Induced Bolt Preload or Tension Corresponding to 65% of Yield Load (lbf)
Recommended Assembly Torque to Give induced Preload Equal to 65% of Yield Load (lbft)
1/4
BSW
750
3
5/16
BSW
1230
6
3/8
BSW
1820
12
7/16
BSW
2480
19
1/2
BSW
3250
28
5/8
BSW
5300
55
3/4
BSW
7830
98
7/8
BSW
10200
150
1
BSW
13300
230
1.1/8
BSW
16700
320
1.1/4
BSW
21500
450
1.1/2
BSW
30800
780
Class 4.6 Property Class 4.6 Commercial Low Tensile Bolts
Diameter (mm)
Bolt Tension Corresponding to 65% of Proof Load (kN)
Bolt Tension Corresponding to 65% of Proof Load (lbf)
Recommended Assembly Torque (Nm)
Recommended Assembly Torque (lbft)
5
2.08
468
2.1
1.5
6
2.94
660
3.5
2.5
8
5.34
1200
8.5
6.3
10
8.45
1900
17
12
12
12.4
2790
30
22
14
16.8
3780
47
35
16
22.9
5150
73
54
18
28.1
6320
101
75
20
35.8
8050
143
106
22
44.3
9960
195
145
24
51.6
11600
248
183
27
67
15060
362
265
30
81.9
18410
491
362
33
101
22800
669
495
36
120
26980
864
637
39
143
32150
1115
820
42
164
36870
1378
1020
48
215
48330
2064
1520
56
298
66990
3338
2460
64
393
88350
5030
3710
Recommended Assembly Torques – Grade 5 Grade 5 Unified High Tensile Bolts (Same as SAE J429 Grade 5)
AS/NZS 2465
Diameter & Thread
Diameter & Thread
Induced Bolt Preload or Tension Corresponding to 65% of Yield Load (lbf)
Recommended Assembly Torque to Give induced Preload Equal to 65% of Yield Load (lbft)
1/4
UNF
2020
8
5/16
UNF
3190
17
3/8
UNF
4840
30
7/16
UNF
6570
48
1/2
UNF
8840
74
5/8
UNF
14170
150
3/4
UNF
20610
260
7/8
UNF
28150
410
1
UNF
36660
610
1/4
UNC
1760
7
5/16
UNC
2890
15
3/8
UNC
4290
27
7/16
UNC
5880
43
1/2
UNC
7870
66
5/8
UNC
12480
130
3/4
UNC
18400
230
7/8
UNC
25550
370
1
UNC
33480
560
Recommended Assembly Torques – Grade 8 Grade 8 Unified High Tensile Bolts (Same as SAE J429 Grade 8)
AS/NZS 2465
Diameter & Thread
Diameter & Thread
Induced Bolt Preload or Tension Corresponding to 65% of Yield Load (lbf)
Recommended Assembly Torque to Give induced Preload Equal to 65% of Yield Load (lbft)
1/4
UNF
2830
12
5/16
UNF
4520
23
3/8
UNF
6830
43
7/16
UNF
9230
67
1/2
UNF
12500
104
5/8
UNF
19960
207
3/4
UNF
29120
363
7/8
UNF
39720
577
1
UNF
51740
859
1/4
UNC
2470
10
5/16
UNC
4100
21
3/8
UNC
6050
38
7/16
UNC
8320
60
1/2
UNC
11050
92
5/8
UNC
17620
183
3/4
UNC
26070
325
7/8
UNC
36010
523
1
UNC
47200
785
Class 8.8 Property class 8.8 High Tensile Bolts, ISO Coarse Series Threads
Diameter (mm)
Bolt Tension Corresponding to 65% of Proof Load (kN)
Bolt Tension Corresponding to 65% of Proof Load (lbf)
Recommended Assembly Torque (Nm)
Recommended Assembly Torque (lbft)
5
5.4
1210
5
4
6
7.6
1710
9
7
8
13.8
3100
22
16
10
21.9
4920
44
32
12
31.8
7150
77
57
14
43.4
9680
121
90
16
59.2
13310
190
140
18
74.8
16690
269
198
20
95.6
21490
370
270
22
118
26390
520
380
24
138
31020
640
470
27
177
39480
955
700
30
219
49230
1310
970
33
270
60330
1785
1320
36
319
71710
2300
1690
(39)
380
84980
2970
2190
(42)
437
98240
3670
2710
(48)
573
128820
5500
4060
(56)
792
178050
8870
6540
(64)
1045
234930
13380
9870
Recommended Assembly Torques – Class 10.9 Property class 10.9 High Tensile Bolts
AS 1110.1
Diameter (mm)
Bolt Tension Corresponding to 65% of Proof Load (kN)
Bolt Tension Corresponding to 65% of Proof Load (lbf)
Recommended Assembly Torque (Nm)
Recommended Assembly Torque (lbft)
5
7.67
1720
8
6
6
10.86
2440
13
10
8
19.76
4440
32
24
10
31.27
7030
63
46
12
45.5
10230
109
81
14
62
13960
175
130
16
84.5
19000
270
200
18
103
23160
370
275
20
131.95
29663
528
390
22
164
36868
720
530
24
190.45
42815
915
675
27
248
55752
1340
990
30
302.9
68094
1820
1340
33
371
83405
2450
1810
36
440.7
99073
3170
2340
39
527
118470
4110
3030
Reference only. Coatings, lubrication and joint condition change torque requirements — confirm against the relevant standard or your engineer's specification.
