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 6620-00-891-8584
NSN 5950-01-512-0544
NSN 6105-01-233-7881
NSN 5905-00-221-8364
NSN 6220-01-307-5121
NSN 5996-00-883-2051
NSN 6320-01-618-7800
NSN 5895-00-157-8232
NSN 2925-01-656-8217
NSN 7035-01-380-6538
NSN 5925-00-229-8024
NSN 5895-01-454-7625