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 5895-01-308-1545
NSN 6240-00-477-3027
NSN 2925-00-720-3948
NSN 5935-01-442-9845
NSN 5990-01-282-4617
NSN 5925-01-449-9058
NSN 6645-01-498-5102
NSN 6685-01-246-1725
NSN 2925-01-087-4184
NSN 5895-01-111-1069
NSN 5855-00-149-0766
NSN 6685-01-630-9303