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 6685-01-612-9572
NSN 6150-00-161-2480
NSN 6240-00-079-0112
NSN 5915-01-498-2706
NSN 5915-01-269-2587
NSN 5945-01-210-3913
NSN 5950-01-100-6784
NSN 5935-01-314-4313
NSN 5999-01-026-5319
NSN 2925-00-088-6790
NSN 5895-00-471-8752
NSN 6240-01-543-7055