"STEEL 4130,MIL-S-6758,150-170,000 PSI HEAT TREAT,1.920 IN. LG O/A,0.380 IN. LG,0.580 IN. W,0.500 IN. THK HEAD W/1.040 IN. LG CROSSBOLT THROUGH W,1.580 IN. LG,0.245 IN. MIN,0.250 IN. MAX DIA SHAFT,1.750 IN. DEEP,0.125 IN. DIA CENTERBORE FROM HEADED END"