MIL-DTL-13719G
3.5.6 Low temperature flexibility. Hose assemblies, when tested in 4.5.8, shall show no evidence of
breaks, cracks, or leakage at low temperatures.
3.5.7 Tensile strength. Hose assemblies, when tested in 4.5.9, shall show no evidence of rupture of
hose or fittings, or loosening of the fittings when subjected to a straight pull at a separation rate of 1 ±0.1
inch per minute (25.4 ±2.5 mm/min.) until a pull load of 325 lb (1446 Newtons) is attained.
3.5.8 Ozone resistance. Hose when visually examined at 9X magnification shall show no evidence
of cracks or breaks when tested for ozone resistance in 4.5.10.
3.5.8.1 Hazardous substances and ozone depleting chemicals. The ozone resistance test (see
4.5.10) may contain hazardous chemicals. It shall be handled in accordance with Federal regulations and
guidelines to perform those tests. For further information about toxic chemicals and hazardous materials
list, consult the Environmental Protection Agency web database at
3.5.9 Fluid resistance. The volume of a hose tube specimen, when tested in 4.5.11, shall not
increase by more than 20 percent nor decrease by more than 3 percent.
3.5.10 Salt spray resistance (steel fittings only). When hose assemblies are exposed to salt spray
testing in 4.5.12 the plating on the fittings shall show no corrosion products of zinc or basis metal
corrosion products. The appearance of corrosion products visible to the unaided eye at normal reading
distance shall be cause for rejection, except for white corrosion products at the edges of the specimens
shall not constitute a failure. Hose assemblies shall subsequently meet the proof pressure requirements
of 4.5.4.
3.6 Identification and marking.
3.6.1 Hose. The outer cover of hose shall have the outer cover marked with an oil-resistant,
continuous blue stripe at least 1/16 (.0625 inch (1.59 mm)) of an inch wide. The following information
shall be permanently and legibly marked or broken into the stripe at repeated intervals of not more than 6
inches (15.2 cm) on the lay line of the hose, see 4.5.2.
a. PIN as specified in 1.2, length designator may be omitted.
b. Cure date in quarter and year such as 4Q07 for fourth quarter 2007.
c. Capital letters either ``HR'' to indicate that the hose is regular expansion hydraulic hose or ``HL''
to indicate that the hose is low expansion hydraulic hose.
d. Hose assembly manufacturer's commercial and government entity (CAGE).
e. Manufacturer's name or trademark.
3.6.2 Hose with unmarkable surface. Hose may be marked as specified in 3.6.3, when the cover is
too rough, or it is determined that the use of a stripe on the outside cover is impractical.
3.6.3 Hose assembly marking. The hose assembly shall be identified by a permanently snug-fitting
aluminum or stainless steel band around the hose near the end fitting. The band shall be designed to
remain tight on the hose to prevent relative movement and resultant chafing. The band shall be etched,
embossed, or stamped in block capital letters, numerals or symbols at least one-eighth of an inch high.
Where the hose assembly exceeds 4 feet (1.22 m) in length, a band shall be attached near each end
fitting of the assembly. The metal band shall be marked in raised, etched, or stamped lettering with the
following information appropriately identified:
a. PIN as specified in 1.2, length designator may be omitted.
b. Cure date in quarter and year such as 4Q07 for fourth quarter 2007.
c. Capital letters either ``HR'' to indicate that the hose is regular expansion hydraulic hose or ``HL''
to indicate that the hose is low expansion hydraulic hose.
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