Sealing Washer Sealing Washer Type Metal Bonded Washer Finish Cadmium Plated Metal Material Steel Material Grade/Class Not Graded For Screw Size 1/4 in Inside Diameter 0.54 in Outside Diameter 0.81 in Maximum Thickness 0.09 in Seal Material Buna-N System of Measurement Inch Pack Size Small Pack Maximum Temperature 250 Degrees F Minimum Temperature -40 Degrees F Minimum Thickness 0.08 in Seal Material Color Silver/Gold Thickness Tolerance +/-0.150 in