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 5915-01-008-6268
NSN 4140-01-578-5240
NSN 6685-01-106-3210
NSN 6620-01-479-7221
NSN 2925-01-534-7314
NSN 5965-01-408-5990
NSN 5975-01-431-9730
NSN 6220-01-379-6692
NSN 5975-00-665-3644
NSN 6685-00-998-2754
NSN 5855-01-536-9873
NSN 5915-01-448-6622