Machinery's Handbook, 31st Edition
1694
Washers Table 1a. American National Standard Type A Plain Washers— Preferred Sizes ANSI/ASME B18.21.1-2009 (R2016) Nominal Washer Size a Series Inside Diameter Outside Diameter Thickness Basic Tolerance Basic Tolerance Basic Max. Min. Plus Minus Plus Minus No. 0 — 0.078 0.000 0.005 0.188 0.000 0.005 0.020 0.025 0.016 No. 2 — 0.094 0.000 0.005 0.250 0.000 0.005 0.020 0.025 0.016 No. 4 — 0.125 0.008 0.005 0.312 0.008 0.005 0.032 0.040 0.025 No. 6 0.138 0.156 0.008 0.005 0.375 0.015 0.005 0.049 0.065 0.036 No. 8 0.164 0.188 0.008 0.005 0.438 0.015 0.005 0.049 0.065 0.036 No. 10 0.190 0.219 0.008 0.005 0.500 0.015 0.005 0.049 0.065 0.036 3 ∕ 16 0.188 0.250 0.015 0.005 0.562 0.015 0.005 0.049 0.065 0.036 No. 12 0.216 0.250 0.015 0.005 0.562 0.015 0.005 0.065 0.080 0.051 1 ∕ 4 0.250 N 0.281 0.015 0.005 0.625 0.015 0.005 0.065 0.080 0.051 1 ∕ 4 0.250 W 0.312 0.015 0.005 0.734 b 0.015 0.007 0.065 0.080 0.051 5 ∕ 16 0.312 N 0.344 0.015 0.005 0.688 0.015 0.007 0.065 0.080 0.051 5 ∕ 16 0.312 W 0.375 0.015 0.005 0.875 0.030 0.007 0.083 0.104 0.064 3 ∕ 8 0.375 N 0.406 0.015 0.005 0.812 0.015 0.007 0.065 0.080 0.051 3 ∕ 8 0.375 W 0.438 0.015 0.005 1.000 0.030 0.007 0.083 0.104 0.064 7 ∕ 16 0.438 N 0.469 0.015 0.005 0.922 0.015 0.007 0.065 0.080 0.051 7 ∕ 16 0.438 W 0.500 0.015 0.005 1.250 0.030 0.007 0.083 0.104 0.064 1 ∕ 2 0.500 N 0.531 0.015 0.005 1.062 0.030 0.007 0.095 0.121 0.074 1 ∕ 2 0.500 W 0.562 0.015 0.005 1.375 0.030 0.007 0.109 0.132 0.086 9 ∕ 16 0.562 N 0.594 0.015 0.005 1.156 b 0.030 0.007 0.095 0.121 0.074 9 ∕ 16 0.562 W 0.625 0.015 0.005 1.469 b 0.030 0.007 0.109 0.132 0.086 5 ∕ 8 0.625 N 0.656 0.030 0.007 1.312 0.030 0.007 0.095 0.121 0.074 5 ∕ 8 0.625 W 0.688 0.030 0.007 1.750 0.030 0.007 0.134 0.160 0.108 3 ∕ 4 0.750 N 0.812 0.030 0.007 1.469 0.030 0.007 0.134 0.160 0.108 3 ∕ 4 0.750 W 0.812 0.030 0.007 2.000 0.030 0.007 0.148 0.177 0.122 7 ∕ 8 0.875 N 0.938 0.030 0.007 1.750 0.030 0.007 0.134 0.160 0.108 7 ∕ 8 0.875 W 0.938 0.030 0.007 2.250 0.030 0.007 0.165 0.192 0.136 1 1.000 N 1.062 0.030 0.007 2.000 0.030 0.007 0.134 0.160 0.108 1 1.000 W 1.062 0.030 0.007 2.500 0.030 0.007 0.165 0.192 0.136 1 1 ∕ 8 1.125 N 1.250 0.030 0.007 2.250 0.030 0.007 0.134 0.160 0.108 1 1 ∕ 8 1.125 W 1.250 0.030 0.007 2.750 0.030 0.007 0.165 0.192 0.136 1 1 ∕ 4 1.250 N 1.375 0.030 0.007 2.500 0.030 0.007 0.165 0.192 0.136 1 1 ∕ 4 1.250 W 1.375 0.030 0.007 3.000 0.030 0.007 0.165 0.192 0.136 1 3 ∕ 8 1.375 N 1.500 0.030 0.007 2.750 0.030 0.007 0.165 0.192 0.136 1 3 ∕ 8 1.375 W 1.500 0.045 0.010 3.250 0.045 0.010 0.180 0.213 0.153 1 1 ∕ 2 1.500 N 1.625 0.030 0.007 3.000 0.030 0.007 0.165 0.192 0.136 1 1 ∕ 2 1.500 W 1.625 0.045 0.010 3.500 0.045 0.010 0.180 0.213 0.153 1 5 ∕ 8 1.625 1.750 0.045 0.010 3.750 0.045 0.010 0.180 0.213 0.153 1 3 ∕ 4 1.750 1.875 0.045 0.010 4.000 0.045 0.010 0.180 0.213 0.153 1 7 ∕ 8 1.875 2.000 0.045 0.010 4.250 0.045 0.010 0.180 0.213 0.153 2 2.000 2.125 0.045 0.010 4.500 0.045 0.010 0.180 0.213 0.153 2 1 ∕ 4 2.250 2.375 0.045 0.010 4.750 0.045 0.010 0.220 0.248 0.193 2 1 ∕ 2 2.500 2.625 0.045 0.010 5.000 0.045 0.010 0.238 0.280 0.210 2 3 ∕ 4 2.750 2.875 0.065 0.010 5.250 0.065 0.010 0.259 0.310 0.228 3 3.000 3.125 0.065 0.010 5.500 0.065 0.010 0.284 0.327 0.249 a Nominal washer sizes are intended for use with comparable nominal screw or bolt sizes. b The 0.734-inch, 1.156-inch, and 1.469-inch outside diameters avoid washers which could be Preferred sizes are for the most part from series previously designated “Standard Plate” and “SAE.” Where common sizes existed in the two series, the SAE size is designated “N” (narrow) and the Standard Plate “W” (wide). These sizes as well as all other sizes of Type A Plain Washers are to be ordered by ID, OD, and thickness dimensions. Additional selected sizes of Type A Plain Washers are shown in Table 1b. used in coin operated devices. All dimensions are in inches.
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