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 5910-01-173-7580
NSN 5910-01-536-2545
NSN 6130-00-895-8013
NSN 5945-00-781-1955
NSN 6645-01-103-8449
NSN 5960-00-489-2805
NSN 7035-01-517-1713
NSN 6150-01-167-8315
NSN 6685-01-431-7927
NSN 6610-00-907-9801
NSN 5945-01-448-9533
NSN 5985-01-165-4222