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 5975-00-582-1460
NSN 6610-01-545-5648
NSN 5950-00-065-8662
NSN 6620-01-642-4218
NSN 5975-01-435-2681
NSN 6145-01-046-2155
NSN 6620-01-034-4539
NSN 5999-01-431-8878
NSN 5935-01-348-8666
NSN 4140-01-065-0314
NSN 6620-01-181-1757
NSN 5930-01-522-3855