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9.3 Hydraulic Fitting Torque
Tightening Flare Type Tube
Fittings
1. Check flare and flare seat for defects that might
cause leakage.
2. Align tube with fitting before tightening.
3. Hand-tighten swivel nut until snug.
4. To prevent twisting the tube, use two wrenches.
Place one wrench on the connector body and tighten
the swivel nut with the second. Torque to values
shown.
If a torque wrench is not available, use the FFFT
(Flats From Finger Tight) method.
9.4 Wheel Lug Torque
It is extremely important safety procedure to
apply and maintain proper wheel mounting
torque on your trailer axle. Torque wrenches are
the best method to assure the proper amount of
torque is being applied to a fastener.
Wheel lugs should be torqued before first
road use and after each wheel removal.
Check and re torque after the first 10 miles
(16 km), 25 miles (40 km), and again at
50 miles (80 km). Check periodically
thereafter.
NOTE: Wheel lugs must be applied and
maintained at the proper torque levels to
prevent loose wheels, broken studs, and
possible dangerous separation of wheels
from your axle.
• Start all lugs by hand to prevent cross threading.
• Tighten lugs in sequence, per wheel lug torque
sequence chart.
• The tightening of the fasteners should be done in
stages. Following the recommended sequence,
tighten fasteners per wheel torque requirements
chart.
BXTR6438
Hydraulic Fitting Torque
Hex
Tube
Size
Size
Torque value
Across
OD
Flats
lbf•ft
Inches
Inches
3/16
7/16
6
1/4
9/16
11–12
5/16
5/8
14–16
3/8
11/16
20–22
1/2
7/8
44–48
5/8
1
50–58
3/4
1-1/4
79–88
1
1-5/8
117–125
Values shown are for non-lubricated connections.
Wheel Lug Nut Torque
Wheel
Units
1st Stage 2nd Stage 3rd Stage
Size
lbf•ft
8"
N•m
lbf•ft
12"
N•m
lbf•ft
13"
N•m
lbf•ft
14"
N•m
lbf•ft
15"
N•m
lbf•ft
16"
N•m
Wheel Lug Torque Pattern
4-Bolt
5-Bolt
63
Flats From
Finger Tight
N•m
Flats
8
2
15–17
2
19–22
2
27–30
1-1/4
59–65
1
68–79
1
107–119
1
158–170
1
12–20
30–35
16–26
39–45.5
20–25
35–40
26–32.5
45.5–52
20–25
35–40
26–32.5
45.5–52
20–25
50–60
26–32.5
65–78
20–25
50–60
26–32.5
65–78
20–25
50–60
26–32.5
65–78
6-Bolt
Turns
1/6
1/6
1/6
1/6
1/6
1/6
1/8
1/8
45–55
58.5–71.5
50–60
65–78
50–60
65–78
90–120
117–156
90–120
117–156
90–120
117–156
8-Bolt
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