MIL-DTL-26633E
3.3.2.4 Coupling guard. When specified (see 6.2), a coupling guard shall be securely attached to
each end of the hose assembly. The coupling guard shall protect the end portions of the hose assembly
as necessary to minimize hose failure due to bending at or near the coupling.
3.3.3 Lubricants. With the exception of clean water, lubricants shall not be used in the assembly of
hose components unless such lubricants have been specifically approved by the qualifying activity (see
Hose
Hose
Nominal
Hose ID
Hose OD
Coupling ID
minimum
End fitting to
dash
OD of rigid
minimum
maximum
minimum
inside bend
mate with
size
tube (ref)
"A"
"B"
"C"
radius
.250
.212
.703
.109
3.250
MS33656-5
-4
(6.35 mm)
(5.38 mm)
(17.86 mm)
(2.77 mm)
(82.55 mm)
NOTES:
1. Dimensions are in inches.
2. Metric equivalents are given for information only.
3. Tolerances: Length L:
L under 24 inches (61 cm)
± .125 (3.18 mm)
L from 24 to 36 inches (61 to 91 cm)
± .250 (6.35 mm)
L from 36 to 50 inches (91 to 127 cm)
± .500 (12.70 mm)
L over 50 inches (127 cm)
± 1 percent
FIGURE 1. Hose assembly details and length.
3.4 Performance.
3.4.1 Performance tests on PTFE inner tube.
3.4.1.1 Density and relative density. When tested in accordance with 4.8.2.1, the PTFE inner tube
specific gravity shall not exceed 2.155 apparent and 2.210 relative.
3.4.1.2 Tensile and elongation. When tested In accordance with 4.8.2.2, the tensile strength shall be
a minimum of 2200 psi (16.17 MPa) and the elongation shall be a minimum of 200%.
5
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