MIL-DTL-43607J
4.5.1.3 Drop test, ambient temperature. The test shall be conducted with the padlock at room
temperature, 70ºF ± 10ºF (21ºC ± 5ºC). The surface on which the padlock shall be dropped, shall be
0.5-inch (12.7 mm) thick steel plate fastened to a Portland cement concrete base. The padlock shall be
locked and dropped not less than 10 times from a height of 6 feet (1.83 m) onto the steel plate. The
drops shall be free drops, but manipulated so that the padlock strikes the steel surface not less than
once on each of its six major surfaces (i.e., top, bottom, front, back, and both sides). After the 10
drops, unlock the padlock with the control key and then remove the cylinder. Examine the padlock.
Fracture of any component or malfunction of the padlock shall constitute failure of this test (see
3.5.2.2).
4.5.1.4 Drop test, high temperature. Support the locked padlock in a hanging position where it can
be easily removed without opening the shackle. Insert a thermocouple with a temperature range of at
least 0 to 1800°F (-18 to 982°C) into the keyway. Heat the body of the padlock to a temperature of
1200°F (649°C) with a heating torch. Do not concentrate the heating flame on one location, but use a
brushing motion of the flame. When the thermocouple indicates 1200°F (649 °C), maintain the
temperature for not less than 3 minutes. Then remove the flame and lift the padlock from its support
with tongs. Within 2 seconds of removing the flame, drop the padlock onto a steel plate as specified
in 4.5.2.3, from a height of 3 feet (0.9 m). Immediately pick the padlock up and drop it four more
times from the same height onto the same surface. If the padlock shackle opens after any drop, or
opens by means other than by using the proper key, this constitutes failure of the test. Perform tests of
4.5.1.2 to determine malfunction or damage from dropping (see 3.5.2.3).
4.5.1.5 Shackle pull-out test. The test shall be conducted with the padlock at room temperature,
70ºF ± 10ºF (21ºC ± 5ºC). Clamp the locked padlock in a device that will bear against the shroud of
the body, but not interfere with the shackle. Apply a tension load of 12,000 lbf (53,378 N) at a
gradually increasing load (no sudden impact) on the vertical center line of the padlock so that a direct
end equal tension is applied to each leg of the shackle. If the shackle pulls out of the padlock, it shall
constitute failure of this test (see 3.5.2.4).
4.5.1.6 Low temperature shock test. Install and lock the padlock on a MIL-DTL-29181 hasp or
fixture of low temperature-resistant metal that simulates the support and access of this hasp. Cold
soak the padlock until the temperature is stabilized at not higher than -100°F (-73°C) and attempt to
break the padlock by striking it with a 3 lb (1.36 kg) double-faced engineers hammer no less than six
times. Swinging of the hammer shall be performed while grasping the end of the handle with both
hands. Striking of the padlock shall be done while the padlock is within 5°F (2.8°C) of
-100°F (-73°C). If the padlock opens, shatters, or fails the tests of 4.5.1.1 and 4.5.1.5 after striking for
5 minutes or less lapsed time at the low temperature, the padlock has failed the test (see 3.5.2.5).
4.5.1.7 Forced entry test. A hasp from MIL-DTL-29181 shall be secured to a solid upright post or
wall supported heavy plate in a manner capable of surviving the forces of this test. The padlocks to be
tested shall be locked onto the hasp. One padlock shall be tested using only non battery powered tools
and one padlock shall be tested using only battery powered tools.
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