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 6135-01-130-3145
NSN 6105-01-550-8842
NSN 2925-01-172-9209
NSN 4140-00-189-0235
NSN 6650-01-350-5578
NSN 5975-01-422-4710
NSN 6650-01-146-5000
NSN 5895-01-170-8310
NSN 5930-01-458-4480
NSN 6610-00-186-9180
NSN 6240-01-463-2997
NSN 5990-01-434-3469