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 5935-01-102-4876
NSN 5915-00-457-1016
NSN 2925-01-448-2880
NSN 6130-01-603-8375
NSN 5985-00-840-4635
NSN 6145-00-269-4271
NSN 6610-01-468-0679
NSN 6110-01-606-9749
NSN 6610-01-061-1875
NSN 5945-00-688-2550
NSN 6150-01-634-0575
NSN 5930-00-888-9865