Form 169018 6 Revision C
D. FLARE TYPE HYDRAULIC FITTINGS
a. Check flare and flare seat for defects that might
cause leakage.
b. Align tube with fitting before tightening.
c. Lubricate connection and hand tighten swivel nut
until snug.
d. 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.
SAE
NO.
TUBE
SIZE
O.D.
(in.)
THD
SIZE
(in.)
NUT
SIZE
ACROSS
FLATS
(in.)
TORQUE
VALUE*
RECOMMENDED
TURNS TO
TIGHTEN
(AFTER FINGER
TIGHTENING)
ft·lbf N·m Flats Turns
3 3/16
3/8
7/16 6 8 1 1/6
4 1/4
7/16
9/16 9 12 1 1/6
5 5/16
1/2
5/8 12 16 1 1/6
6 3/8
9/16
11/16 18 24 1 1/6
8 1/2
3/4
7/8 34 46 1 1/6
10 5/8
7/8
1 46 62 1 1/6
12 3/4
1-1/16
1-1/4 75 102 3/4 1/8
14 7/8
1-3/8
1-3/8 90 122 3/4 1/8
16 1
1-5/16
1-1/2 105 142 3/4 1/8
* The torque values shown are based on lubricated connections
as in reassembly.
E. O-RING TYPE HYDRAULIC FITTINGS
a. Inspect O-ring and seat for dirt or obvious defects.
b. On angle fittings, back off the lock nut until washer
(A) bottoms out at top of groove (B) in fitting.
c. Hand tighten fitting until back up washer (A) or
washer face (if straight fitting) bottoms on part
face (C) and O-ring is seated.
d. Position angle fittings by unscrewing no more than
one turn.
e. Tighten straight fittings to torque shown.
f. Tighten angle fittings to torque shown in the
following table while holding body of fitting with a
wrench.
SAE
NO.
THD
SIZE
(in.)
NUT SIZE
ACROSS
FLATS
(in.)
TORQUE
VALUE*
RECOMMENDED
TURNS TO TIGHTEN
(AFTER FINGER
TIGHTENING)
ft·lbf N·m Flats Turns
3 3/8 1/2 6 8 2 1/3
4 7/16 9/16 9 12 2 1/3
5 1/2 5/8 12 16 2 1/3
6 9/16 11/16 18 24 2 1/3
8 3/4 7/8 34 46 2 1/3
10 7/8 1 46 62 1-1/2 1/4
12 1-1/16 1-1/4 75 102 1 1/6
14 1-3/16 1-3/8 90 122 1 1/6
16 1-5/16 1-1/2 105 142 3/4 1/8
20 1-5/8 1-7/8 140 190 3/4 1/8
24 1-7/8 2-1/8 160 217 1/2 1/12
* The torque values shown are based on lubricated connections
as in reassembly.
FLARE
FLARESEAT
BODY
NUT
A
B
C
LOCKNUT
SEAT
WASHE
O-RING
GROOVE
FITTING
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