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 6620-01-077-8033
NSN 5905-00-469-3092
NSN 6130-01-539-5316
NSN 5910-00-270-6876
NSN 6110-01-047-1330
NSN 5905-01-144-0870
NSN 6610-00-054-7276
NSN 6110-01-503-0186
NSN 6320-00-790-4844
NSN 5985-01-458-1381
NSN 7035-01-287-5094
NSN 7035-01-423-1755