MIL-PRF-31031B
4.6.2.2 "Push-on" connector types (see 3.5.2). The connector under test shall be engaged with its
standard mating part (gauge). During this engaging cycle, the force necessary to fully engage the
connectors 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.
4.6.3 Coupling proof torque (see 3.6). The connector 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.
4.6.4 Mating characteristics (see 3.7). After insertion of the specified oversized pin, the specified
number of times (see 3.1), the contact to be tested shall be held rigid by means of a suitable jig or fixture.
A gauge containing the test pin or test ring and a suitable force indicating dial shall be aligned to within
0.004 TIR of any plane passing through the axis of the contact under test. Engagement or withdrawal of
the test pin or test ring shall be made smoothly and at such a rate that the dial does not bounce or
otherwise give a false reading. The test pin or test ring may be chamfered to facilitate entry, but the
specified engagement length shall not include the chamfer length and the finish shall be as specified and
in accordance with ASME B46.1.
4.6.5 Permeability of nonmagnetic materials (see 3.8). The permeability of the connector shall be
measured with an indicator conforming to ASTM A342.
4.6.6 Hermetic seal (pressurized connectors (see 3.9). Connectors shall be tested in accordance with
method 112, MIL-STD-202. The following details shall apply:
a. Test condition letter: C.
b. Procedure number: Ill.
c. Leakage rate sensitivity: 10-8 cm3 per second.
4.6.7 Leakage (pressurized connectors) (see 3.10). Connectors shall be subjected to the air pressure
specified (see 3.1) applied to one end, and the whole assembly immersed in water at a temperature of
15°C to 25°C. The connector shall remain immersed for at least 2 minutes.
4.6.8 Insulation resistance (see 3.11). The connector shall be measured with an apparatus suitable to
verify compliance with the applicable detail specification requirement. The following details shall apply:
a. Unless otherwise specified (see 3.1), the measurement error, including the error of the test voltage
source and the error of the indicating circuit, shall not exceed 10%.
b. The test voltage shall be 500 volts dc and polarity shall be such that the outer conductor is at
ground potential.
c. Unless otherwise specified (see 3.1), readings shall be taken immediately after an uninterrupted 2-
minute electrification period. However, a stable, or an increasing reading indicating compliance
with the specification requirement obtained before elapse of the 2-minute electrification period
shall be acceptable.
4.6.9 Center contact retention (see 3.12). An axial force (see 3.1) shall be applied, first in one direction
and then the other, to the center contact of an assembled and uncabled connector utilizing a method and
force measuring device suitable to the Government. The inner contact shall be inspected after the force
has been applied in one direction and again after the force has been applied in the opposite direction to
determine if the contact has been displaced from the specified interface dimensions.
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