Snorkel AB60J Repair Parts Manual page 1068

Fastener Torque Chart – Standard System
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
AB60J – 0181971
SAE Grade SAE Grade
1 or 2
Minimum
Indeterminate
Commercial
Quality
Quality
Medium
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 6
Medium
Commercial
Quality
Medium Carbon
Carbon Steel
Steel Quenched and
Tempered
133,000 psi.
7 10
14 19
25 34
40 55
85
60
88 120
120 167
200 280
302 440
466 660
SAE Grade
8
Medium Carbon
Alloy Steel
Quenched and
Tempered
150,000 psi
10.5
22
37
60
92
132
180
296
473
714
Maintenance – 15