M3 A4 Stainless steel FLAT WASHER DIN125 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 Manufactured to the Din 125 standard Full dimensions: where d1 = inside diameter (hole size), d2=outside diameter (full diameter of whole piece), s=material thickness D1 = 3.2 D2 = 7 S = 0.5 DIN125
