TM 5-2420-230-24-1
Hoses and Fittings.
b.
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 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 headings 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.
E-4. ADI-RECOMMENDED TORQUE TABLES.
The torque values in this paragraph must be used whenever applicable. If the type or size fastener being used is not listed, refer
to Para E-5. . When using the ADI torque specification, note the following:
a. "The Recommended Assembly Torques" are for plain-finish, uncoated fasteners.
b. The torque specifications in this paragraph only apply to bolt and nut applications.
c. When a flexible gasket is used, multiply the value shown by 0.8 to find the correct torque.
d. Capscrews must have the following thread engagement: 1.5 thread diameters in steel, 2.5 thread diameters in
aluminium.
E-3
