Coefficients C, K, K₁,8/πKC3 for calculation of cylindrical coil springs
Taken from CB 1239- 2000
Table 12-2-20 calculation of cylindrical coil springs
| C | K | K₁ | 8/πKC3 | C | K | K₁ | 8/πKC3 |
| 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 |
1.746 1.705 1.669 1.636 1.607 1.58 1.556 1.533 1.512 1.493 1.476 1.459 1.444 1.43 1.416 1.404 1.392 1.381 1.37 1.36 1.351 1.342 1.334 1.325 1.318 1.311 1.304 1.297 1.29 1.284 1.279 1.273 1.267 1.262 1.257 1.253 1.248 1.243 1.239 1.235 1.231 1.227 1.223 1.22 |
1.25 1.2 1.19 1.17 1.15 1.14 |
69.46 76.31 83.64 91.44 99.8 108.63 118.02 127.9 138.34 149.42 161.14 173.34 186.24 199.78 213.88 228.81 244.26 260.49 277.32 295.01 313.47 332.63 352.66 373.09 394.83 417.3 440.4 464.34 489.03 514.84 541.85 569.27 579.36 627.01 657.38 689.13 721.25 754.26 788.74 824.39 800.78 898.14 936.45 976.75 |
6.9 7 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 8 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 8.9 9 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9 10 10.1 10.2 10.3 10.4 10.5 10.6 10.7 10.8 10.9 11 11.1 11.2 |
1.216 1.213 1.21 1.206 1.203 1.2 1.197 1.195 1.192 1.189 1.187 1.184 l.182 1.179 1.177 1.175 1.172 1.17 1.168 1.166 1.164 1.162 1.16 1.158 1.157 1.155 1.153 1.151 1.15 1.147 l.146 1.145 1.143 1.142 1.14 l.139 1.138 1.136 l.135 l.133 l.132 l.131 1.13 1.128 |
1.13 1.12 1.11 1.1 1.09 1.08 |
1017.1 1059.5 1102.6 1146.1 1191.6 1238 1285.9 1335.5 1385.7 1436.6 1490.2 1543.5 1599.4 1655 1713.5 1773.4 1832.5 1894.9 1958.1 2023.2 2089.5 2156.7 2225.7 2296.2 2369.3 2442.6 2517.3 2592.6 2672.3 2751.3 2830.9 2915.2 2998.6 3086 3171.5 3262.1 3354.3 3444.4 3539.9 3634 3732.8 3833.2 3934.4 4034.9 |
| C | K | K₁ | 8/πKC3 | C | K | K₁ | 8/πKC3 |
| 11.3 11.4 11.5 11.6 11.7 11.8 11.9 12 12.1 12.2 12.3 12.4 12.5 12.6 12.7 12.8 12.9 13 13.1 13.2 13.3 13.4 13.5 13.6 |
1.127 1.126 1.125 1.124 1.123 1.122 1.121 1.12 1.118 1.117 1.116 1.115 1.114 1.114 1.113 1.112 1.111 1.11 1.109 1.108 |
1.07 | 4140.5 4247.9 4355.8 4466.6 4579.3 4693.8 4810.1 4928.3 5042.6 5164.3 5287.8 5413.3 5539.1 5673.1 5804.3 5937.4 6072.5 |
13.7 13.8 13.9 14 14.1 14.2 14.3 14.4 14.5 14.6 14.7 14.8 14.9 15 15.1 15.2 15.3 15.4 15.5 15.6 15.7 15.8 15.9 16 |
1.104 1.103 1.102 1.102 1.101 1.1 1.099 1.099 1.098 1.097 1.097 1.096 1.095 1.095 1.094 1.093 1.093 1.092 1.091 1.091 1.09 1.09 1.089 1.088 |
1.06 1.05 |
7228.6 7379.6 7534.8 7698.6 7858 8019.5 8183.1 8360 8523.9 8691.6 8871.4 9045.9 9222.6 9406.5 9590.7 9774.1 9968.2 10153.3 10344.9 10546.4 10742 10949.4 11146.5 11345.9 |
