Flat Washer Flat Washer Type Standard Dimensional Standards ASME B18.21.1 Material Stainless Steel Material Grade/Class 316 Finish Plain For Screw Size 1 1/2 in Inside Diameter 1.625 in Outside Diameter 3 1/2 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 Package Quantity 5