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 5960-00-468-5353
NSN 5950-00-547-2643
NSN 5910-01-186-5604
NSN 5915-01-448-9399
NSN 5925-01-364-0771
NSN 5855-01-340-6541
NSN 6220-00-234-8257
NSN 6320-01-585-8468
NSN 6145-01-290-4883
NSN 5930-01-018-7320
NSN 5945-00-160-6189
NSN 5905-01-007-7038