MIL-DTL-26521L
3.7.1 Identification data. The identification data shall be applied, using a wear resistant material or
embossed longitudinally and continuously along hose. The identification characters shall not be less than
.2 inches (5.1 mm) high. The marking shall withstand marking tests in accordance with SAE-ARP6002
using MIL-DTL-5624 and MIL-DTL-83133 as test fluids.
3.7.2 Hose assembly serial number. Each hose assembly shall be identified with a serial number
that is wear resistant and discernible to the naked eye. The serial number shall be placed 12 ± 2 ft (3658
± 610 mm) from each hose end or on the nut.
3.8 Couplings. See figure 3.
3.8.1 Couplings. A hose sample that meets this specification's requirements shall be fitted with an
EI 1529 male coupling at each end, see figure 3. Couplings on the ends of the hoses shall be internally
expandable, non-reusable design, two-piece construction (see 6.2.). The following details shall apply:
a. The male fitting body shall be high strength brass that meets or exceeds ASTM B121/B121M
or ASTM B124/B124M specification requirements.
b. The serrated ferrule shall be brass that meets or exceeds ASTM B121/B121M or
ASTM B124/B124M specification requirements or 300 series corrosion resistance steel.
c. The coupling shall be furnished with standard male NPT (American Standard Taper Thread)
threads. The threads shall be in accordance with FED-STD-H28/10.
d. When expanded, these fittings shall have an inside diameter conforming to the nominal inside
diameter of the hose.
e. Slippage of hose/coupling connection shall not exceed .03 inch (0.8 mm) due to hose
pressurization to proof pressure when tested in accordance with 4.6.3.4. This measurement
shall be made after hose assembly depressurization from proof pressure.
f. Couplings shall be capable of performing free of failure for the expected life of the hose. The
couplings used shall meet all of the requirements of this specification.
FIGURE 3. Coupling, internally expandable.
3.8.2 Couplings caps. The couplings shall be provided with protective one-time use, tapered or
threaded caps for external threaded couplings. The caps shall be of a fuel and oil resistant polymer. The
caps or plugs shall be securely attached and shall withstand normal strains, jarring, and vibrations
encountered during shipping, storage, and handling. Hose assemblies without a cap or plug shall be
rejected.
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