Features The most common kind of round washer. Flat Washers feature 2 flat surfaces for distributing the force/stress of a nut or bolt. They also help to reduce friction and heat during the installation of a threaded fastener. Flat Washer Type / Type B Narrow Flat Washer Washer Basic Material / Stainless Steel System of Measurement / Inch Washer Material Grade / 18-8 Fastener Finish / Plain Fits Bolt Sizes / #1 Washer Inside Dia. / 5/64 in Washer Outside Dia. / 5/32 in Thickness / 0.022 in to 0.028 in Thickness Tolerance / 0.022 in to 0.028 in Color / Silver Rockwell Hardness / B70 For Use With / Softer Materials Washer Standards / ANSI B18.22.1 Package Weight / 0.001 Package Quantity / 10