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 3/4 in Inside Diameter 0.813 in Outside Diameter 1 15/32 in Maximum Thickness 0.134 in System of Measurement Inch Minimum Thickness 0.134 in Color Yellow Material Quality Standards ASTM F436 Pack Size Small Pack Rockwell Hardness 38HRC Thickness Tolerance +0.026/-0.026 in Package Quantity 20