47
7.3 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. Lubricate connection and hand tighten swivel nut until snug.
4. To prevent twisting the tube(s), use two wrenches. Place one wrench on the connector body and with
the second tighten the swivel nut to the torque shown.
• The torque values shown are based on lubricated connections as in
reassembly.
Tube Size
OD
Nut Size
Across
Flats
(in.)
(in.)
(N.m)
(lb-ft)
(Flats)
(Turn)
3/16
7/16
8
6
1
1/6
1/4
9/16
12
9
1
1/6
5/16
5/8
16
12
1
1/6
3/8
11/16
24
18
1
1/6
1/2
7/8
46
34
1
1/6
5/8
1
62
46
1
1/6
3/4
1-1/4
102
75
3/4
1/8
7/8
1-3/8
122
90
3/4
1/8
HYDRAULIC FITTING TORQUE
Torque Value*
Recommended
Turns To Tighten
(After Finger
Tightening)