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 7035-01-072-6896
NSN 6620-01-593-8738
NSN 5835-01-534-3172
NSN 5950-00-931-4079
NSN 5998-00-997-7937
NSN 6645-01-503-8211
NSN 2925-01-270-1124
NSN 4140-01-197-9883
NSN 6645-01-559-3977
NSN 5950-01-004-4695
NSN 6130-01-092-4078
NSN 6220-01-483-2098