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 2925-01-037-5383
NSN 5996-01-439-7962
NSN 6220-00-511-3934
NSN 6130-01-090-0631
NSN 5985-00-937-1691
NSN 5999-01-361-2729
NSN 6685-01-420-4575
NSN 5935-00-546-3006
NSN 5915-01-258-5799
NSN 6240-01-040-3791
NSN 6130-01-575-5555
NSN 5905-01-534-2111