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 6135-00-334-4500
NSN 5945-01-560-5150
NSN 6645-00-958-5299
NSN 6130-00-963-1380
NSN 6610-01-406-1601
NSN 5945-00-359-5509
NSN 6645-01-144-6415
NSN 5960-01-473-9203
NSN 6320-01-359-3921
NSN 5920-01-252-8660
NSN 6685-01-586-2037
NSN 5996-00-932-5301