The single flare.
Single flares are used for all sizes of
stainless steel tubing, for 6061 aluminum alloy tubing, and for
5052 aluminum alloy tubing larger than 1/2-inch OD.
The double flare. Double flares are specified for 5052 tubing
1/2-inch OD and smaller.
The Beaded Connection. This connection is used only to tubing or
to fittings. This type of connection is not capable of withstanding
high pressures and is used only in low-pressure systems. No picture
of beading is included here, but Figure 2-12, which illustrates a
low-pressure tube splice, shows an example of a beaded connection.
PREPARING TUBING FOR FLARING
Two steps are used to prepare tubing for flaring: reaming and
cleaning. They must be followed carefully so the tube is not damaged
or weakened, and to prevent foreign object damage when the tube is
After a square cut has been made bylations, marks,
seams, and excessive graphite. Check the fittings for mutilations to
the threaded areas, nicks,
Cleaning. Three prescribed methods of cleaning tubing are given
in TM 1-1500-204-23 series manuals.
Refer to the TM for materials
and how they are to be used because cleaning chemicals are constantly
These improvements are incorporated in the TM through
printed changes. An example is the use of solvent PS-661 which has
been changed to the use of naptha TT-N-95.
The list can go on and
Therefore, when using a cleaning agent on or in hydraulic
system, always refer to the latest applicable publications for the
correct material and usage.
The tube must be free of all dirt and
grease before clamping it in the flaring tool. The flaring tool die
block must be properly cleaned to prevent slips and deformation of
Two basic types of hand flaring tools provide a single flare: the
screw and the combination.
These tools are described in the