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 6110-01-463-9010
NSN 5998-01-091-5973
NSN 6150-01-047-3234
NSN 6685-01-603-8849
NSN 5975-01-281-7692
NSN 5985-00-518-1748
NSN 5996-00-594-8587
NSN 2925-01-210-6531
NSN 5935-01-514-0116
NSN 6240-00-283-1263
NSN 7035-01-173-1513
NSN 5915-01-250-2451