MIL-DTL-25579G
3.5.1 Inner tube. The inner tube shall be seamless extrusion of virgin polytetrafluoroethylene resin. The
hose inner tube shall conform to all of the requirements in MIL-DTL-27267 for the bulk hose to be assembled
with MIL-DTL-27272 hose connector fitting. For permanently attached fitting hose assemblies the hose should
meet the requirements of MIL-DTL-27267.
3.5.1.1 Reinforcement. The reinforcement shall consist of corrosion resistant steel wires in accordance with
the applicable specification listed in table I Hose under -16Z shall have a single layer of braid and hose -16Z
and above shall have two layers of braid. The letter "Z" following the dash size signifies that a double layer of
wire braid is mandatory. The wires shall be so arranged over the inner tube as to provide sufficient strength to
insure conformance with the requirements herein. Broken or missing reinforcing wires shall be cause for
rejection. Crossed-over wires shall not be cause for rejection.
3.5.2 Fittings. The end fittings for the hose assembly may be either field-attachable type in accordance with
MIL-DTL-27272 or the permanent type. Materials shall be selected for the specific operating conditions as
specified in 3.3. For class 2 hose assemblies (size -8 and larger), the socket, and the sleeve if used, shall be
stainless steel and the nipple, nut, and elbow (if applicable) shall be aluminum alloy, see table I for fitting
materials. Flared fittings shall mate with SAE-AS4395 and flareless fittings shall mate with SAE-AS33514 in
accordance with applicable MS in accordance with MIL-DTL-25579/1. Flange fittings shall mate with the
mounting pad as shown on MS33786. An alternate nut, functionally equivalent, may be used for NAS 1760 or
MS8000 series seal application.
3.5.2.1 Fittings embrittlement resistance. All crimped or swaged end fitting sockets (collars) that are
fabricated from 304 stainless steel shall be capable of passing the embrittlement test specified in ASTM A262,
practice E, prior to assembly to the nipple or the swaging operation. Sockets fabricated from stabilized
austenitic steel are acceptable without being subjected to the embrittlement test.
3.5.3 Screw threads. All coupling nut threads shall be in accordance with SAE-AS8879, category I.
However, no more than a 10% increase in the thread tolerances specified in SAE-AS8879 shall be accepted for
the coupling nut thread after the first connection (see 4.5.2).
3.5.4 Dimensions and weights. Except for length (see 3.5.5), the dimensions of the hose assembly and the
3.5.5 Length. Hose assembly shall be furnished in lengths as specified in the contract or purchase order
(see 6.2), however, tolerances on the length of each hose assembly shall be as follows:
±.125 inch for lengths under 18 inches.
a.
±.250 inch for lengths from 18 inches to 36 inches.
b.
±.500 inch for lengths from 36 inches to 50 inches.
c.
±1% for lengths over 50 inches.
d.
3.5.6 Assembly passage-way inspection. The assembly, with attached fittings, shall be examined for
any excessive restriction to the fitting passage by rolling a ball of the applicable diameter in table II,
through the assembly. The ball shall pass freely through the assembly. The ball checks the ovality of the
bend (tube) and the match-up of the tube and nipple or connection end and the weld/braze drop through
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