4
Bolting
REMARKS:
Strength Grade
4.8 6.8 8.8 10.9
Min breaking
strength
392MPa 588MPa 784MPa 941MPa
Material
Q235(SS41) 35(S35C) 35CrMo(SCM3) 42CrMo(SCM4)
Thread
22 7 69 10 98 14 137 17 165
24 10 98 14 137 21 206 25 247
27 14 137 21 206 29 284 35 341
30 18 176 28 296 41 402 58 569
32 23 225 34 333 55 539 78 765
36 32 314 48 470 70 686 100 981
41 45 441 65 637 105 1029 150 1472
46 60 588 90 882 125 1225 200 1962
50 75 735 115 1127 150 1470 210 2060
55 100 980 150 1470 180 1764 250 2453
60 120 1176 180 1764 220 2156 300 2943
65 155 1519 240 2352 280 2744 390 3826
70 180 1764 280 2744 320 3136 450 4415
75 230 2254 350 3430 400 3920 570 5592
80 280 2744 420 4116 480 4704 670 6573
85 360 3528 530 5149 610 5978 860 8437
90 410 4018 610 5978 790 7742 1100 10791
95 510 4998 760 7448 900 8820
100 580 5684 870 8526 1100 10780
105 660 6468 1000 9800 1290 12642
110 750 7350 1100 10780 1500 14701
115 830 8143 1250 12250 1850 18130
120 900 8820 1400 13720 2250 22050
130 1080 10584 1650 16170 2500 24500
145 1400 13720 2050 20090
155 1670 16366 2550 24990
175 2030 19894 3050 29890
mm
1. All recommendations above are in accordance with the Germany standard (DIN).
2.The figures above represent the maximum bolt torque; the recommended torque is
12.9
1176MPa
40 GrNiMoA(SNCM)
23 225
36 363
49 480
69 680
93 911
120 1176
180 1764
240 2352
250 2450
300 2940
370 3626
470 4606
550 5390
680 6664
850 8330
1050 10290
1350 13230
14
16
18
20
22
24
27
30
33
36
39
42
45
48
52
56
60
64
68
72
76
80
85
90
100
110
120
M
KGM N.m
KGM N.m KGM N.m KGM N.m
KGM N.m
Torque values
Torque values
Torque values
Torque values Torque values
FORM 1
BOLTING TIGHTENING FORCE RECOMMENTED CHART
80% of these chart figures.
3.The recommended tightening torque is 80% of the chart figure above. For example;
for bolt M52 the strength grade is 8.8 therefore, the torque is 4704*80% = 3763Nm
4.The recommended loosening torque is 150% of the tighting torque. For example; the
tightening torque is 3763*150%(200%) = 5645(7526) Nm.
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