SAE Washer Flat Washer Type SAE Dimensional Standards ASME B18.22.1 Type A Narrow SAE Standard Material Steel Material Grade/Class Grade 8 Finish Zinc Yellow For Screw Size 1 1/4 in Inside Diameter 1.375 in Outside Diameter 2 1/2 in Maximum Thickness 0.165 in System of Measurement Inch Minimum Thickness 0.165 in Color Yellow Material Quality Standards ASTM F436 Pack Size Small Pack Rockwell Hardness 38HRC Thickness Tolerance +0.027/-0.029 in Package Quantity 10