TM 1-1500-204-23-2
Table 4-9. AN Flared Fitting Identification
Material
Color
Code
Aluminum Alloy
Blue
D
Steel
Black
None
Brass
Natural
B
AN 819 (Sleeves) Aluminum Bronze
Cadmium Plated
Z
NOTE
Size: The dash number following the AN number indicates the size of the tubing (or hose) for which the fitting is made, in
16ths of an inch. This size measures the O. D. of tubing and the I. D. of hose. Fittings having pipe threads are coded
by a dash number, indicating the pipe size in 8ths of an inch The material code letter, as noted above, follows the dash
number.
EXAMPLE:
a. Precautions. The following precautions should
be followed to ensure an effective repair:
(1) Take extreme care to remove all chips, burrs,
and foreign material from tubing during repair.
(2) Any open line or fitting that will be left unat-
tended will be capped or plugged to prevent possible
contamination of the entire hydraulic system.
b. Repair of Low-Pressure Tubing Assemblies.
Low-pressure tubing assemblies can be repaired by the
following procedures:
(1) Remove damaged portion of tube, deburr
remaining ends, and remove cuttings from tube interior
(see figure 4-30).
(2) If possible, bead remaining tube ends.
(3) Cut a repair section of same diameter as
damaged tubing 1/2 inch shorter than removed
damaged portion. Deburr repair section and bead.
Clean tube.
(4) Cut two synthetic hose connections of proper
length and install a hose clamp over each end of each
hose connection. Slip both hose connections well back
over original tube. See figure 4-31 for tubing clearances.
4-26
