Sealing Washer Sealing Washer Type Metal Bonded Washer Finish Cadmium Plated Metal Material Steel Material Grade/Class Not Graded For Screw Size M50 Inside Diameter 50.8 mm Outside Diameter 63.5 mm Maximum Thickness 3.4 mm Seal Material Buna-N System of Measurement Metric Pack Size Small Pack Maximum Temperature 220 Degrees F Minimum Temperature -40 Degrees F Minimum Thickness 3.4 mm Seal Material Color Silver/Gold Thickness Tolerance +/-0.20 mm