Machinery's Handbook, 31st Edition
Washers
1695
Table 1b. American National Standard Type A Plain Washers.— Additional Selected Sizes ANSI/ASME B18.21.1-2009 (R2016) Inside Diameter Outside Diameter Thickness
Tolerance
Tolerance
Basic 0.094 0.125 0.156 0.172 0.188 0.203 0.219 0.234 0.250 0.266 0.312 0.375 0.375 0.438 0.438 0.500 0.500 0.562 0.562 0.625 0.625 0.688 0.688 0.812 0.812 0.938 0.938 1.062 1.062 1.250 1.375 1.500 1.625 1.688 1.812 1.938 2.062
Plus
Minus 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.010 0.007 0.007 0.010 0.010 0.010 0.010 0.010 0.010
Basic 0.219 0.250 0.312 0.406 0.375 0.469 0.438 0.531 0.500 0.625 0.875 0.734 a 1.125 0.875 1.375 1.125 1.625 1.250 1.875 1.375 2.125 1.469 a 2.375 1.750 2.875 2.000 3.375 2.250 3.875 2.500 2.750 3.000 3.250 3.500 3.750 4.000 4.250
Plus
Minus 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.007 0.010 0.007 0.010 0.007 0.007 0.010 0.010 0.010 0.010 0.010 0.010
Basic 0.020 0.022 0.035 0.049 0.049 0.049 0.049 0.049 0.049 0.049 0.065 0.065 0.065 0.083 0.083 0.083 0.083 0.109 0.109 0.109 0.134 0.134 0.165 0.148 0.165 0.165 0.180 0.165 0.238 0.165 0.165 0.180 0.180 0.180 0.180 0.180 0.180
Max. 0.025 0.028 0.048 0.065 0.065 0.065 0.065 0.065 0.065 0.065 0.080 0.080 0.080 0.104 0.104 0.104 0.104 0.132 0.132 0.132 0.160 0.160 0.192 0.177 0.192 0.192 0.213 0.192 0.280 0.192 0.192 0.213 0.213 0.213 0.213 0.213 0.213
Min. 0.016 0.017 0.027 0.036 0.036 0.036 0.036 0.036 0.036 0.036 0.051 0.051 0.051 0.064 0.064 0.064 0.064 0.086 0.086 0.086 0.108 0.108 0.136 0.122 0.136 0.136 0.153 0.136 0.210 0.136 0.136 0.153 0.153 0.153 0.153 0.153
0.000 0.000 0.008 0.008 0.008 0.008 0.008 0.008 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.045 0.030 0.030 0.045 0.045 0.045 0.045 0.045
0.000 0.000 0.008 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.045 0.030 0.045 0.030 0.030 0.045 0.045 0.045 0.045 0.045 0.045
0.045 0.153 a The 0.734-inch and 1.469-inch outside diameters avoid washers which could be used in coin operated devices. All dimensions are in inches. The above sizes are to be ordered by ID, OD, and thickness dimensions. Preferred Sizes of Type A Plain Washers are shown in Table 1a. ANSI Standard Plain Washers.— The Type A plain washers were originally developed in a light, medium, heavy and extra heavy series. These series have been discontinued and the washers are now designated by their nominal dimensions. The Type B plain washers are available in a narrow, regular and wide series with propor tions designed to distribute the load over larger areas of lower strength materials. Plain washers are made of ferrous or nonferrous metal, plastic or other material as spec ified. The tolerances indicated in the tables are intended for metal washers only.
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