Thick Washer, Flat Washer Type Standard, Material Stainless Steel, Material Grade/Class 18-8, Finish Plain, For Screw Size M3, Inside Diameter 3.2 mm, Outside Diameter 12 mm, Maximum Thickness 3 mm, System of Measurement Metric, Minimum Thickness 3 mm, Inside Diameter Tolerance +/-0.010 in, Material Quality Standards ASTM A582, Outside Diameter Tolerance +/-0.010 in, Pack Size Small Pack, Resistance Properties , , Rockwell Hardness B83