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 5855-01-308-0955
NSN 5985-01-583-3013
NSN 6145-00-448-8264
NSN 5999-01-290-3745
NSN 6320-00-343-1798
NSN 6130-00-186-8460
NSN 5945-01-555-8373
NSN 6645-01-391-9820
NSN 6130-00-280-2518
NSN 6145-01-545-9926
NSN 5930-00-952-5648
NSN 6105-01-025-5981