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 6610-01-111-9689
NSN 5905-01-316-9995
NSN 6610-00-611-8635
NSN 6145-01-129-4580
NSN 6610-01-103-4627
NSN 5855-01-521-7133
NSN 6110-01-093-4070
NSN 6620-01-583-8155
NSN 6130-01-440-4679
NSN 5915-01-631-7144
NSN 6320-01-558-8844
NSN 5965-00-246-5612