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 5935-01-150-3631
NSN 6685-01-396-7599
NSN 6620-01-459-3971
NSN 6610-01-213-5782
NSN 6685-01-049-2963
NSN 5950-01-029-4169
NSN 7035-01-416-5910
NSN 5930-00-253-3989
NSN 5935-01-411-5370
NSN 6135-01-618-8314
NSN 5985-00-126-1104
NSN 5998-01-025-5361