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 6110-00-144-6763
NSN 5835-01-510-1873
NSN 6620-01-167-0881
NSN 5930-01-106-3949
NSN 5999-01-428-7793
NSN 5920-01-069-2992
NSN 5990-00-173-2816
NSN 2925-01-043-9786
NSN 6685-01-287-6181
NSN 5895-01-339-3889
NSN 6220-00-718-6128
NSN 5975-01-217-6001