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 5975-01-362-2838
NSN 2925-00-679-8131
NSN 5855-01-088-4699
NSN 5945-00-553-9963
NSN 5945-01-104-4926
NSN 5835-01-360-2657
NSN 6135-01-101-5039
NSN 5960-00-512-9121
NSN 5950-01-567-5967
NSN 2925-00-480-9068
NSN 6610-01-406-4985
NSN 5990-01-318-3238