01-053-6650
NSN 6650-01-061-2750
NSN 5950-01-535-3560
NSN 6130-01-283-2548
NSN 5920-01-160-6050
NSN 6105-01-350-6643
NSN 5905-01-339-9549
NSN 6130-00-233-3548
NSN 5999-01-588-0226
NSN 2925-01-282-3206