46
10.3 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 tubes, use two
wrenches. Place one wrench on the con-
nector 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) (lbf·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
