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 6110-00-299-0260
NSN 6130-01-158-4135
NSN 6610-01-594-5362
NSN 2925-01-311-7840
NSN 5835-01-118-4690
NSN 6145-01-058-6113
NSN 6610-01-361-4193
NSN 6610-00-225-9886
NSN 5990-01-064-1013
NSN 2925-01-009-9560
NSN 6685-01-304-7157
NSN 5990-01-500-5412