Quick view M12 Flat Washers, DIN 125 Type B / ISO 7090, Steel The nominal diameter is the bolt size to use for this flat washer.Diameter (Nominal): M12Inside Diameter (Nominal): 13mmOutside Diameter (Nominal): 24mmThickness (Nominal): 2.5mmProduct Class: WashersOrder: Flat WashersCategory: Standard Flat... $192.43 Select Quantity Compare