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 5835-00-170-5238
NSN 6135-01-428-7490
NSN 5990-01-595-9441
NSN 5910-01-576-8402
NSN 5960-00-984-4288
NSN 5895-01-449-1839
NSN 5855-00-003-3228
NSN 5998-01-459-8580
NSN 5895-00-826-6538
NSN 5930-01-011-8700
NSN 5996-01-014-6103
NSN 5985-00-452-2228