Flat Washer Flat Washer Type Standard Dimensional Standards ASME B18.21.1 Material Stainless Steel Material Grade/Class 18-8 Finish Plain For Screw Size 1 3/8 in Inside Diameter 1.5 in Outside Diameter 3 1/4 in Maximum Thickness 0.18 in System of Measurement Inch Minimum Thickness 0.18 in Maximum Temperature 302 Degrees F Minimum Temperature -58 Degrees F Pack Size Small Pack Rockwell Hardness Not Rated Package Quantity 5