MIL-DTL-21604F
4.8 Examination and tests. Examination and tests shall be as specified in 4.8.1 through 4.8.15 (see 6.3).
4.8.1 Visual and mechanical examination. Switches shall be examined to verify that the design, construction,
physical dimensions, marking, and workmanship are in accordance with the applicable requirements (see 3.1, 3.4
4.8.2 Circuit configuration (see 3.6). Switches shall be tested to determine conformance to the actual open and
closed switch circuit conditions including shorting and nonshorting functions to the applicable diagram (see 3.1 and
6.2). Each contact of each deck shall be tested. Suitable circuitry shall be used. Switches with adjustable stops
shall be adjusted to give the maximum number of switching positions possible.
4.8.3 Strength of mounting bushing (see 3.7). Bushing mounted switches shall be mounted on a metal panel
using normal mounting means and hardware. A torque of 50 inch-pounds shall be applied to the mounting nut on
switches with .469 inch (11.91 mm) diameter bushings or larger and a torque of 25 inch-pounds shall be applied to
the mounting nut on smaller size bushings. The mounted switch body shall additionally be subjected to a torque of 5
inch-pounds with the nonturn device mounted on the switch in the normal manner.
4.8.4 Torque (see 3.8). Switches shall be mounted by their normal mounting means.
4.8.4.1 Rotational. The torque required to rotate the switch shaft with respect to the switch body shall be
measured by a torque wrench or other torque measuring device. The switch shaft shall be rotated from each
maintained position to the adjacent positions in both directions.
4.8.4.2 Stops (applicable only to switches with stops). Unless otherwise specified (see 3.1), a torque of 100 inch-
pounds shall be gradually applied to the shaft with the shaft in an extreme rotational position. Mating switch section
contacts shall be monitored for opening or closing of contacts as required in the stop position.
4.8.5 Terminal strength (see 3.9). The number of terminals tested shall equal the number of terminals in one deck
and they shall be selected to include one terminal in each position and, where possible, not more than one terminal in
each deck. If the number of positions exceeds the number of decks, additional terminals in each deck shall be tested
to cover all positions.
4.8.5.1 Pull. Unless otherwise specified (see 3.1), a force of 5 pounds shall be applied to the terminals at the
normal location for attaching lead wires. The pull shall be gradually applied and maintained for 10 seconds in each of
the following mutually perpendicular directions:
a.
Tangent to the deck.
b.
Parallel to the switch axis.
c.
Perpendicular to both the switch axis and the tangent to the deck.
4.8.5.2 Torque. Terminals of the switches shall be tested in accordance with method 211, test condition E, of MIL-
STD-202, and shall be subjected to a torque of 7.5 inch-pounds, and shall be maintained for 10 seconds. This test
shall be made on terminals previously subjected to the pull test. The torque shall be applied 10 times in each
direction.
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