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    Tightening Values / Test Torques
Non Binding Bolt Tightening Torques Nm
(Newton meter)		 Wrench Test Torque as per DIN 899 (lowest guaranteed values)
Nm (1 kpm = 10 Nm)
These torques are guidline values for metric standard threads as per DIN 13 and head dimensions as per DIN 912, 931, 934, 6912, 7984 and 7990. They mean using the bolt's limit of elasticity up to 90%. A coefficient of friction of 0.14 (new bolt, with out treatment, unlubricated) was taken as a basis for the calculations.
Note: In extreme cases, such as bolts lubricated with MOS2 paste, abd with connecting elements cadmium plated on both sides, the tightening value should be reduced by approx. 20%		 No. 2, 2 A, 2 B, 1 B, 308, 7 No. 4 No. 6, 1 B, 7, 400 No. 25, 25 V No. 26 R No. 35 A, 35 B, 3112 No. 894, 895 With square sockets as per
DIN 3120
6,3 10 12,5 20 25
No. 20 No. 30,
D 30		 No. 19, D 19 No. 32, D 32 No.
D 21
Tightening Values for
Quality Class as per DIN 267
4.6 5.6 6.9 8.8 10.9 12.9
M2 0,123 0,162 0,314 0,373 0,520 0,628 4 1,90 10,4
M 2.3* 0,196 0,265 0,510 0,598 0,843 1,010 4,5 2,64 12,6
M 2.6* 0,284 0,373 0,726 0,863 1,206 1,451 5 3,55 15,1
M 3 0,441 0,588 1,128 1,344 1,883 2,256 5,5 4,64 2,32 17,8
(M 3.5) 0,677 0,902 1,736 2,060 2,893 3,481 6 17,6 7,4 5,92 17,6 2,96 20,6 23,2
M 4 1,000 1,344 2,599 3,040 4,315 5,148 7 25,2 11,4 9,12 25,2 4,56 26,8 33,2
M 5 1,916 2,648 5,099 6,031 8,483 10,200 8
9 		34,5
45,5		 16,6
23,0 		13,3
18,4		 34,5
45,5		 34,5
45,5		 6,65
9,20		 33,6
41,1 		45,5
59,9 		94,1
119,2
M 6 3,432 4,511 8,728 10,300 14,710 17,652 10 58,1 31,0 24,8 58,1 58,1 58,1 12,4 49,1 76,7 147
(M 7) 5,590 7,453 14,220 17,162 24,517 28,439 11
12		 72,7
89,1		 40,4
51,5 		32,3
41,2 		72,7
89,1		 72,7
89,1		 72,7
89,1		 16,1
20,6		 57,8
67,0 		96
118 		178
212
M 8 8,238 10,787 21,575 25,497 35,304 42,168 13
14		 107
128		 64,5
79,4 		51,6
63,5 		107
128 		107
128 		107
128 		25,8
31,7		 68,6
68,6 		141
169 		249
288
M 10
16,67		 21,575 42,168 50,014 70,608 85,317 15
16
17		 150
175
201		 96,2
115
134 		77,0
92,3
107		 150
175
201		 150
175
201		 150
175
201		 38,5
46,1
53,5		 198
225
225 		331
377
425
M 12 28,44 38,246 73,550 87,279 122,60 147,10 18
19
20		 230
261
294 		160
186
215		 128
149
172		 230
261
294 		230
261
294		 230
261
294		 64,0
74,5
86,0 		225
225
225 		477
531
569
569
-
(M 14) 45,11
 60,801 116,70 138,30 194,20 235,40 21
22
23		 330
368
408 		247
281
319		 198
225
255 		330
368
408 		330
368
408 		330
368
408 		99,0
112
127		 225
225 		569
569
569		 -
569
569
M 16 69,63 93,163 178,50 210,80 299,10 357,90 24
25
26		 451
496
544		 359
402
449 		287
322
359 		451
496
544 		451
496
544 		451
496
544 		143
161
179		 569
569
569		 569
583
624
(M 18) 95,12 127,50 245,20 289,30 411,90 490,30 27
28		 594
647 		499
552 		399
442 		594
647		 594
647		 594
647 		199
221		 569
569
 665
707
(M 20) 135,3 180,45 384,10 411,90 578,60 696,30 30 760 670 536 760 760 760 268 569 795
(M 22) 182,4 245,16 470,70 559,00 784,50 941,40 32
34		 884
1019 		804
951 		643
761 		884
1019 		884
1019 		884
1019 		321
381		 569
569		 888
984
M 24 230,5 308,91 598,20 711,00 1000 1196 36 1165 1117 894 1165 1165 1165 447 1569 1677
(M 27) 343,2 460,90 887,50 1049 1481 1775 41 1579 1442 1154 1579 1579 1579 577 1569 1910
M 30 465,8 622,72 1206 1422 2010 2403 46 2067 1816 1453 2067 2067 2067 726 1569 2143
(M 33) 632,5 848,30 1628 1932 2716 3266 50 2512 2145 1716 2512 2512 2512 858 1569 2329
M 36 814,0 1089 2099 2481 3491 4197 55 3140 2077 3140 3140 3140 1038 1569 2562
(M 39) 1059 1412 2716 3226 4531 5443 60 3849 2471 3849 3849 1235 1569 2795
M 42 1304 1746 3364 3991 5609 6727 65 4021 4021 4021 1422 2795
(M 45) 1638 2177 4207 4992 7012 8414 70 4658 4658 4658 1618 2795
M 48 1981 2638 5080 6021 8473 10150 75 5394 5394 1765 2795
(M 52) 2540 3393 6541 7747 10885 13092 80 6178 6178 1912 2795
M 56 3168 4227 8149 9650 13582 16279 85 6963 6963 2059 The test torques agreeing with one another result from the theoretical stressing limits of the square socket.
(M 60) 3932 5247 10101 11964 16867 20202 90 7845 7845
M 64 4737 6306 12160 14416 20300 24320 95 8336 8336

* These sizes are not contained in DIN ISO 272 and should thus be avoided, if possible also the sizes in brackets.

Remark : To allocate the wrench size (sizes between flats) to the bolt diameters based on the various Standards. As for the column "Wrench Test Torques as per DIN 899", it is expressly pointed out that these are minimum guarantee calues.
Bolts from M 39 in the qualities 4.6, 5.6, 6.9, 8.8, 10.9 and 12.9 are not standardised.

Please Note : Socket wrench inserts for manual tightening are unsuitable for use with impact drivers and may cause accidents.