Ambs Imperial (U.s.) Bolts Torque Tightening Chart Page 2
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1
2TIGHTENING TORQUES FOR METRIC BOLTS
80%
of yield strength (Sy)
MÉTRIQUE
Diameter (mm)
6
8
10
12
14
16
18
20
22
24
27
30
33
36
39
42
45
48
52
56
60
64
68
M6
M8
M10
M12
M14
M16
M18
M20
M22
M24
M27
M30
M33
M36
M39
M42
M45
M48
M52
M56
M60
M64
M68
1
1.25
1.5
1.75
2
2
2.5
2.5
2.5
3
3
3.5
3.5
4
4
4.5
4.5
5
5
5.5
5.5
6
6
PITCH (mm)
STRESS AREA (As) In mm²
20
37
58
84
115
157
192
245
303
353
459
561
694
817
976
1121
1306
1473
1758
2030
2362
2676
3055
TIGHTENING TORQUE in Lbs·ft
Multiply by 1.356 to obtain N*m
MATERIAL
LUBR.
µ
Sy (MPa)
NL
3
8
16
29
46
71
98
139
189
240
351
476
648
833
1078
1333
1665
2003
2589
3220
4014
4851
5884
CLASS 4.6
240
0.20
L
3
6
12
21
34
53
74
104
142
180
263
357
486
625
808
1000
1248
1502
1942
2415
3010
3638
4413
240
0.15
S
NL
9
22
44
76
122
189
262
370
504
639
937
1270
1729
2221
2874
3556
4439
5341
6904
8586
10704
12935
15691
CLASS 8.8
640
0.20
T
L
7
17
33
57
92
142
196
277
378
479
703
953
1296
1665
2156
2667
3329
4005
5178
6439
8028
9701
11769
640
0.15
A
NL
3
7
14
25
40
62
86
121
165
210
307
417
567
729
943
1167
1456
1752
2265
2817
3512
4244
5149
STAINLESS
210
0.20
N
L
2
5
11
19
30
47
64
91
124
157
231
313
425
546
707
875
1092
1314
1699
2113
2634
3183
3862
Class 50
210
0.15
D
NL
6
16
31
54
86
133
184
260
N/A, See note 1
STAINLESS
450
0.20
A
NL
N/A, See note 1
197
250
366
496
675
867
1123
1389
1734
2086
2697
3354
4181
5053
6129
Class 70
250
0.20
R
L
5
12
23
40
64
100
138
195
N/A, See note 1
450
0.15
D
L
N/A, See note 1
148
187
274
372
506
651
842
1042
1300
1565
2023
2515
3136
3789
4597
250
0.15
NL
9
21
41
72
114
177
245
347
473
599
878
1191
1621
2082
2694
3333
4161
5007
6472
8049
10035
12126
14711
STAINLESS
600
0.20
P
L
6
16
31
54
86
133
184
260
354
449
659
893
1215
1561
2021
2500
3121
3755
4854
6037
7526
9095
11033
Class 80
600
0.15
I
NL
4
9
17
30
48
74
102
144
197
250
366
496
675
867
1123
1389
1734
2086
2697
3354
4181
5053
6129
ASTM A36
250
0.20
T
L
3
6
13
22
36
55
77
108
148
187
274
372
506
651
842
1042
1300
1565
2023
2515
3136
3789
4597
250
0.15
C
NL
4
11
21
37
59
92
127
179
244
309
454
615
837
1076
1392
1722
2150
2587
3344
4159
5185
6265
7600
AISI 1045
310
0.20
H
L
3
8
16
28
44
69
95
134
183
232
340
461
628
807
1044
1292
1612
1940
2508
3119
3888
4699
5700
310
0.15
NL
6
15
29
50
80
124
172
243
331
419
615
834
1134
1457
1886
2333
2913
3505
4531
5635
7024
8488
10297
AISI 4140
420
0.20
L
4
11
22
38
60
93
129
182
248
314
461
625
851
1093
1415
1750
2185
2629
3398
4226
5268
6366
7723
420
0.15
NL
13
32
64
112
179
278
384
543
740
938
1376
1866
2539
3262
4221
5222
6519
7844
10140
12611
15721
18998
23047
CLASS 10.9
940
0.20
L
10
24
48
84
134
209
288
407
555
704
1032
1399
1904
2446
3166
3917
4889
5883
7605
9458
11791
14249
17285
940
0.15
NL
16
38
75
131
210
325
450
636
866
1098
1610
2183
2971
3817
4940
6111
7629
9179
11866
14757
18397
22232
26970
CLASS 12.9
1100
0.20
L
12
29
56
98
157
244
337
477
650
824
1208
1637
2228
2863
3705
4583
5722
6884
8899
11068
13798
16674
20227
1100
0.15
0.75
1
1
1.25
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
2
4
4
4
PITCH (mm)
STRESS AREA (As) In mm²
22
39
64
92
125
167
216
272
333
401
514
642
784
940
1110
1294
1493
1810
2010
2301
2485
2851
3242
TIGHTENING TORQUE in Lbs·ft
Multiply by 1.356 to obtain N*m
MATERIAL
LUBR.
µ
Sy (MPa)
NL
4
9
18
31
49
76
110
154
208
273
393
546
733
958
1226
1539
1902
2460
2961
3649
4223
5167
6244
CLASS 4.6
240
0.20
L
3
7
14
23
37
57
83
115
156
204
295
409
550
719
920
1155
1427
1845
2221
2737
3167
3876
4683
240
0.15
NL
10
24
49
83
132
202
294
410
553
727
1049
1455
1954
2555
3269
4105
5073
6560
7895
9731
11260
13780
16650
CLASS 8.8
640
0.20
L
7
18
37
63
99
152
220
308
415
545
787
1091
1465
1917
2452
3079
3804
4920
5921
7298
8445
10335
12487
640
0.15
F
NL
3
8
16
27
43
66
96
135
182
238
344
477
641
838
1073
1347
1664
2153
2591
3193
3695
4521
5463
STAINLESS
210
0.20
I
L
2
6
12
21
32
50
72
101
136
179
258
358
481
629
805
1010
1248
1614
1943
2395
2771
3391
4097
Class 50
210
0.15
N
NL
7
17
34
59
93
142
207
288
N/A, See note 1
STAINLESS
450
0.20
E
NL
N/A, See note 1
216
284
410
568
763
998
1277
1604
1981
2563
3084
3801
4398
5383
6504
Class 70
250
0.20
L
5
12
26
44
69
107
155
216
N/A, See note 1
450
0.15
P
L
N/A, See note 1
162
213
307
426
572
749
958
1203
1486
1922
2313
2851
3299
4037
4878
250
0.15
I
NL
9
22
46
78
123
189
276
384
519
681
983
1364
1832
2396
3065
3849
4756
6150
7402
9123
10556
12919
15609
STAINLESS
600
0.20
T
L
7
17
34
59
93
142
207
288
389
511
738
1023
1374
1797
2299
2886
3567
4613
5551
6842
7917
9689
11707
Class 80
600
0.15
C
NL
4
9
19
33
51
79
115
160
216
284
410
568
763
998
1277
1604
1981
2563
3084
3801
4398
5383
6504
ASTM A36
250
0.20
H
L
3
7
14
24
39
59
86
120
162
213
307
426
572
749
958
1203
1486
1922
2313
2851
3299
4037
4878
250
0.15
NL
5
11
24
40
64
98
142
199
268
352
508
705
946
1238
1584
1988
2457
3178
3824
4713
5454
6675
8065
AISI 1045
310
0.20
L
4
9
18
30
48
73
107
149
201
264
381
529
710
928
1188
1491
1843
2383
2868
3535
4091
5006
6049
310
0.15
NL
7
16
32
55
86
133
193
269
363
477
688
955
1282
1677
2146
2694
3329
4305
5181
6386
7389
9043
10926
AISI 4140
420
0.20
L
5
12
24
41
65
99
145
202
272
358
516
716
962
1258
1609
2021
2497
3229
3886
4789
5542
6782
8195
420
0.15
NL
15
35
72
123
193
297
432
602
813
1067
1541
2137
2870
3753
4802
6030
7450
9635
11596
14292
16538
20239
24454
CLASS 10.9
940
0.20
L
11
26
54
92
145
223
324
452
610
800
1156
1603
2152
2815
3601
4522
5588
7226
8697
10719
12404
15179
18341
940
0.15
NL
17
41
84
143
226
347
505
705
951
1249
1803
2501
3358
4392
5619
7056
8718
11275
13570
16725
19353
23684
28617
CLASS 12.9
1100
0.20
L
13
31
63
108
170
261
379
529
713
937
1352
1875
2519
3294
4214
5292
6539
8456
10178
12544
14515
17763
21462
1100
0.15
Lubrication: NL = Non-lubricated
L = Lubricated or New
As = 0.7854 * Pi * (D - (0.9382 * Pitch))^2
D = bolt diameter, in in.
F = % * Sy * As (% = % of yield strength, generally 80%)
C = F*µ*D = % * Sy * As * µ * D/1000
Sy = yield strength, in MPa
Note 1 : Stainless, class 70, Sy=250 MPa when D > 22mm
As = stress area of bolt, in mm²
P = Pitch in mm
F = tensile force, in N
C = TIGHTENING TORQUE IN N*m
µ = friction coefficient
C:\Documents and Settings\Alain\Mes documents\Couple de serrage.xls, 03.05.23 by A.S.
Notice: ABMS verify the accuracy of information we put on our website; however, errors may occur and the end user assumes all risk and liability from the use of this information.
ABMS Consultants inc., Consultant en ingénierie mécanique.
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