MIL-DTL-13531J
3.7 Marking.
3.7.1 Hose cover marking (bulk hose). As a minimum, the hose cover material shall be marked at
intervals of not more than 12 inches (304.80 mm). The marking shall either be embossed or marked in
white on the lay line of the hose (see 6.6.1). The marking shall be legible and permanently marked on the
hose in such a way as not to deform or otherwise damage the hose covering. Hose made to a previous
issue may be used for a period equal to the age limits in 3.8, from the date of this revision to deplete
existing stock. Marking for bulk hose shall contain the following:
PIN
Date of manufacture (quarter of year and year)
Capital letters "OZ"
Bulk hose manufacturer's CAGE code
Example: M13531-B2A 3Q05 OZ XXXXX indicates a type II, 1/8 inch diameter hose, manufactured
in the third quarter 2005.
3.7.2 Hose assembly marking. The hose assembly shall have a removable tag attached to each
hose assembly. The tag marking shall contain the following:
PIN
Date of manufacture (quarter of year and year)
Capital letters "OZ"
Assembly manufacturer's CAGE code
Example: Hose assembly: M13531-A3B0964FD000-A 3Q05 OZ XXXXX indicates, a type III
hose, 3/16 diameter, class B (thin cover), 96 ½ inches long, Female 37° flare swivel 90° elbow hose
fitting, Female 37° flare swivel straight hose fitting, 0° displacement angle, steel cadmium plated,
manufactured in the third quarter 2005.
3.8 Age. The age of bulk hose and hose in the assemblies covered by this specification and
furnished for use by the Government shall not exceed the limits in accordance with SAE-AS1933.
3.9 Workmanship. All hose and hose assemblies shall be manufactured and processed in such a
manner as to be uniform in quality and shall be free from foreign material and other defects that will
affect life, serviceability, strength, assembly or durability (see table IV). Workmanship shall be such as
to enable the hose and hose assemblies to meet the applicable performance requirements of this
specification.
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