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 6320-00-270-8222
NSN 5925-01-432-5174
NSN 5910-01-310-7585
NSN 5998-00-948-6957
NSN 6645-00-300-0401
NSN 5855-01-254-3041
NSN 5915-01-449-1457
NSN 6145-01-453-7015
NSN 7035-01-281-3642
NSN 6130-01-411-7452
NSN 2925-01-290-8208
NSN 6135-01-593-9256