29
51-4771
BOLT TORQUE SPECIFICATIONS
BOLT TORQUE SPECIFICATION
GENERAL TORQUE SPECIFICATION TABLES
Use the following charts when determining bolt torque specifications, when special torques are not given. Always use grade
5 or better when replacing bolts.
SAE BOLT TORQUE SPECIFICATIONS
Note: The following torque values are for use with extreme pressure lubricants, plating or hard washer
applications. Increase torque 15% when using hardware that is unplated and either dry or lubricated with engine oil.
SAE GRADE 5 TORQUE
SAE GRADE 8 TORQUE
Bolt Size
Ft-lbs
Newton-Meter
Ft-lbs
Newton-Meter
Bolt head identification marks as per grade.
NOTE: Manufacturing Marks Will Vary
Inches
mm
UNC
UNF
UNC
UNF
UNC
UNF
UNC
UNF
1/4
6,35
8
9
11
12
10
13
14
18
5/16
7,94
14
17
19
23
20
25
27
34
3/8
9,53
30
36
41
49
38
46
52
62
7/16
11,11
46
54
62
73
60
71
81
96
1/2
12,70
68
82
92
111
94
112
127
152
9/16
14,29
94
112
127
152
136
163
184
221
5/8
15,88
128
153
174
207
187
224
254
304
3/4
19,05
230
275
312
373
323
395
438
536
7/8
22,23
340
408
461
553
510
612
691
830
1
25,40
493
592
668
803
765
918
1037
1245
1-1/8
25,58
680
748
922
1014
1088
1224
1475
1660
1-1/4
31,75
952
1054
1291
1429
1547
1700
2097
2305
1-3/8
34,93
1241
1428
1683
1936
2023
2312
2743
3135
1-1/2
38,10
1649
1870
2236
2535
2686
3026
3642
4103
METRIC BOLT TORQUE SPECIFICATIONS
NOTE: The following torque values are for use with metric hardware that
is unplated and either dry or lubricated with engine oil. Reduce torque
15% when using hardware that has extreme pressure lubricants, plating
or hard washer applications.
Bolt head identification marks as per grade.
Bolt Size
Grade No.
Pitch (mm)
Ft-lbs
Newton-Meter
Pitch (mm)
Ft-lbs
Newton-Meter
5.6
3.6-5.8
4,9-7,9
-
-
M6
8.8
1,0
5.8-.4
7,9-12,7
-
-
-
10.9
7.2-10
9,8-13,6
-
-
5.6
7.2-14
9,8-19
12-17
16,3-23
M8
8.8
1,25
17-22
23-29,8
1,0
19-27
25,7-36,6
10.9
20-26
27,1-35,2
22-31
29,8-42
5.6
20-25
27,1-33,9
20-29
27,1-39,3
M10
8.8
1,5
34-40
46,1-54,2
1,25
35-47
47,4-63,7
10.9
38-46
51,5-62,3
40-52
54,2-70,5
5.6
28-34
37,9-46,1
31-41
42-55,6
M12
8.8
1,75
51-59
69,1-79,9
1,25
56-68
75,9-92,1
10.9
57-66
77,2-89,4
62-75
84-101,6
5.6
49-56
66,4-75,9
52-64
70,5-86,7
M14
8.8
2,0
81-93
109,8-126
1,5
90-106
122-143,6
10.9
96-109
130,1-147,7
107-124
145-168
5.6
67-77
90,8-104,3
69-83
93,5-112,5
M16
8.8
2,0
116-130
157,2-176,2
1,5
120-138
162,6-187
10.9
129-145
174,8-196,5
140-158
189,7-214,1
5.6
88-100
119,2-136
100-117
136-158,5
M18
8.8
2,0
150-168
203,3-227,6
1,5
177-199
239,8-269,6
10.9
175-194
237,1-262,9
202-231
273,7-313
5.6
108-130
146,3-176,2
132-150
178,9-203,3
M20
8.8
2,5
186-205
252-277,8
1,5
206-242
279,1-327,9
10.9
213-249
288,6-337,4
246-289
333,3-391,6
Grade 2
Grade 5
Grade 8
