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6 % * ( % + Thread diameter of bolt (a)(mm) Width across flats (b)(mm) · · Tighten·ing torque · Target value Service limit Nm kgfm lbft Nm kgfm lbft 10 13 17 19 22 13.2 31 66 113 177 1.35 3.2 6.7 11.5 18 9.8 23.1 48.5 83.2 130.2 11.8-14.7 27-34 59-74 98-123 157-196 1.2-1.5 2.8-3.5 6.0-7.5 10.0-12.5 16.0-20.0 16 18 20 22 24 24 27 30 32 36 279 382 549 745 927 28.5 39 56 76 94.5 206.1 282.1 405.0 549.7 683.5 245-309 343-425 490-608 662-829 824-1030 25.0-31.5 35.0-43.5 50.0-62.0 67.5-84.5 84.0-105.0 180.8-227.8 253.2-314.6 361.7-448.4 488.2-611.2 607.6-759.5 27 30 33 36 39 41 46 50 55 60 1320 1720 2210 2750 3280 135.0 175.0 225.0 280.0 335.0 976.5 1265.8 1627.4 2025.2 2423.1 1180-1470 1520-1910 1960-2450 2450-3040 2890-3630 120.0-150.0 155.0-195.0 200.0-250.0 250.0-310.0 295.0-370.0 868.0-1085.0 1121.1-1410.4 1446.6-1808.3 1808.3-2242.2 2133.7-2676.2 Thread diameter a (mm) Width across flats b (mm) · · Tighte·ning torque · Target value Permissible range Nm kgfm lbft Nm kgfm lbft 14 14.7 1.5 10.8 12.7 - 16.7 1.3 - 1.7 14 19 29.4 3.0 21.7 27.5 - 39.2 2.8 - 4.0 20.3 - 28.9 18 24 78.5 8.0 57.9 58.8 - 98.1 6.0 - 10.0 43.4 - 72.3 22 27 117.7 12.0 86.6 88.3 - 137.3 9.0 - 14.0 65.1 - 101.3 24 32 147.1 15.0 108.5 117.7 - 176.5 12.0 - 18.0 86.8 - 130.2 30 36 215.7 22.0 159.1 176.5 - 245.2 18.0 - 25.0 130.2 - 180.8 33 41 255.0 26.0 188.1 215.7 - 284.4 22.0 - 29.0 159.1 - 209.8