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 5910-01-170-5074
NSN 6610-01-522-5751
NSN 2925-00-735-4979
NSN 5975-00-135-7892
NSN 4140-01-308-0435
NSN 5965-01-285-7356
NSN 6320-01-228-2380
NSN 6220-01-057-3654
NSN 5975-01-025-2779
NSN 5998-01-447-2876
NSN 6135-01-171-9299
NSN 5910-00-781-2290