M6 Hex Nut - A4 Grade A4 grade stainless steel has a greater corrosion resistance than A2 in certain environments. It is often used for Marine applications especially when coming into direct contact with salt water Where: e = point to point m = thickness s = across flats d = Thread e - 11.05 mm (min) m - 4.7 mm (min) s - 10 d - M6 Thread Pitch - 1.0 mm DIN934