MIL-DTL-27272C
4.6.2 Lubricant wear. Fittings shall be assembled to the hose six times and disassembled five times
using the following procedure. New ends of hose shall be used for each assembly cycle (see 3.6.2).
a. The hose shall be cut to the nominal length specified in table II using a cutoff wheel. Each end
shall be cut square taking care to minimize braid flare-out.
b. The sockets at each hose end shall be inserted back-to-back over the wire braid of the hose
using a threading motion. The threaded end of the sockets shall be positioned at the extreme
end of the hose.
c. The nipple hex nut shall be held firmly and the hose pushed onto the nipple. The hose shall be
oscillated around the nipple to separate the wire braid from the tube. The hose shall be started
onto the nipple carefully to prevent damage to the end of the tube. The hose shall then be
removed from the nipple.
d. The sleeve shall be inserted between the hose braid and tube and positioned by pushing it firmly
against a flat surface until the cutoff end of the tube bottoms against the inside shoulder of the
sleeve.
e. The hose shall be inserted onto the nipple with a steady force and a slight rotation of the hose
until the sleeve bottoms against the nipple chamber. The hose shall be removed while rotating
slightly, and a check made to ensure that the tube is still bottomed against the sleeve shoulder.
The hose and sleeve shall be pushed again onto the nipple until the sleeve bottoms against the
nipple chamber. The socket shall be threaded onto the nipple using hand force. The threaded
portion of class 2 nipples shall be lubricated with an SAE-30 weight lubricant. No additional
lubricant is required for class 1 fittings.
f. Using the proper size torque wrench, the socket and nipple shall be tightened until the gap
specified on figure 1 is obtained. Final torque shall not exceed the applicable value specified in
table I for the size of the fitting being used. The final torque value shall be recorded.
FIGURE 1. Gap measurement.
g. With the proper size wrench, the nipple shall be loosened and removed from the socket and
hose.
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