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Torque Specs. for Structural Bolts
This page is for use primarily when dealing with high-strength vehicle fasteners such as ROPS hardware that hold the
structure together for safety. This page can also be used for other solid metal-to-metal joints. Do not use these high torque
values on any of the following applications involving: tubing, plastic, nylon or rubber washers, threaded inserts, etc.. See
previous page regarding less critical fasteners.
The values below apply to fasteners that are dry or lubricated with normal engine oil. They do not apply if special graphited or
moly disulphide greases or other extreme pressure lubricants are used. This applies to both UNF and UNC threads.
Remember to always use the same grade or property class when replacing bolts.
IMPORTANT: on all PLATED GRADE 8 bolts, reduce torque 15% from listed bolt torque specification.
SAE Grade No.
Bolt head identification
mark as per grade.
NOTE: Manufacturing
Marks Will Vary
Bolt Size
Pounds Feet
Inches
Millimeters
Min.
1/4
6.35
5
5/16
7.94
10
3/8
9.53
20
7/16
11.11
30
1/2
12.70
45
9/16
14.29
65
5/8
15.88
95
3/4
19.05
150
7/8
22.23
160
1
25.40
250
1-1/8
25.58
-
1-1/4
31.75
-
1-3/8
34.93
-
1-1/2
38.10
-
METRIC BOLT TORQUE SPECIFICATIONS
Size of Screw
Property Class
5.6
M6
8.8
10.9
5.6
M8
8.8
10.9
5.6
M10
8.8
10.9
5.6
M12
8.8
10.9
5.6
M14
8.8
10.9
5.6
M16
8.8
10.9
5.6
M18
8.8
10.9
5.6
M20
8.8
10.9
2
TORQUE
Newton-Meters
Max.
Min.
Max.
Min.
6
7
8
9
12
14
16
17
23
27
31
35
35
41
47
54
52
61
70
80
75
88
102
110
105
129
142
150
185
203
251
270
200
217
271
400
300
339
406
580
-
-
-
800
-
-
-
1120
-
-
-
1460
-
-
-
1940
Course Thread
Pitch (mm)
Pounds Feet
3.6-5.8
1.0
5.8-9.4
7.2-10
7.2-14
1.25
17-22
20-26
20-25
1.5
34-40
38-46
28-34
1.75
51-59
57-66
49-56
2.0
81-93
96-109
67-77
2.0
116-130
129-145
88-100
2.0
150-168
175-194
108-130
2.5
186-205
213-249
5
TORQUE
Pounds Feet
Newton-Meters
Max.
Min.
Max.
11
12
15
20.5
23
28
42
48
57
64
73
87
96
109
130
132
149
179
180
203
244
324
366
439
480
542
651
696
787
944
880
1085
1193
1240
1519
1681
1680
1980
2278
2200
2631
2983
5.6
Newton-Meters
Pitch (mm)
4.9-7.9
7.9-12.7
9.8-13.6
9.8-19
23-29.8
27.1-35.2
27.1-33.9
46.1-54.2
51.5-62.3
37.9-46.1
69.1-79.9
77.2-89.4
66.4-75.9
109.8-126
130.1-147.7
90.8-104.3
157.2-176.2
174.8-196.5
119.2-136
203.3-227.6
237.1-262.9
146.3-176.2
252-277.8
288.6-337.4
8*
TORQUE
Pounds Feet
Newton-Meters
Min.
Max.
Min.
12
15
16
24
29
33
45
54
61
70
84
95
110
132
149
160
192
217
220
264
298
380
456
515
600
720
814
900
1080
1220
1280
1440
1736
1820
2000
2468
2380
2720
3227
3160
3560
4285
*Thick Nuts must be used with Grade 8 bolts
8.8
10.9
Fine Thread
Pounds Feet
Newton-Meters
-
-
-
-
12-17
1.0
19-27
22-31
20-29
1.25
35-47
40-52
31-41
1.25
55-68
62-75
52-64
1.5
90-106
107-124
69-83
1.5
120-138
140-158
100-117
1.5
177-199
202-231
132-150
1.5
206-242
246-289
28 of 28
Max.
20
39
73
114
179
260
358
618
976
1464
1953
2712
3688
4827
-
-
-
16.3-23
25.7-36.6
29.8-42
27.1-39.3
47.4-63.7
54.2-70.5
42-55.6
75.9-92.1
84-101.6
70.5-86.7
122-143.6
145-168
93.6-112.5
162.6-187
189.7-214.1
136-158.5
239.8-269.6
273.7-313
178.9-203.3
279.1-327.9
333.3-391.6
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