M10 Wing Nut - A4 Stainless Steel See Diagram for dimension key: d = 10 mm Thread Pitch - 1.5 mm D = 16.5 mm e = 36.2 mm h= 17.7 mm m = 6.8 mm A4 grade stainless steel is also known as type 316 S31.This has a greater corrosion resistance than A2 in certain environments, and is often used for Marine applications especially when coming into direct contact with salt water DIN315