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 6645-01-526-8782
NSN 5999-00-846-0009
NSN 5985-00-562-0288
NSN 6240-00-468-7089
NSN 5910-00-735-1358
NSN 5920-01-483-7632
NSN 5910-01-477-4030
NSN 6130-01-010-8166
NSN 5960-01-375-6815
NSN 6220-01-443-3031
NSN 4140-00-232-1039
NSN 5910-01-284-1407