Stud end threads are national screw and mfg co /lok-thread/
A headless fastener not exceeding 12 inches (304.8 mm) in length, threaded externally on both ends with threads of the same nominal diameter. The maximum diameter of the unthreaded portion must not be greater than the nominal thread diameter plus 0.020 inches (0.508 mm). The unthreaded portion must be without locking or wrenching provisions. It may be thread relieved. See also rod, threaded end and rod, continuous thread.
NSN 5945-01-446-9221
NSN 6650-01-188-8028
NSN 5835-00-904-6272
NSN 5855-00-198-3197
NSN 5996-01-320-2301
NSN 5996-01-220-8021
NSN 5835-01-528-7454
NSN 5950-00-416-6102
NSN 4140-01-386-5630
NSN 5965-01-303-6105
NSN 5855-01-472-3963
NSN 4140-01-523-3837