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 5950-01-566-3459
NSN 5920-01-514-4095
NSN 5985-00-865-9443
NSN 5925-00-804-5814
NSN 6620-01-183-5329
NSN 6685-01-186-7990
NSN 7035-01-088-6415
NSN 5920-00-291-1379
NSN 5999-00-952-2764
NSN 6320-00-194-4252
NSN 6320-01-556-2011
NSN 5895-01-173-1476