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 5996-00-158-5781
NSN 6240-01-401-5340
NSN 5905-01-534-4955
NSN 5910-01-261-2226
NSN 5998-01-099-9316
NSN 7035-01-643-4593
NSN 6685-00-128-1941
NSN 5855-01-120-7831
NSN 6145-01-063-8058
NSN 6110-01-654-2172
NSN 5855-00-869-3635
NSN 5855-01-272-1504