Super Ni-Cast 99% nickel special welding electrodes feature a non-conductive coating that is ideally suited for welding all grades of gray cast-iron - particularly thin sections and welds requiring the highest possible machinability. Typical applications include automotive engine blocks, transmission and pump housings. Hardness: BHN 155. Recommended Polarity: DC Reverse. Diameter (Inches): 3/32" Weight Lbs. (Kg): .5 (.22) Tensile Strength (PSI): 55,000 Amperage: 70-90