**Features** *Manufactured to mechanical specification SAE J78-1979 to achieve a surface hardened up to 650 HV to prevent torque shearing under load and a core hardness of up to 400 HV for improved ductility.|*Made from C10-18 steel.|*Plated in zinc 3-5 microns.|*Full batch-traceability to the original steel mill certificate.|*Sold in one-piece strengthened laminated TIMco branded boxes for market appeal and quality recognition.|*Bar-coded to assist in sales and stock control.