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 6320-00-194-4252
NSN 5999-01-381-1139
NSN 5935-01-418-1795
NSN 2925-00-549-6759
NSN 6610-00-209-4372
NSN 2925-00-233-5644
NSN 5910-01-485-0154
NSN 5915-01-345-4444
NSN 5945-01-420-5891
NSN 6610-01-367-5110
NSN 6145-00-084-6035
NSN 6620-01-138-0089