M10 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 - 18.90 mm (min) m - 7.64 mm (min) s - 17 d - M10 Thread Pitch - 1.5 mm DIN934