TIGHTENING TORQUES FOR IMPERIAL (U.S.) BOLTS
IMPÉRIAL
(U.S.)
Diameter (in)
NO. THREADS / IN (NC)
STRESS AREA (As) in in²
0.3125
0.375
0.4375
0.5
0.5625
0.625
0.75
0.875
1
1.125
1.25
1.375
1.5
1.625
1.75
1.875
2
2.25
2.5
2.75
3
1/4"
20
5/16"
18
3/8"
16
7/16"
14
1/2"
13
9/16"
12
5/8"
11
3/4"
10
7/8"
9
1"
8
1 1/8"
7
1 1/4"
7
1 3/8"
6
1 1/2"
6
1 5/8"
5
1 3/4"
5
1 7/8"
4.5
2"
4.5
2 1/4"
4.5
2 1/2"
4
2 3/4"
4
3"
4
0.763
0.969
1.155
1.405
1.606
1.899
0.032
0.052
0.077
0.106
Sy (KSI)
LUBR.
µ
GRADE 1
36
NL
L
0.20
0.15
4
3
8
6
14
10
22
17
NL
NL
L
L
0.20
6
12
22
35
NL
L
0.20
NL
L
0.20
NL
L
0.20
36
O
A
R
S
GRADE 2
E
GRADE 5
57
36
57
36
92
GRADE 5.2
92
T
H
GRADE 7
115
T
H
GRADE 8
R
E
A
D
ASTM A449
115
130
130
81
58
81
58
ASTM A490
130
130
ASTM A36
36
36
AISI 1045
45
45
AISI 4140
61
61
130
ASTM A36
36
4885
6445
16644
12483
21960
16470
45
33
71
53
109
82
157
118
217
162
385
288
619
465
929
697
1317
987
1857
1393
2435
1826
3232
2424
4003
3002
5097
3823
6211
4658
7661
5746
11205
8403
15329
11497
20805
15604
27450
20587
28
21
50
38
81
60
123
92
177
133
245
184
435
326
700
525
1050
787
1488
1116
2100
1575
2752
2064
3654
2740
4525
3393
5762
4321
7021
5266
8661
6495
12666
9499
17328
12996
23519
17639
31030
23273
18
31
50
77
111
153
271
N/A
114
203
N/A
436
654
927
1308
1715
2277
2019
2571
3132
3864
7731
10493
13844
327
491
696
981
1286
1707
9
NL
L
0.20
NL
L
0.20
NL
L
0.20
NL
L
0.20
6
13
24
38
57
83
1514
1928
2349
N/A
5651
N/A
2898
4238
5798
7870
10383
14
10
28
21
50
38
81
60
123
92
177
133
245
184
435
326
700
525
1050
787
1488
1116
2100
1575
2752
2064
3654
2740
4525
3393
5762
4321
7021
5266
8661
6495
12666
9499
17328
12996
23519
17639
31030
23273
4
3
8
6
14
10
22
17
34
26
49
37
68
51
120
90
194
145
291
218
412
309
581
436
762
572
1012
759
1253
940
1596
1197
1944
1458
2398
1799
3507
2631
4799
3599
6513
4885
8593
6445
5
4
10
7
17
13
28
21
43
32
61
46
85
64
151
113
242
182
363
273
515
386
727
545
953
715
1265
949
1566
1175
1994
1496
2430
1823
2998
2248
4384
3288
5998
4499
8141
6106
10741
8056
6
5
28
13
10
24
24
18
24
38
28
20
58
43
20
83
62
18
115
86
18
204
153
16
329
246
14
493
370
14
698
524
12
985
739
12
1292
969
12
1714
1286
12
2123
1592
12
2704
2028
12
3294
2471
12
4064
3048
12
5943
4457
12
8131
6098
12
11036
8277
12
14560
10920
12
0.036
0.058
0.088
0.119
0.160
0.203
0.20
0.15
36
AISI 1045
45
45
AISI 4140
61
61
Lubrication : NL = Non-lubricated
0.256
0.373
0.509
0.680
0.856
1.073
1.315
TIGHTENING TORQUE in Lbs·ft
2.892
3.694
4.595
5.594
6.691
38
29
55
41
77
58
134
101
61
87
122
213
214
160
326
245
462
347
644
483
868
651
1138
854
1460
1095
214
326
462
644
868
1138
1460
1837
1378
2274
1706
2776
2082
3990
2992
5514
4136
7384
5538
9635
7226
2274
2776
3990
5514
7384
9635
91
159
160
245
347
483
651
854
1095
1706
2082
2992
4136
5538
7226
64
48
98
74
140
105
196
147
343
257
547
410
834
625
1181
886
1645
1234
2217
1663
2909
2182
3731
2798
4695
3522
5813
4359
7094
5321
10196
7647
14092
10569
18871
14153
24623
18468
57
43
90
68
139
104
198
148
277
208
485
364
773
580
1178
884
1669
1251
2325
1744
3133
2350
4111
3083
5272
3954
6635
4976
8213
6160
10025
7518
14408
10806
19912
14934
26665
19999
34794
26096
36
56
86
123
173
302
N/A
130
227
N/A
481
734
1040
1448
1952
2561
2352
2960
3664
4472
8884
11897
15523
361
551
780
1086
1464
1921
30
11
8
22
17
40
30
0.15
16
12
31
24
NL
NL
L
L
0.20
10
20
NL
L
0.20
NL
L
0.20
NL
L
0.20
NL
L
0.20
N/A
0.15
0.20
N/A
6428
N/A
3354
4821
7
15
27
42
65
92
1764
2220
2748
6663
8922
11643
16
12
31
24
57
43
90
68
139
104
198
148
277
208
485
364
773
580
1178
884
1669
1251
2325
1744
3133
2350
4111
3083
5272
3954
6635
4976
8213
6160
10025
7518
14408
10806
19912
14934
26665
19999
34794
26096
4
3
9
7
16
12
25
19
38
29
55
41
77
58
134
101
214
160
326
245
462
347
644
483
868
651
1138
854
1460
1095
1837
1378
2274
1706
2776
2082
3990
2992
5514
4136
7384
5538
9635
7226
5
4
11
8
20
15
31
23
48
36
69
51
96
72
168
126
267
201
408
306
578
433
805
604
1085
813
1423
1067
1825
1369
2297
1722
2843
2132
3470
2603
4987
3740
6893
5169
9230
6923
12044
9033
7
6
15
11
27
20
42
32
65
49
93
70
130
98
228
171
363
272
553
415
783
587
1091
818
1470
1103
1929
1447
2474
1855
3113
2335
3854
2891
4704
3528
6761
5070
9343
7007
12512
9384
16326
12245
0.15
L = Lubricated or New
2.527
65
19
0.15
2.187
46
10
0.15
1.872
N/A
1837
N/A
1378
5
0.15
1.581
Multiply by 1.356 to obtain N*m
N/A
0.20
0.15
8593
3599
0.20
58
6513
12263
9197
NL
L
130
4799
2631
0.20
0.15
3507
8964
6723
NL
NL
L
L
0.15
2398
1799
14
10
0.15
1944
6129
4597
0.20
ASTM A490
1253
8593
6445
1458
NL
L
81
1012
6513
4885
4969
3727
39
58
762
4799
3599
4077
3058
25
81
581
3507
2631
940
14
ASTM A449
412
2398
1799
3202
2402
7
A
D
291
1944
1458
759
0.20
130
194
1596
1197
2586
1939
NL
NL
L
L
92
1253
940
572
25
19
130
1012
759
1948
1461
0.15
0.15
762
572
436
16
12
GRADE 8
191
581
436
1486
1114
9
7
GRADE 5.2
107
412
309
309
4
3
R
E
78
291
218
1053
790
0.15
36
54
194
145
218
0.20
92
120
90
743
557
NL
L
GRADE 5
68
51
145
36
T
H
49
37
496
372
25
19
0.15
5.967
308
231
12
9
0.15
4.934
173
130
GRADE 1
57
34
26
N/A
0.15
3.999
126
94
36
27
0.15
3.248
87
65
20
15
0.15
2.498
57
43
10
7
0.15
0.15
2.160
Multiply by 1.356 to obtain N*m
143
µ
36
0.606
81
27
LUBRIFIC
57
0.462
58
17
Sy (KSI)
GRADE 2
0.334
40
9
MATERIAL
I
N
E
0.226
N/A
1596
N/A
1197
5
0.15
NO. THREADS / IN (NF)
36
0.182
N/A
0.20
STRESS AREA (As) in in²
F
0.142
TIGHTENING TORQUE in Lbs·ft
MATERIAL
C
80% of yield strength (Sy)
0.25
As = 0.7854* ( D - ( 0.9743/n ))²
D = bolt diameter, in in.
F = % * Sy * As * 1000 (% = % of yield strength, generally 80%)
C = F * µ * D = % * Sy * As * µ * D * 1000 / 12
As = stress area of bolt, in in²
n = no. threads / in.
F = tensile force , in Lbs
C = TIGHTENING TORQUE, IN N*m
Sy = yield strength, in KSI
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.
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TIGHTENING TORQUES FOR METRIC BOLTS
MÉTRIQUE
Diameter (mm)
PITCH (mm)
STRESS AREA (As) In mm²
MATERIAL
Sy (MPa)
LUBR.
µ
CLASS 4.6
240
NL
L
0.20
NL
L
0.20
NL
L
0.20
NL
NL
L
L
0.20
NL
L
0.20
NL
L
0.20
NL
L
0.20
NL
L
0.20
NL
L
0.20
240
S
T
CLASS 8.8
A
N
STAINLESS
210
Class 50
210
D
STAINLESS
450
A
R
D
Class 70
250
640
640
450
250
STAINLESS
600
P
Class 80
600
I
T
ASTM A36
250
C
H
AISI 1045
250
310
310
AISI 4140
420
420
CLASS 10.9
940
940
CLASS 12.9
1100
1100
NL
L
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
µ
CLASS 4.6
240
NL
L
0.20
NL
L
0.20
NL
L
0.20
NL
NL
L
L
0.20
NL
L
0.20
NL
L
0.20
NL
L
0.20
NL
L
0.20
NL
L
0.20
NL
L
0.20
F
I
STAINLESS
210
Class 50
210
N
E
STAINLESS
450
Class 70
250
450
P
250
I
T
STAINLESS
600
Class 80
600
C
H
ASTM A36
250
250
AISI 1045
310
310
AISI 4140
420
420
CLASS 10.9
940
940
CLASS 12.9
1100
1100
Lubrication: NL = Non-lubricated
L = Lubricated or New
Note 1 : Stainless, class 70, Sy=250 MPa when D > 22mm
16
18
20
22
24
27
30
33
36
39
42
45
48
52
56
60
64
68
M6
1
M8
1.25
M10
1.5
M12
1.75
M14
2
M16
2
M18
2.5
M20
2.5
M22
2.5
M24
3
M27
3
M30
3.5
M33
3.5
M36
4
M39
4
M42
4.5
M45
4.5
M48
5
M52
5
M56
5.5
M60
5.5
M64
6
M68
6
20
37
58
84
115
157
192
245
303
353
459
561
694
817
976
1121
1306
1473
1758
2030
2362
2676
3055
8
6
16
12
29
21
46
34
71
53
98
74
139
104
189
142
240
180
351
263
476
357
648
486
833
625
1078
808
1333
1000
1665
1248
2003
1502
2589
1942
3220
2415
4014
3010
4851
3638
5884
4413
9
7
22
17
44
33
76
57
122
92
189
142
262
196
370
277
504
378
639
479
937
703
1270
953
1729
1296
2221
1665
2874
2156
3556
2667
4439
3329
5341
4005
6904
5178
8586
6439
10704
8028
12935
9701
15691
11769
3
2
7
5
14
11
25
19
40
30
62
47
86
64
121
91
165
124
210
157
307
231
417
313
567
425
729
546
943
707
1167
875
1456
1092
1752
1314
2265
1699
2817
2113
3512
2634
4244
3183
5149
3862
31
54
86
133
184
260
366
496
675
867
1123
1389
1734
2086
2697
3354
4181
5053
6129
23
40
64
100
138
195
274
372
506
651
842
1042
1300
1565
2023
2515
3136
3789
4597
9
6
21
16
41
31
72
54
114
86
177
133
245
184
347
260
473
354
599
449
878
659
1191
893
1621
1215
2082
1561
2694
2021
3333
2500
4161
3121
5007
3755
6472
4854
8049
6037
10035
7526
12126
9095
14711
11033
4
3
9
6
17
13
30
22
48
36
74
55
102
77
144
108
197
148
250
187
366
274
496
372
675
506
867
651
1123
842
1389
1042
1734
1300
2086
1565
2697
2023
3354
2515
4181
3136
5053
3789
6129
4597
4
3
11
8
21
16
37
28
59
44
92
69
127
95
179
134
244
183
309
232
454
340
615
461
837
628
1076
807
1392
1044
1722
1292
2150
1612
2587
1940
3344
2508
4159
3119
5185
3888
6265
4699
7600
5700
6
4
15
11
29
22
50
38
80
60
124
93
172
129
243
182
331
248
419
314
615
461
834
625
1134
851
1457
1093
1886
1415
2333
1750
2913
2185
3505
2629
4531
3398
5635
4226
7024
5268
8488
6366
10297
7723
13
10
32
24
64
48
112
84
179
134
278
209
384
288
543
407
740
555
938
704
1376
1032
1866
1399
2539
1904
3262
2446
4221
3166
5222
3917
6519
4889
7844
5883
10140
7605
12611
9458
15721
11791
18998
14249
23047
17285
38
29
1
75
56
1
131
98
1.25
210
157
1.5
325
244
1.5
450
337
1.5
636
477
1.5
866
650
1.5
1098
824
1.5
1610
1208
1.5
2183
1637
1.5
2971
2228
1.5
3817
2863
1.5
4940
3705
1.5
6111
4583
1.5
7629
5722
1.5
9179
6884
1.5
11866
8899
1.5
14757
11068
2
18397
13798
4
22232
16674
4
26970
20227
4
39
64
92
125
167
216
272
333
401
514
642
784
940
1110
1294
1493
1810
2010
2301
2485
2851
3242
22
0.15
0.15
0.15
0.15
N/A, See note 1
197
250
N/A, See note 1
148
187
TIGHTENING TORQUE in Lbs·ft
0.15
0.20
Multiply by 1.356 to obtain N*m
3
3
16
12
PITCH (mm) 0.75
LUBR.
640
14
0.15
STRESS AREA (As) In mm²
640
12
0.20
Sy (MPa)
CLASS 8.8
10
6
16
N/A, See note 1
5
12
N/A, See note 1
0.15
MATERIAL
240
8
TIGHTENING TORQUE in Lbs·ft
0.15
0.20
80% of yield strength (Sy)
6
4
3
9
7
18
14
31
23
49
37
76
57
110
83
154
115
208
156
273
204
393
295
546
409
733
550
958
719
1226
920
1539
1155
1902
1427
2460
1845
2961
2221
3649
2737
4223
3167
5167
3876
6244
4683
10
7
24
18
49
37
83
63
132
99
202
152
294
220
410
308
553
415
727
545
1049
787
1455
1091
1954
1465
2555
1917
3269
2452
4105
3079
5073
3804
6560
4920
7895
5921
9731
7298
11260
8445
13780
10335
16650
12487
3
2
8
6
16
12
27
21
43
32
66
50
96
72
135
101
182
136
238
179
344
258
477
358
641
481
838
629
1073
805
1347
1010
1664
1248
2153
1614
2591
1943
3193
2395
3695
2771
4521
3391
5463
4097
34
59
93
142
207
288
410
568
763
998
1277
1604
1981
2563
3084
3801
4398
5383
6504
26
44
69
107
155
216
7
17
N/A, See note 1
5
12
N/A, See note 1
0.15
0.15
0.15
0.15
0.15
0.15
Multiply by 1.356 to obtain N*m
N/A, See note 1
216
284
N/A, See note 1
162
213
307
426
572
749
958
1203
1486
1922
2313
2851
3299
4037
4878
9
7
22
17
46
34
78
59
123
93
189
142
276
207
384
288
519
389
681
511
983
738
1364
1023
1832
1374
2396
1797
3065
2299
3849
2886
4756
3567
6150
4613
7402
5551
9123
6842
10556
7917
12919
9689
15609
11707
4
3
9
7
19
14
33
24
51
39
79
59
115
86
160
120
216
162
284
213
410
307
568
426
763
572
998
749
1277
958
1604
1203
1981
1486
2563
1922
3084
2313
3801
2851
4398
3299
5383
4037
6504
4878
5
4
11
9
24
18
40
30
64
48
98
73
142
107
199
149
268
201
352
264
508
381
705
529
946
710
1238
928
1584
1188
1988
1491
2457
1843
3178
2383
3824
2868
4713
3535
5454
4091
6675
5006
8065
6049
7
5
16
12
32
24
55
41
86
65
133
99
193
145
269
202
363
272
477
358
688
516
955
716
1282
962
1677
1258
2146
1609
2694
2021
3329
2497
4305
3229
5181
3886
6386
4789
7389
5542
9043
6782
10926
8195
15
11
35
26
72
54
123
92
193
145
297
223
432
324
602
452
813
610
1067
800
1541
1156
2137
1603
2870
2152
3753
2815
4802
3601
6030
4522
7450
5588
9635
7226
11596
8697
14292
10719
16538
12404
20239
15179
24454
18341
17
13
41
31
84
63
143
108
226
170
347
261
505
379
705
529
951
713
1249
937
1803
1352
2501
1875
3358
2519
4392
3294
5619
4214
7056
5292
8718
6539
11275
8456
13570
10178
16725
12544
19353
14515
23684
17763
28617
21462
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
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.
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