MIL-PRF-55339C
4.5 Methods of inspection.
4.5.1 Test methods. The following identified tests and test methods assure adapter integrity within
typical operating conditions and applications. Alternate commercial industry standard test methods
are allowed; however when an alternate method is used, the qualifying activity must be notified prior
to the performance of the test. The test methods described herein are proven methods and shall be
the referee method in case of dispute.
4.5.1.1 Visual and mechanical examination. Adapters and associated fittings shall be examined to
verify that the design, construction, physical dimensions, assembly instructions, marking and
4.5.1.2 Dimensional examination. Mating dimensions shall be examined by mating the adapter with
its applicable mating gauges or other suitable means acceptable to the Government.
NOTE: The documents listed in supplement 1 show the overall dimensions of the connector when
assembled to the appropriate cable, and the detail mating dimensions at the interface. No other
dimensions or details will be shown. The cable-end construction and other dimensions are controlled
by performance requirements of the specification, i.e., cable retention, VSWR, RF leakage, etc., with
cable in place.
contact of an unmated adapter. This force shall be applied at a rate of approximately 1 pound (4.448
N) per second until the specified force has been reached. The force shall be applied for a minimum
period of 5 seconds. After removal of specified force, the axial location of the center contact at each
end shall be determined. Each mating end of the adapter shall be tested. The torque specified (see
3.1) shall be applied to the center contact of an unmated adapter for a minimum period of 10
seconds. Each mated end of the adapter shall be tested.
4.5.3 Force to engage/disengage (see 3.6).
4.5.3.1 Bayonet and threaded types (see 3.6.1). The adapter shall be engaged with its mating
standard part (see 3.1). During the entire coupling/uncoupling cycle (until the adapter is fully
engaged/disengaged) the forces and/or torques necessary shall not exceed those specified (see 3.1).
A thread coupled adapter is fully engaged with its mating standard part when their reference planes
(see 3.1) coincide. A bayonet coupled adapter is fully engaged with its mating standard part when
the bayonet studs have passed the detent and their reference planes coincide. No additional
tightening torque shall be applied. The mating standard part is a steel jig containing the critical
interface dimensions finished to the tolerances specified, or a qualified mating connector with the
approval of the qualifying activity (see 3.1). Its spring members when applicable shall be heat treated
beryllium copper. The surface finish or mating surfaces shall be 16 microinches maximum, in
accordance with ASME B46.1.
4.5.3.2 "Push-on" connector types (see 3.6.2). The adapter under test shall be engaged with its
standard mating part (gauge). During this engaging cycle the force necessary to fully engage the
adapters shall not exceed that specified (see 3.1). Upon completion of engagement, an opposite
force necessary for disengagement shall be applied. This force shall be within the limits specified,
and shall include any unlatching forces required.
4.5.4 Coupling proof torque (see 3.7). The adapter under test shall be engaged with its mating
standard part (gauge) and the coupling nut tightened to the torque value specified (see 3.1). After
one minute the connector under test and its mating standard part shall be disengaged.
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