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 5999-00-013-1310
NSN 5965-00-296-9994
NSN 4140-01-307-1405
NSN 6130-01-005-8916
NSN 5910-01-508-4213
NSN 5965-01-537-0023
NSN 5945-01-323-5787
NSN 6320-01-356-5601
NSN 4140-00-451-8374
NSN 6145-00-194-5968
NSN 6150-01-003-7806
NSN 6110-00-570-9932