... 10 ASTM Standard: according to custome square steel hot forged nuts1)Material: stainless steel, alloy steel, ... , engineering machinery, agricultural equipment, construction, electric appliance, military equipment, etc.3) Standard: according to the dimension tolerance ... rust-prevented), zinc-plated, nickel-plated, chrome-plated, hot-galvanized, sandblasting, painting, powder-coating.7) Accuracy±0. ...