Extra Thick Washer, Flat Washer Type Standard, Material Brass, Material Grade/Class Grade 2, Finish Plain, For Screw Size 1 in, Inside Diameter 1.031 in, Outside Diameter 2 in, Maximum Thickness 0.281 in, System of Measurement Inch, Minimum Thickness 0.281 in, Inside Diameter Tolerance +/-0.010 in, Material Quality Standards ASTM B16, Outside Diameter Tolerance +/-0.010 in, Pack Size Small Pack, Resistance Properties , Friction , Rust , Rockwell Hardness B50