Machinery's Handbook, 31st Edition
Washers
1697
Table 2. American National Standard Type B Plain Washers Table 2. (Continued) American National Standard Type B Plain Washers.
Inside Diameter
Outside Diameter
Thickness
Nominal Washer Size a
Tolerance
Tolerance
Series
Basic
Plus
Minus
Basic
Plus
Minus
Basic Max.
Min.
b
N 0.812 0.030 0.007 1.375 0.030 0.007 0.100 0.112 0.090 R 0.812 0.030 0.007 2.000 0.030 0.007 0.100 0.112 0.090 W 0.812 0.030 0.007 2.500 0.030 0.007 0.160 0.174 0.146 0.030 0.007 0.100 0.112 0.090 R 0.938 0.030 0.007 2.250 0.030 0.007 0.160 0.174 0.146 W 0.938 0.030 0.007 2.750 0.030 0.007 0.160 0.174 0.146 N 1.062 0.030 0.007 1.750 0.030 0.007 0.100 0.112 0.090 R 1.062 0.030 0.007 2.500 0.030 0.007 0.160 0.174 0.146 W 1.062 0.030 0.007 3.000 0.030 0.007 0.160 0.174 0.146 N 1.188 0.030 0.007 2.000 0.030 0.007 0.100 0.112 0.090 R 1.188 0.030 0.007 2.750 0.030 0.007 0.160 0.174 0.146 W 1.188 0.030 0.007 3.250 0.030 0.007 0.160 0.174 0.146 N 0.938 0.030 0.007 1.469 c N 1.312 0.030 0.007 2.250 0.030 0.007 0.160 0.174 0.146 R 1.312 0.030 0.007 3.000 0.030 0.007 0.160 0.174 0.146 W 1.312 0.045 0.010 3.500 0.045 0.010 0.250 0.266 0.234 N 1.438 0.030 0.007 2.500 0.030 0.007 0.160 0.174 0.146 R 1.438 0.030 0.007 3.250 0.030 0.007 0.160 0.174 0.146 W 1.438 0.045 0.010 3.750 0.045 0.010 0.250 0.266 0.234 N 1.562 0.030 0.007 2.750 0.030 0.007 0.160 0.174 0.146 R 1.562 0.045 0.010 3.500 0.045 0.010 0.250 0.266 0.234 W 1.562 0.045 0.010 4.000 0.045 0.010 0.250 0.266 0.234 N 1.750 0.030 0.007 3.000 0.030 0.007 0.160 0.174 0.146 R 1.750 0.045 0.010 3.750 0.045 0.010 0.250 0.266 0.234 W 1.750 0.045 0.010 4.250 0.045 0.010 0.250 0.266 0.234 N 1.875 0.030 0.007 3.250 0.030 0.007 0.160 0.174 0.146 R 1.875 0.045 0.010 4.000 0.045 0.010 0.250 0.266 0.234 W 1.875 0.045 0.010 4.500 0.045 0.010 0.250 0.266 0.234 N 2.000 0.045 0.010 3.500 0.045 0.010 0.250 0.266 0.234 R 2.000 0.045 0.010 4.250 0.045 0.010 0.250 0.266 0.234 W 2.000 0.045 0.010 4.750 0.045 0.010 0.250 0.266 0.234
0.750
3 ∕ 4
0.875
7 ∕ 8
1
1.000
1.125
1 1 ∕ 8
1.250
1 1 ∕ 4
1.375
1 3 ∕ 8
1.500
1 1 ∕ 2
1.625
1 5 ∕ 8
1.750
1 3 ∕ 4
1.875
1 7 ∕ 8
2 N 2.125 0.045 0.010 3.750 0.045 0.010 0.250 0.266 0.234 R 2.125 0.045 0.010 4.500 0.045 0.010 0.250 0.266 0.234 W 2.125 0.045 0.010 5.000 0.045 0.010 0.250 0.266 0.234 a Nominal washer sizes are intended for use with comparable nominal screw or bolt sizes. b N indicates Narrow; R, Regular; and W, Wide Series. c The 0.734-inch and 1.469-inch outside diameter avoids washers which could be used in coin operated devices. All dimensions are in inches. 2.000 Inside and outside diameters shall be concentric within at least the inside diameter tolerance. Washers shall be flat within 0.005-inch for basic outside diameters up through 0.875-inch and within 0.010 inch for larger outside diameters. For 2 1 ∕ 4 -, 2 1 ∕ 2 -, 2 3 ∕ 4 -, and 3-inch sizes see ANSI/ASME B18.21.1-2009 (R2016). American National Standard Helical Spring and Tooth Lock Washers ANSI/ASME B18.21.1-2009 (R2016).— This standard covers helical spring lock washers of carbon steel; boron steel; corrosion resistant steel, Types 302 and 305; aluminum-zinc alloy; phosphor-bronze; silicon-bronze; and K-Monel; in various series. Tooth lock washers of carbon steel having internal teeth, external teeth, and both internal and external teeth, of two constructions, designated as Type A and Type B. Washers intended for general indus- trial application are also covered. American National Standard Lock Washers (Metric Series) ANSI/ASME B18.21.2M-1999 (R2014) covers metric sizes for helical spring and tooth lock washers.
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