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 5835-00-804-0569
NSN 6645-01-128-6932
NSN 5945-01-121-8080
NSN 5998-01-229-6329
NSN 5855-00-532-0025
NSN 5925-01-269-2210
NSN 6150-01-381-2965
NSN 6650-00-885-3775
NSN 5996-01-265-5150
NSN 7035-01-484-2709
NSN 6135-01-546-4588
NSN 5950-00-971-8993