TM 1-4920-924-13&P
FIELD MAINTENANCE
AVIATION SHOP EQUIPMENT CONTACT MAINTENANCE (AV SECM) SYSTEM
TORQUE LIMITS
Fastener Tightening Data
The following tables contain detailed information about variables for torque management to achieve correct
fastener joint tightening. This is an advisory guide and responsibility for its application rests with the user.
NOTE
Do not use these values if a different torque value is given for a speciic procedure.
If the fastened part is aluminum, reduce torque 25%.
Fasteners should be replaced with the same or higher grade. If higher grade fasteners are used, they should
be tightened to the strength of the original fastener.
TORQUE LIMITS
Table 1. US Bolt Identiication
U.S. Bolt Grades
SAE 2
SAE 5
SAE 7
SAE 8
I.D. Marks
No markings
3 lines
5 lines
6 lines
Medium-
Medium-
Material
Medium-
Low Carbon
Carbon,
Carbon,
Carbon,
Quenched &
Quenched &
Tempered
Tempered
Tempered
Tensile strength
74,000 psi
120,000 psi
150,000 psi
160,000 psi
(Minimum)
Table 2. Standard SAE Torque Chart (Course Threads)
Standard Steel Bolts
Torque Speciications
Standard Dry Torque in Foot-Pounds
SAE
SAE
SAE
SAE
SAE
SAE
Grade 0-1-2
Grade 3
Grade 5
Grade 6
Grade 7
Grade 8
Fastner Coarse
74,000 psi
100,000 psi 120,000 psi 133,000 psi 133,000 psi 150,000 psi
Size
Threads
Med.
Med.
Med.
Med.
Med.
(in)
(ths/in.) Low Carbon
Carbon
Carbon
Carbon
Carbon
Carbon
Steel
Alloy Steel
Alloy Steel
Temp.
Heat T.
Steel
Steel
Steel
20
6
9
10
12.5
13
14
1/4
18
12
17
19
24
25
29
5/16
16
20
30
33
43
44
47
3/8
14
32
47
54
69
71
78
7/16
13
47
69
78
106
110
119
1/2
12
69
103
114
150
154
169
9/16
11
96
145
154
209
215
230
5/8
10
155
234
257
350
360
380
3/4
9
206
372
382
550
570
600
7/8
1
8
310
551
587
825
840
700
00221