Shoulder is d-shaped with center to flat 0.245-0.255 in.
A headless fastener not exceeding 12 inches (304.8 mm) in length, threaded externally on both ends with threads of the same nominal diameter. All or part of the unthreaded section has a cross-sectional diameter greater than the nominal stud size plus 0.020 inches (0.508 mm). It may be thread relieved. See also stud, locked in.
NSN 4140-00-561-9218
NSN 2925-01-408-6205
NSN 6135-01-132-6310
NSN 5925-00-060-6732
NSN 4140-01-254-3689
NSN 5935-01-142-4253
NSN 5935-01-064-4867
NSN 6650-01-320-7610
NSN 5990-01-443-2931
NSN 7035-01-372-0421
NSN 6645-01-485-3517
NSN 5835-00-491-6075