INTRODUCTION
Torque
BOLT TORQUE INFORMATION
1. Fasteners should be replaced with the same or higher grade fasteners. If higher grade fasteners are used, these
should only be tightened to the strength of the original.
2. Make sure the fastener's threads are clean and that thread engagement is started. This will prevent them from
failing when being tightened.
3. Tighten plastic insert or crimped steel-type lock nuts to approximately
50 %
of the dry torque, applied to the nut,
not to the bolt head. Tighten toothed or serrated-type lock nuts to the full torque value.
4. The L9 (Alloy) fasteners torque values are for a bolt, nut, and two washers. When using L9 (Alloy) fasteners, do
not use the values in this table for tapped holes.
GRADE
1 or 2
5
5.1
5.2
8
8.2
L9 (Alloy)
SAE Markings
for Bolts and
Cap Screws
2
5
8
L9 (Alloy)
SAE Markings
for Hex Nuts
GRADE 2*
GRADE 5, 5.1 or 5.2
GRADE 8 or 8.2
GRADE L9 (Alloy)
SIZE
Dry **
Lubricated **
Dry**
Lubricated **
Dry**
Lubricated **
Head
Nut
7.5 Nm
5.7 Nm
10.8 Nm
8.5 Nm
16.3 Nm
12.2 Nm
13.6 Nm
14.9 Nm
1/4 UNF
5.5 lb ft
4.2 lb ft
8 lb ft
6.3 lb ft
12 lb ft
9 lb ft
10 lb ft
11 lb ft
8.5 Nm
6.4 Nm
13.6 Nm
9.8 Nm
19 Nm
13.6 Nm
16.3 Nm
17.6 Nm
1/4 UNC
6.3 lb ft
4.7 lb ft
10 lb ft
7.2 lb ft
14 lb ft
10 lb ft
12 lb ft
13 lb ft
15 Nm
11 Nm
23 Nm
18 Nm
33 Nm
24 Nm
26 Nm
28
28 Nm
5/16 UNF
11 lb ft
8 lb ft
17 lb ft
13 lb ft
24 lb ft
18 lb ft
19 lb ft
21 lb ft
16 Nm
12 Nm
26 Nm
19 Nm
37 Nm
27 Nm
27 Nm
31 Nm
5/16 UNC
12 lb ft
9 lb ft
19 lb ft
14 lb ft
27 lb ft
20 lb ft
20 lb ft
23 lb ft
27 Nm
20 Nm
41 Nm
31 Nm
61 Nm
47 Nm
41 Nm
45 Nm
3/8 UNF
20 lb ft
15 lb ft
30 lb ft
23 lb ft
45 lb ft
35 lb ft
30 lb ft
33 lb ft
31 Nm
23 Nm
47 Nm
34 Nm
68 Nm
47 Nm
47 Nm
52 Nm
3/8 UNC
23 lb ft
17 lb ft
35 lb ft
25 lb ft
50 lb ft
35 lb ft
35 lb ft
38 lb ft
43 Nm
33 Nm
68 Nm
47 Nm
95 Nm
68 Nm
75 Nm
81 Nm
7/16 UNF
32 lb ft
24 lb ft
50 lb ft
35 lb ft
70 lb ft
50 lb ft
55 lb ft
60 lb ft
49 Nm
37 Nm
75 Nm
54 Nm
108 Nm
81 Nm
81 Nm
88 Nm
7/16 UNC
36 lb ft
27 lb ft
55 lb ft
40 lb ft
80 lb ft
60 lb ft
60 lb ft
65 lb ft
68 Nm
47 Nm
102 Nm
75 Nm
149 Nm
108 Nm
115 Nm
129 Nm
1/2 UNF
50 lb ft
35 lb ft
75 lb ft
55 lb ft
110 lb ft
80 lb ft
85 lb ft
95 lb ft
75 Nm
54 Nm
115 Nm
88 Nm
163 Nm
122 Nm
129 Nm
142 Nm
1/2 UNC
55 lb ft
40 lb ft
85 lb ft
65 lb ft
120 lb ft
90 lb ft
95 lb ft
105 lb ft
95 Nm
75 Nm
149 Nm
108 Nm
203 Nm
149 Nm
163 Nm
190 Nm
9/16 UNF
70 lb ft
55 lb ft
110 lb ft
80 lb ft
150 lb ft
110 lb ft
120 lb ft
140 lb ft
108 Nm
81 Nm
163 Nm
122 Nm
231 Nm
176 Nm
183 Nm
203 Nm
9/16 UNC
80 lb ft
60 lb ft
120 lb ft
90 lb ft
170 lb ft
130 lb ft
135 lb ft
150 lb ft
136 Nm
102 Nm
203 Nm
149 Nm
285 Nm
217 Nm
231 Nm
251 Nm
5/8 UNF
100 lb ft
75 lb ft
150 lb ft
110 lb ft
210 lb ft
160 lb ft
170 lb ft
185 lb ft
149 Nm
115 Nm
231 Nm
176 Nm
325 Nm
244 Nm
258 Nm
278 Nm
5/8 UNC
110 lb ft
85 lb ft
170 lb ft
130 lb ft
240 lb ft
180 lb ft
190 lb ft
205 lb ft
47648338 18/06/2014
35
Summary of Contents for P2080
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