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TM 10-4320-351-14
BOLT NOMENCLATURE
ENGLISH SYSTEM
METRIC SYSTEM
Example: 1/4 - 28 x 1.25
Example: M8 - 1.0 x 25
D
T
L
D
T
L
D = Diameter (inches)
L = Length (inches)
D = Diameter (millimeters)
L = Length (millimeters)
G = Grade (bolt strength)
T = Threads/inch
P = Property (bolt strength)
T = Thread width (millimeters)
STANDARD TORQUE VALUES - ENGLISH SYSTEM
In the absence of specific torque values, the following chart can be used as a guide to the maximum safe torque for a
particular size/grade of fastener. There is no torque difference for fine or coarse threads. Torque values are based on
clean, dry threads. Reduce value by 10% if threads are oiled before assembly.
SAE Grade Number
1
2
5
8
Number of slashes
always 2 less than
grade number
Wrench
Maximum Torque
Maximum Torque
Maximum Torque
Maximum Torque
Dia.
Size
lb in
Nm
lb in
Nm
lb in
Nm
lb in
Nm
#6
6
0.7
15
1.7
#8
11
1.2
28
3.2
#10
16
1.8
41
4.6
#12
25
2.8
65
7.3
lb ft
Nm
lb ft
Nm
lb ft
Nm
lb ft
Nm
1/4
7/16
3
4
5
7
8
11
12
16
5116
112
6.5
9
10
14
17
23
24
32
3/8
9/16
12
16
18
24
30
41
40
54
7116
5/8
19
26
30
41
50
68
70
95
1/2
3/4
30
41
45
61
75
102
105
142
9/16
13/16
40
54
65
88
105
142
150
203
5/8
15/16
55
75
90
122
145
197
205
278
3/4
1-1/8
100
136
160
217
260
353
365
495
7/8
1-5/16
165
224
165
224
415
563
590
800
1
1112
245
332
245
332
625
848
880
1193
1-1/8
1-11/16
345
468
345
468
780
1058
1250
1695
1-114
1-7/8
490
664
490
664
1100
1492
1765
2393
1-3/8
2-1116
640
868
640
868
1440
1953
2315
3140
1-1/2
2-1/14
850
1153
850
1153
1910
2590
3070
4163
H-3
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