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 2925-01-129-1261
NSN 5920-01-082-7497
NSN 6320-01-428-9205
NSN 5999-00-120-0206
NSN 6220-01-013-0297
NSN 6685-01-229-6512
NSN 5895-01-135-0728
NSN 2925-01-384-4139
NSN 5855-01-578-8733
NSN 5930-01-657-4529
NSN 6130-01-347-6840
NSN 5985-01-623-8194