Flat Washer,M12 F/W 13 X 26 X 4.5-5.4 3, Dimensional Standards AMPG 2001 FL.01, Material Stainless Steel, Material Grade/Class 316, Finish Plain, For Screw Size M12, Inside Diameter 13 mm, Outside Diameter 26 mm, Maximum Thickness 5 mm, System of Measurement Metric, Minimum Thickness 4.5 mm, Inside Diameter Tolerance +/-0.010 in, Made in North America Made in North America, Material Quality Standards ASTM A276, Outside Diameter Tolerance +/-0.010 in