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 6150-01-555-8580
NSN 5960-01-469-5874
NSN 6135-01-531-1413
NSN 6240-01-351-6729
NSN 5975-01-507-4771
NSN 5965-01-598-6114
NSN 6610-01-554-7451
NSN 5950-01-074-7523
NSN 5998-01-408-5421
NSN 5945-01-094-6343
NSN 5975-01-258-5807
NSN 5990-00-177-2924