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 5910-01-474-4555
NSN 5910-01-052-1193
NSN 7035-01-550-2461
NSN 6240-01-385-5756
NSN 5998-01-519-9273
NSN 5950-00-354-3316
NSN 5855-00-911-1370
NSN 7035-00-111-4389
NSN 5985-01-036-6314
NSN 5930-01-340-9775
NSN 5950-01-422-6512
NSN 6240-00-696-0249