Introduction
01-20 79026547 Rev. A
TIGHTENING STRAIGHT THREAD
FITTINGS
Straight thread hydraulic fittings require precise
tightening. Overtightening ruins 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° 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° 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 connnections should be tightened finger
tight and wrenched 1/4 turn. O-ring fittings should be
tightened as for initial assembly.
JIC SWIVEL NUTS (37° SEAT). Following values are
maximum recommended torque values for JIC (37° seat)
swivel nuts either swaged or brazed type. Swivel nuts
normally withstand torque for a minimum of 15 repeated
assemblies.
Torque required to seal swivel female fittings or hose
couplings to a male connector depends on many
variables such as medium, pressure, surface finish, etc.
Following values are intended only as a guide for
maximum values fittings may be subjected to.
DASH SIZE TUBE O. D.
(REF.)
TORQUE MAX
N-m lb-in lb-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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