Steel, aisi c1019, 2.312 in. From end of threadto center of ball, 0; 375-24 in. Thd. Class 2a, 0.375in. Di- of arm, 0.6293 in.Min, 0.6298 in. Max diameter of hole in ball, hardened tipon ball end, 1/32 in. By 45 degrees chamfer, 1.500 in. Lg of thread on arm