3b thread class right-hand 1.062" thread length 1.437" overall length 90000.000 pounds per square inch tensile strength rating head-counterbored at 1.406 in. dia by 0.206 in. deep; head-internal recess, to accomodate packing, 0.190 in.w by 0.206 in. deep; shank-internal chamfer at thd entrance 0.045 in. by 45 deg hexagon, internal thread, shouldered