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 5998-00-408-8060
NSN 5945-01-558-5006
NSN 6320-01-397-9995
NSN 5915-01-510-2296
NSN 6320-01-506-9439
NSN 6610-01-345-9040
NSN 6150-00-675-1307
NSN 7035-01-131-1168
NSN 6145-01-054-7463
NSN 5835-01-307-8954
NSN 5855-01-421-6483
NSN 5985-01-271-0797