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TM 9-2320-304-14&P
J-3
b. Hoses and Fittings.
NOTE
Most fluid piping system sizes are
measured by dash numbers. These are
universally used abbreviations for the size
of the component expressed as the
numerator of the fraction with the
denominator always being 16. For example,
a -04 port is 4/16 or 1/4-inch. Dash
numbers are usually nominal (in name
only) and are abbreviations that make
ordering of components easier.
(1) Measure the I.D./O.D. diameter with a
caliper as shown.
(2) Under the heading MALE THREAD O.D.
and FEMALE THREAD I.D., match the
measurements with the row in table to
determine proper torque.
(3) To find the sealing surface angle, use a
protractor and measure the sealing surface
parallel to the centerline of the fitting.
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