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 5930-01-593-4712
NSN 6110-00-757-5325
NSN 5998-01-418-2522
NSN 5985-01-152-2512
NSN 5855-01-038-2189
NSN 5895-00-788-7381
NSN 6240-00-677-0305
NSN 5996-01-058-8227
NSN 5950-00-256-6318
NSN 5975-01-157-1444
NSN 6645-01-076-4655
NSN 5905-00-078-8395