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 6620-00-912-0255
NSN 5925-01-053-3993
NSN 5998-00-269-5444
NSN 7035-01-042-0527
NSN 7035-00-166-0339
NSN 6145-00-915-0134
NSN 5985-00-775-2420
NSN 6220-01-060-9203
NSN 5945-00-081-6670
NSN 6150-00-225-3835
NSN 6620-01-015-2470
NSN 6320-01-072-2073