SAE Washer Flat Washer Type SAE Dimensional Standards ASME B18.22.1 Type A Narrow SAE Standard Material Steel Material Grade/Class Grade 2 Finish Plain Steel For Screw Size 1 in Inside Diameter 1.109 in Outside Diameter 2 in Maximum Thickness 0.203 in System of Measurement Inch Minimum Thickness 0.203 in Inside Diameter Tolerance 1.092 to 1.122 in Outside Diameter Tolerance 1.909 in to 1.939 in Pack Size Small Pack Rockwell Hardness 38HRC Thickness Tolerance 0.185 to 0.208 in