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 5950-01-512-2430
NSN 6220-01-160-7249
NSN 5895-00-276-7916
NSN 6240-01-327-4021
NSN 6110-01-170-4263
NSN 6145-01-629-5342
NSN 5990-01-386-5561
NSN 6620-00-145-8232
NSN 5960-01-057-4058
NSN 5905-01-382-9671
NSN 6320-01-386-3491
NSN 6610-01-560-9461