Machinery's Handbook, 31st Edition
1698 Washers Helical Spring Lock Washers: These washers are used to provide: 1) good bolt tension per unit of applied torque for tight assemblies; 2) hardened bearing surfaces to create uniform torque control; 3) uniform load distribution through controlled radii—section—cut-off; and 4) protection against looseness resulting from vibration and corrosion. Nominal washer sizes are intended for use with comparable nominal screw or bolt sizes. These washers are designated by the following data in the sequence shown: Product name; nominal size (number, fraction or decimal equivalent); series; material; and protective finish, if required. For example: Helical Spring Lock Washer, 0.375 Extra Duty, Steel, Phosphate Coated. Helical spring lock washers are available in four series: Regular, heavy, extra duty and hi-collar as given in Table 2 and Table 1 . Helical spring lock washers made of materials other than carbon steel are available in the regular series as given in Table 2. Table 1. American National Standard High Collar Helical Spring Lock Washers ANSI/ASME B18.21.1-2009 (R2016) Nominal Washer Size Inside Diameter Outside Diameter Washer Section Width Thickness a Min. Max. Max. Min. Min. No. 4 0.112 0.114 0.120 0.173 0.022 0.022 No. 5 0.125 0.127 0.133 0.202 0.030 0.030 No. 6 0.138 0.141 0.148 0.216 0.030 0.030 No. 8 0.164 0.167 0.174 0.267 0.042 0.047 No. 10 0.190 0.193 0.200 0.294 0.042 0.047 1 ∕ 4 0.250 0.252 0.260 0.363 0.047 0.078 5 ∕ 16 0.3125 0.314 0.322 0.457 0.062 0.093 3 ∕ 8 0.375 0.377 0.385 0.550 0.076 0.125 7 ∕ 16 0.4375 0.440 0.450 0.644 0.090 0.140 1 ∕ 2 0.500 0.502 0.512 0.733 0.103 0.172 5 ∕ 8 0.625 0.628 0.641 0.917 0.125 0.203 3 ∕ 4 0.750 0.753 0.766 1.105 0.154 0.218 7 ∕ 8 0.875 0.878 0.894 1.291 0.182 0.234 1 1.000 1.003 1.024 1.478 0.208 0.250 1 1 ∕ 8 1.125 1.129 1.153 1.663 0.236 0.313 1 1 ∕ 4 1.250 1.254 1.280 1.790 0.236 0.313 1 3 ∕ 8 1.375 1.379 1.408 2.031 0.292 0.375 1 1 ∕ 2 1.500 1.504 1.534 2.159 0.292 0.375 1 3 ∕ 4 1.750 1.758 1.789 2.596 0.383 0.469 2 2.000 2.008 2.039 2.846 0.383 0.469 2 1 ∕ 4 2.250 2.262 2.293 3.345 0.508 0.508 2 1 ∕ 2 2.500 2.512 2.543 3.595 0.508 0.508 2 3 ∕ 4 2.750 2.762 2.793 4.095 0.633 0.633 3 3.000 3.012 3.043 4.345 0.633 0.633 a Mean section thickness = (inside thickness + outside thickness) ÷ 2.
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