Introduction
1-22 79033095 C Rev.
TIGHTENING STRAIGHT THREAD
FITTINGS
Straight thread hydraulic fittings require precise
tightening. Overtightening of hydraulic fittings ruin sealing
surfaces and require replacement of damaged parts.
Proper initial tightening depends on mating parts to be
connected. Proceed as follows:
An adapter fitting (37 degree flare) connected to a double
flare tube assembly. Fitting must be tightened finger tight
and wrenched 1/2 turn (for single flare, 1/4 turn).
An adapter fitting (37 degree flare) connected to a hose.
Fitting must be tightened finger tight and wrenched 1/4
turn.
An o-ring adapter fitting connected to a solid port. Fitting
must be tightened so backup washer contacts face of
boss after fitting has been properly positioned.
To retighten after initial tightening, as in service work, both
tube and hose connections should be tightened finger
tight and wrenched 1/4 turn. O-ring fittings should be
tightened as for initial assembly.
JIC SWIVEL NUTS (37 degree SEAT). The following
values are maximum recommended torque values for JIC
(37 degree seat) swivel nuts either swaged or brazed
type. Swivel nuts normally withstand this torque for a
minimum of 15 repeated assemblies.
Torque required to seal swivel female fittings or hose
couplings to a male connector depend on many variables
such as fluid medium, pressure, surface finish, etc. The
following values are intended only as a guide for
maximum values fittings may be subjected to.
DASH SIZE TUBE O. D.
(REF.)
TORQUE MAX
Nm lbf in lbf ft
-4 1/4 12 110 9
-5 5/16 20 180 15
-6 3/8 27 240 20
-8 1/2 40 360 30
-10 5/8 54 480 40
-12 3/4 95 840 70
-14 7/8 110 980 80
-16 1 120 1080 90
-20 1 1/4 160 1440 120
-24 1 1/2 180 1575 130
-32 2 400 3600 300
-40 2 1/2 540 4800 400
-48 3 680 6000 500
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