tension nut material:ductile iron 65-45-12 tapped thread:3/4-10 5/8- ... finish:plain tension nut1)Material: stainless steel, alloy steel, grey iron, ductile iron, brass, bronze, and other special steel materials.2) Usage ... -galvanized, sandblasting, painting, powder-coating.7) Accuracy±0.01mm ductile iron tension nut