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 5915-01-167-4739
NSN 6150-01-631-3129
NSN 6685-01-082-3764
NSN 6620-00-105-3312
NSN 6240-00-215-8550
NSN 6320-00-905-0543
NSN 5996-00-500-7328
NSN 5920-00-040-2923
NSN 5855-01-337-0245
NSN 5855-01-547-9615
NSN 6135-01-100-3593
NSN 5945-01-398-4740