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 5945-01-568-9483
NSN 5930-01-526-5124
NSN 5999-00-988-9678
NSN 5905-01-171-9345
NSN 5965-00-653-4782
NSN 6135-01-618-8314
NSN 5975-00-758-4549
NSN 5990-01-432-4249
NSN 6610-01-335-3185
NSN 6135-00-593-6831
NSN 5985-01-050-2958
NSN 6320-00-312-7348