RECOMMENDED TORQUE VALUE CHART
Use this chart as a guideline to the correct torque to be applied to standard size metric and imperial bolts in grades 8.8 (metric) and ASTM A193 grade B7 (imperial) or similar. The torque figures are calculated in both metric (Nm] and imperial (lbf.ft) values using a choice of three commonly used bolt thread lubricants. Always consider the coefficient of friction applicable for the chosen bolt lubricant. For grade 10.9 bolts add 40% and grade 12.9 bolts add 70% to the figure detailed against the relevant 8.8 grade metric stud bolt size.
Remember these torque values are for guidance purposes only! Always check the equipment/bolt manufacturer for the actual torque required and specified for bolted components within the particular equipment design.
|
Bolt
dimeter
(see note 1)
|
Nut AF size
(see note 2)
|
Bolt tension
(see note 3)
|
Torque for specified lubricant
Nm (lbf ft.)
(see note 4)
|
|
mm
|
ins
|
mm
|
ins
|
kN
|
(lds. force)
|
Moly
(friction =0.06)
|
Cooper
(friction =0.10)
|
Machine Oil
(friction = 0.15)
|
|
16
|
|
24
|
|
60
|
(15,760)
|
102
|
(75)
|
155
|
(114)
|
184
|
(136)
|
|
5/8
|
|
1.1/16
|
67
|
(15,218)
|
99
|
(73)
|
150
|
(110)
|
179
|
(131)
|
|
3/4
|
|
1.1/4
|
96
|
(21,652)
|
175
|
(129)
|
263
|
(194)
|
314
|
(231)
|
|
20
|
|
30
|
|
99
|
(24,730)
|
202
|
(148)
|
305
|
(224)
|
363
|
(267)
|
|
7/8
|
|
1.7/16
|
134
|
(30,135)
|
277
|
(204)
|
423
|
(311)
|
501
|
(368)
|
|
24
|
|
36
|
|
159
|
(35,634)
|
346
|
(254)
|
526
|
(387)
|
621
|
(457)
|
|
1
|
|
1.5/8
|
199
|
(44,981)
|
416
|
(307)
|
631
|
(464)
|
746
|
(549)
|
|
27
|
|
41
|
|
210
|
(47,153)
|
505
|
(372)
|
774
|
(569)
|
913
|
(672)
|
|
1.1/8
|
|
1.13/16
|
261
|
(58,622)
|
629
|
(463)
|
965
|
(709)
|
1,081
|
(795)
|
|
30
|
|
46
|
|
255
|
(57,302)
|
687
|
(505)
|
1,051
|
(773)
|
1,177
|
(866)
|
|
1.1/4
|
|
2
|
329
|
(74,068)
|
872
|
(642)
|
1,348
|
(991)
|
1,505
|
(1,107)
|
|
33
|
|
50
|
|
319
|
(71,695)
|
928
|
(682)
|
1,428
|
(1,050)
|
1,592
|
(1,171)
|
|
1.3/8
|
|
2.3/16
|
407
|
(91,316)
|
1,169
|
(860)
|
1,820
|
(1,338)
|
2,026
|
(1,490)
|
|
36
|
|
55
|
|
374
|
(84,088)
|
1.198
|
(881)
|
1,837
|
(1,351)
|
2,067
|
(1,520)
|
|
1.1/2
|
|
2.3/8
|
492
|
(110,369)
|
1,526
|
(1,122)
|
2,352
|
(1,729)
|
2,654
|
(1,951)
|
|
39
|
|
60
|
|
451
|
(101,353)
|
1,546
|
(1,364)
|
2.384
|
(1,753)
|
2,646
|
(1,946)
|
|
1.5/8
|
|
2.9/16
|
584
|
(131,226)
|
1,949
|
(1,433)
|
2,388
|
(1,756)
|
2,650
|
(1,949)
|
|
42
|
|
65
|
|
517
|
(116,220)
|
1,967
|
(1,446)
|
3,037
|
(2,233)
|
3,386
|
(2,490)
|
|
1.3/4
|
|
2.3/4
|
684
|
(153,888)
|
2,444
|
(1,797)
|
3,856
|
(2,835)
|
4,301
|
(3,163)
|
|
45
|
|
70
|
|
606
|
(136,153)
|
2,388
|
(1,756)
|
3,690
|
(2,714)
|
4,096
|
(3,012)
|
|
1.7/8
|
|
2.15/16
|
793
|
(178,353)
|
3,021
|
(2,221)
|
4,781
|
(3,515)
|
5,317
|
(3.910)
|
|
48
|
|
75
|
|
680
|
(153,016)
|
2,881
|
(2,119)
|
4,444
|
(3,267)
|
4,933
|
(3,627)
|
|
2
|
|
3.1/8
|
910
|
(204,621)
|
3,676
|
(2,703)
|
5,835
|
(4,291)
|
6,482
|
(4,766)
|
|
52
|
|
80
|
|
819
|
(184,051)
|
3,690
|
(2,713)
|
5,718
|
(4,204)
|
6,347
|
(4,667)
|
|
56
|
|
85
|
|
944
|
(212,237)
|
4,578
|
(3,366)
|
7,081
|
(5,207)
|
7,860
|
(5,779)
|
|
2.1/4
|
|
3.1/2
|
1,168
|
(262,571)
|
5,250
|
(3,860)
|
8,372
|
(6,156)
|
9,297
|
(6,836)
|
|
60
|
|
90
|
|
1,105
|
(258,590)
|
5,707
|
(4,196)
|
8,838
|
(6,499)
|
9,810
|
(7,213)
|
|
2.1/2
|
|
3.7/8
|
1,458
|
(327,737)
|
7,223
|
(5,311)
|
11,561
|
(8,501)
|
12,827
|
(9,432)
|
|
64
|
|
95
|
|
1,250
|
(281,106)
|
6,835
|
(5,026)
|
10,595
|
(7,791)
|
11,760
|
(8,647)
|
|
68
|
|
100
|
|
1,435
|
(322,736)
|
8,328
|
(6,123)
|
12,961
|
(9,530)
|
14,387
|
(10,578)
|
|
2.3/4
|
|
4.1/4
|
1,611
|
(362,012)
|
8,735
|
(6,423)
|
14,031
|
(10,317)
|
15,519
|
(11,411)
|
|
72
|
|
105
|
|
1,633
|
(367,081)
|
9,820
|
(7,220)
|
15,326
|
(11,269)
|
16,935
|
(12,452)
|
|
3
|
|
4.5/8
|
1,931
|
(434,028)
|
11,343
|
(8,340)
|
18,273
|
(13,436)
|
20,226
|
(14,872)
|
|
80
|
|
115
|
|
1,870
|
(420,273)
|
12,264
|
(9,018)
|
19,251
|
(14,155)
|
21,272
|
(15,641)
|
|
3.1/4
|
|
5
|
2,280
|
(512,574)
|
14,451
|
(10,626)
|
23,335
|
(17,158)
|
25,796
|
(18,968)
|
|
3.1/2
|
|
5.3/8
|
2,659
|
(597,647)
|
18,081
|
(13,295)
|
29,257
|
(21,513)
|
32,311
|
(23,758)
|
|
90
|
|
130
|
|
2,424
|
(545,035)
|
27,654
|
(12,981)
|
27,881
|
(20,501)
|
30,809
|
(22,653)
|
|
3.3/4
|
|
5.3/4
|
3,066
|
(689,249)
|
22,252
|
(16,362)
|
36,075
|
(26,526)
|
39,834
|
(29,290)
|
|
100
|
|
145
|
|
3,050
|
(685,695)
|
24,410
|
(17,949)
|
38,742
|
(54,239)
|
42,810
|
(31,478)
|
|
4
|
|
6.1/8
|
3,503
|
(787,381)
|
27,024
|
(19,871)
|
43,883
|
(32,267)
|
48,444
|
(35,621)
|
|
4.1/4
|
|
6.1/2
|
3,133
|
(704,242)
|
25,605
|
(18,830)
|
41,647
|
(30,633)
|
45,956
|
(33,791)
|
|
4.1/2
|
|
6.7/8
|
4,146
|
(932,023)
|
30,423
|
(22,370)
|
49,538
|
(36,425)
|
54,641
|
(40,177)
|
Notes: 1 = Bolt Material Grades 8.8 (Metric) and ASTM A193/BS4882 Grade B7 (Imperial) or similar
2 = AF size based on heavy series nuts
3 = Bolt tension equates to a bolt stress of 70% of the minimum yield strength
4 = Torque figures detailed are based on 70% of the minimum yield strength f the minimum bolt yield stress
|
