Table 14. (Continued) Torsion Spring Deflections
AMW Wire Gauge Decimal Equivalent a Design Stress, kpsi
24 .055 180
25 .059 178
26 .063 176
27 .067 174
28 .071 173
29 .075 171
30 .080 169
31 .085 167
32 .090 166
33 .095 164
34 .100 163
35 .106 161
36 .112 160
37 .118 158
1 ∕ 8 .125 156
3.590
4.322
5.139
6.080
7.084
8.497
10.07
11.88
13.81
16.00
18.83
22.07
25.49
29.92
Torque, pound-inch 2.941
Deflection, degrees per coil
Inside Diameter, inch
0.8125
38.38 41.14 43.91 46.67 49.44 52.20 54.97 57.73
35.54 38.09 40.64 43.19 45.74 48.28 50.83 53.38
33.06 35.42 37.78 40.14 42.50 44.86 47.22 49.58
31.42 33.65 35.88 38.11 40.35 42.58 44.81 47.04
29.61 31.70 33.80 35.89 37.99 40.08 42.18 44.27
27.83 29.79 31.75 33.71 35.67 37.63 39.59 41.55
25.93 27.75 29.56 31.38 33.20 35.01 36.83 38.64
24.25 25.94 27.63 29.32 31.01 32.70 34.39 36.08
22.90 24.58 26.07 27.65 29.24 30.82 32.41 33.99
21.55 23.03 24.52 26.00 27.48 28.97 30.45 31.94
20.46 21.86 23.26 24.66 26.06 27.46 28.86 30.27
19.19 20.49 21.80 23.11 24.41 25.72 27.02 28.33
18.17 19.39 20.62 21.85 23.08 24.31 25.53 26.76
17.14 18.29 19.44 20.59 21.74 22.89 24.04 25.19
16.09 17.17 18.24 19.31 20.38 21.46 22.53 23.60
13 ∕ 16
0.875
7 ∕ 8
0.9375 1.000 1.0625
15 ∕ 16
1
1 1 ∕ 16
1.125
1 1 ∕ 8
1.1875
1 3 ∕ 16
1.250
1 1 ∕ 4
Washburn and Moen Gauge or Size and Decimal Equivalent a
10 .135 161
9 .1483
8 .162 154
7 .177 150
6 .192 146
5 .207 143
4 .2253
3 .2437
5 ∕ 32 .1563
3 ∕ 16 .1875
7 ∕ 32 .2188
1 ∕ 4 .250 139
9 ∕ 32 .2813
5 ∕ 16 .3125
11 ∕ 32 .3438
3 ∕ 8 .375
Design Stress, kpsi 135 Torque, pound-inch 38.90 50.60 58.44 64.30 81.68 96.45 101.5 124.6 146.0 158.3 199.0 213.3 301.5 410.6 542.5 700.0 Inside Diameter, inch Deflection, degrees per coil 13 ∕ 16 0.8125 15.54 14.08 13.30 12.74 11.53 10.93 10.51 9.687 9.208 8.933 8.346 8.125 7.382 6.784 6.292 5.880 7 ∕ 8 0.875 16.57 15.00 14.16 13.56 12.26 11.61 11.16 10.28 9.766 9.471 8.840 8.603 7.803 7.161 6.632 6.189 15 ∕ 16 0.9375 17.59 15.91 15.02 14.38 12.99 12.30 11.81 10.87 10.32 10.01 9.333 9.081 8.225 7.537 6.972 6.499 1 1.000 18.62 16.83 15.88 15.19 13.72 12.98 12.47 11.47 10.88 10.55 9.827 9.559 8.647 7.914 7.312 6.808 1 1 ∕ 16 1.0625 19.64 17.74 16.74 16.01 14.45 13.66 13.12 12.06 11.44 11.09 10.32 10.04 9.069 8.291 7.652 7.118 1 1 ∕ 8 1.125 20.67 18.66 17.59 16.83 15.18 14.35 13.77 12.66 12.00 11.62 10.81 10.52 9.491 8.668 7.993 7.427 1 3 ∕ 16 1.1875 21.69 19.57 18.45 17.64 15.90 15.03 14.43 13.25 12.56 12.16 11.31 10.99 9.912 9.045 8.333 7.737 1 1 ∕ 4 1.250 22.72 20.49 19.31 18.46 16.63 15.71 15.08 13.84 13.11 12.70 11.80 11.47 10.33 9.422 8.673 8.046 a For sizes up to 26 gauge, the table values are for music wire with a modulus E of 29,500,000 psi; for sizes from 27 gauge to 1 ⁄ 8 inch diameter the table values are for music wire with a modulus of 28,500,000 psi; for sizes from 10 gauge to 1 ⁄ 8 inch diameter, the values are for oil-tempered MB with a modulus of 28,500,000 psi. For an example in the use of the table, see the example starting on page 334 . Note: Intermediate values may be interpolated within reasonable accuracy. 158 156 149 142 141 140 138 137 136
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