.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 tighten
-
ing.
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
Nut Size
Torque
Recommended
Size
Across
Value•
Turns To Tighten
OD
Flats
(After Finger
Tightening)
(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
/
8
/
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
