Apply downward pressure on the
When the desired angle of bend is
reached, as shown on the block, release pressure on the
Raise the slide bar, release the
locking clip, and remove the tube from the bender.
Exercise care when bending stainless
steel tubing to avoid damage to the tube
Care. Observe the following practices for the
care and upkeep of tube benders:
(1) Clean all grease and oil from
Apply a light coat of oil to all non-
Flaring Tools. Flaring tools are used to flare
the ends of tubing to provide a sealing surface. The
flare made by these tools measures 37 degrees on each
Flared tubing and fittings used on aircraft
have a 37-degree flare angle. Do not use
automotive flare tools, which have a flare
angle of 45 degrees. If automotive flare
tools are used, the tubing will not seal and
system failure will occur.
Types. The two general types of flaring tools
are the single and double. They produce flares as
shown in figure 4-119.
Figure 4-119. Single and Double Flares
Single-flare tools. There are two types of
flaring tools that produce single flares. They are the
combination and the individual flaring tools.
Combination flaring tool.
combination flaring tools have a die block with
accommodations for tubing from 1/8 to 3/4 inches in
diameter. As shown in figure 4-120, the flare cone can
be activated by a T-handle, turning a screw, or by a
plunger that is tapped by a hammer.
individual flaring tool is made for a specific tube
diameter, shown in figure 4-121. This tool uses the
sleeve and nut that will remain on the tube when it is
installed. The nut secures the tube to the tool. The
flare is made by tapping the plunger with a hammer.
Double-flaring tool. The double-flaring
tool, shown in figure 4-122, has two punches which are
tapped by a hammer to produce the flare. Refer to TM
1-1500-204-23-2 for the applications of a double flare.
Figure 4-120. Combination Flaring Tools