Ambs Imperial (U.s.) Bolts Torque Tightening Chart
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1
2TIGHTENING TORQUES FOR IMPERIAL (U.S.) BOLTS
80%
of yield strength (Sy)
IMPÉRIAL
Diameter (in)
0.25
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
(U.S.)
1/4"
5/16"
3/8"
7/16"
1/2"
9/16"
5/8"
3/4"
7/8"
1"
1 1/8"
1 1/4"
1 3/8"
1 1/2"
1 5/8"
1 3/4"
1 7/8"
2"
2 1/4"
2 1/2"
2 3/4"
3"
20
18
16
14
13
12
11
10
9
8
7
7
6
6
5
5
4.5
4.5
4.5
4
4
4
NO. THREADS / IN (NC)
STRESS AREA (As) in in²
0.032
0.052
0.077
0.106
0.142
0.182
0.226
0.334
0.462
0.606
0.763
0.969
1.155
1.405
1.606
1.899
2.160
2.498
3.248
3.999
4.934
5.967
TIGHTENING TORQUE in Lbs·ft
Multiply by 1.356 to obtain N*m
MATERIAL
Sy (KSI)
LUBR.
µ
NL
4
8
14
22
34
49
68
120
194
291
412
581
762
1012
1253
1596
1944
2398
3507
4799
6513
8593
GRADE 1
36
0.20
C
L
3
6
10
17
26
37
51
90
145
218
309
436
572
759
940
1197
1458
1799
2631
3599
4885
6445
36
0.15
O
NL
6
12
22
35
54
78
107
191
N/A
GRADE 2
57
0.20
A
NL
N/A
194
291
412
581
762
1012
1253
1596
1944
2398
3507
4799
6513
8593
36
0.20
R
L
5
9
17
27
40
58
81
143
N/A
57
0.15
S
L
N/A
145
218
309
436
572
759
940
1197
1458
1799
2631
3599
4885
6445
36
0.15
E
NL
10
20
36
57
87
126
173
308
496
743
1053
1486
1948
2586
3202
4077
4969
6129
8964
12263
16644
21960
GRADE 5
92
0.20
L
7
15
27
43
65
94
130
231
372
557
790
1114
1461
1939
2402
3058
3727
4597
6723
9197
12483
16470
GRADE 5.2
92
0.15
T
NL
12
25
45
71
109
157
217
385
619
929
1317
1857
2435
3232
4003
5097
6211
7661
11205
15329
20805
27450
GRADE 7
115
0.20
H
L
9
19
33
53
82
118
162
288
465
697
987
1393
1826
2424
3002
3823
4658
5746
8403
11497
15604
20587
115
0.15
T
NL
14
28
50
81
123
177
245
435
700
1050
1488
2100
2752
3654
4525
5762
7021
8661
12666
17328
23519
31030
GRADE 8
130
0.20
H
L
10
21
38
60
92
133
184
326
525
787
1116
1575
2064
2740
3393
4321
5266
6495
9499
12996
17639
23273
130
0.15
R
NL
9
18
31
50
77
111
153
271
436
654
927
1308
1715
2277
N/A
ASTM A449
81
0.20
E
NL
N/A
2019
2571
3132
3864
5651
7731
10493
13844
58
0.20
A
L
6
13
24
38
57
83
114
203
327
491
696
981
1286
1707
N/A
81
0.15
D
L
N/A
1514
1928
2349
2898
4238
5798
7870
10383
58
0.15
NL
14
28
50
81
123
177
245
435
700
1050
1488
2100
2752
3654
4525
5762
7021
8661
12666
17328
23519
31030
ASTM A490
130
0.20
L
10
21
38
60
92
133
184
326
525
787
1116
1575
2064
2740
3393
4321
5266
6495
9499
12996
17639
23273
130
0.15
NL
4
8
14
22
34
49
68
120
194
291
412
581
762
1012
1253
1596
1944
2398
3507
4799
6513
8593
ASTM A36
36
0.20
L
3
6
10
17
26
37
51
90
145
218
309
436
572
759
940
1197
1458
1799
2631
3599
4885
6445
36
0.15
NL
5
10
17
28
43
61
85
151
242
363
515
727
953
1265
1566
1994
2430
2998
4384
5998
8141
10741
AISI 1045
45
0.20
L
4
7
13
21
32
46
64
113
182
273
386
545
715
949
1175
1496
1823
2248
3288
4499
6106
8056
45
0.15
NL
6
13
24
38
58
83
115
204
329
493
698
985
1292
1714
2123
2704
3294
4064
5943
8131
11036
14560
AISI 4140
61
0.20
L
5
10
18
28
43
62
86
153
246
370
524
739
969
1286
1592
2028
2471
3048
4457
6098
8277
10920
61
0.15
28
24
24
20
20
18
18
16
14
14
12
12
12
12
12
12
12
12
12
12
12
12
NO. THREADS / IN (NF)
STRESS AREA (As) in in²
0.036
0.058
0.088
0.119
0.160
0.203
0.256
0.373
0.509
0.680
0.856
1.073
1.315
1.581
1.872
2.187
2.527
2.892
3.694
4.595
5.594
6.691
TIGHTENING TORQUE in Lbs·ft
Multiply by 1.356 to obtain N*m
MATERIAL
Sy (KSI)
LUBRIFIC
µ
NL
4
9
16
25
38
55
77
134
214
326
462
644
868
1138
1460
1837
2274
2776
3990
5514
7384
9635
GRADE 1
36
0.20
F
L
3
7
12
19
29
41
58
101
160
245
347
483
651
854
1095
1378
1706
2082
2992
4136
5538
7226
36
0.15
I
NL
7
14
25
39
61
87
122
213
N/A
GRADE 2
57
0.20
N
NL
N/A
214
326
462
644
868
1138
1460
1837
2274
2776
3990
5514
7384
9635
36
0.20
E
L
5
10
19
30
46
65
91
159
N/A
57
0.15
L
N/A
160
245
347
483
651
854
1095
1378
1706
2082
2992
4136
5538
7226
36
0.15
T
NL
11
22
40
64
98
140
196
343
547
834
1181
1645
2217
2909
3731
4695
5813
7094
10196
14092
18871
24623
GRADE 5
92
0.20
H
L
8
17
30
48
74
105
147
257
410
625
886
1234
1663
2182
2798
3522
4359
5321
7647
10569
14153
18468
GRADE 5.2
92
0.15
R
NL
16
31
57
90
139
198
277
485
773
1178
1669
2325
3133
4111
5272
6635
8213
10025
14408
19912
26665
34794
GRADE 8
130
0.20
E
L
12
24
43
68
104
148
208
364
580
884
1251
1744
2350
3083
3954
4976
6160
7518
10806
14934
19999
26096
130
0.15
A
NL
10
20
36
56
86
123
173
302
481
734
1040
1448
1952
2561
N/A
ASTM A449
81
0.20
D
NL
N/A
2352
2960
3664
4472
6428
8884
11897
15523
58
0.20
L
7
15
27
42
65
92
130
227
361
551
780
1086
1464
1921
N/A
81
0.15
L
N/A
1764
2220
2748
3354
4821
6663
8922
11643
58
0.15
NL
16
31
57
90
139
198
277
485
773
1178
1669
2325
3133
4111
5272
6635
8213
10025
14408
19912
26665
34794
ASTM A490
130
0.20
L
12
24
43
68
104
148
208
364
580
884
1251
1744
2350
3083
3954
4976
6160
7518
10806
14934
19999
26096
130
0.15
NL
4
9
16
25
38
55
77
134
214
326
462
644
868
1138
1460
1837
2274
2776
3990
5514
7384
9635
ASTM A36
36
0.20
L
3
7
12
19
29
41
58
101
160
245
347
483
651
854
1095
1378
1706
2082
2992
4136
5538
7226
36
0.15
NL
5
11
20
31
48
69
96
168
267
408
578
805
1085
1423
1825
2297
2843
3470
4987
6893
9230
12044
AISI 1045
45
0.20
L
4
8
15
23
36
51
72
126
201
306
433
604
813
1067
1369
1722
2132
2603
3740
5169
6923
9033
45
0.15
NL
7
15
27
42
65
93
130
228
363
553
783
1091
1470
1929
2474
3113
3854
4704
6761
9343
12512
16326
AISI 4140
61
0.20
L
6
11
20
32
49
70
98
171
272
415
587
818
1103
1447
1855
2335
2891
3528
5070
7007
9384
12245
61
0.15
Lubrication : NL = Non-lubricated
L = Lubricated or New
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
C:\Documents and Settings\Alain\Mes documents\Couple de serrage.xls, 03.05.23 by A.S.
Sy = yield strength, in KSI
µ = Friction coefficient
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.
39, de la Baie, Granby, QC, J2G 8C8
Tél. (450) 378-6963, Téléc. (450) 378-9421, Courriel : alain.scuvee@abms.ca, Internet :
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