Qualfast: M18 Squae Single Coil Sping Washe DIN 7980 Single Coil Square Section Spring Washers, Self-Colour, DIN 7980. MPN: 37200.180.001 EAN: M18 Squae Single Coil Sping Washe DIN 7980 Attributes: Box Quantity: Diameter: 26.4mm For nom. size: M18 Hole Diameter: 18.2mm Leading Standard: DIN 7980 Material: Spring Steel Surface Treatment: Plain Thickness: 3.5mm