Quick view M39 Flat Washers, DIN 125 Type B / ISO 7090, Steel The nominal diameter is the bolt size to use for this flat washer.Diameter (Nominal): M39Inside Diameter (Nominal): 40mmOutside Diameter (Nominal): 72mmThickness (Nominal): 6mmProduct Class: WashersOrder: Flat WashersCategory: Standard Flat... $185.33 Select Quantity Compare