Snorkel A38E Parts And Service Manual page 103

Fastener Torque Chart
Bolt
Grade
Marking
Definition
Material
Minimum Tensile
Strength
Bolt Size
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
Torque chart information:
Consult manufacturers' specific recommendations, when available.
y
The chart may be used with both coarse and fine thread fasteners lightly lubricated.
y
Increase torque by 20% when multiple tapered tooth (shake proof) lock washers are used.
y
The torque values are given in foot-pounds.
y
Inch/pound equivalent may be obtained by multiplying by 12.
y
Maintenance – 16
SAE Grade SAE Grade
1 or 2
Minimum
Indeterminate
Commercial
Quality
Low
Carbon
Steel
Tempered
64,000 psi. 105,000 psi
Recommended Torque Value (ft lbs)
5
9
15
24
37
53
74
120
190
282
SAE Grade
5
Medium
Commercial
Quality Quality
Medium Medium Carbon
Carbon Steel
Steel Quenched and
Tempered
133,000 psi.
7
14
25
40
60
88
120
200
302
466
SAE Grade
6 8
Medium Carbon
Alloy Steel
Quenched and
Tempered
150,000 psi
10 10.5
19 22
34 37
55 60
85 92
132
120
167 180
280 296
440 473
660 714
A38E