MIL-PRF-24236D
3.4.5 Weldability. Leads designed for weldability shall conform to the requirements of MIL-STD-1276, composition
K. or equivalent.
3.4.6 Screw terminals. Screw terminals shall be provided with hardware as specified (see 3.1 and 6.2.2). Lockwashers
shall be captive to the screw. For direct Government orders, all terminal hardware shall be installed on the switch.
3.5 Interface and physical dimensions. Switches shall be constructed to insure proper operation when mounted in
any position. The switches shall meet the interface and dimensions specified (see 3.1).
3.5.1 Hermetic enclosure (when applicable, see 3.1 and 6.2.2). A hermetic enclosure shall be constructed so as to
be gas tight by complete sealing of glass or ceramic to metal on bonding metal to metal by fusion, and unless
otherwise specified (see 3.1 and 6.2.2), hermetically sealed switches shall be sealed by soldering, welding, or
brazing. Sealed switches shall be dried and backfilled with dry gas with a dew point less than -65 degrees C.
3.5.2 Tamperproof calibration. Unless otherwise specified (see 3.1 and 6.2.2), the switches shall be so sealed that
any tampering with the calibration after final adjustment by the manufacturer shall require dismantling of the switch or
the breaking of a seal. The seal shall not be easily broken by manual force or without the use of any device
considered a tool, for example, screwdriver, pliers, soldering iron, and so forth.
3.5.3 Environmental test effect (unless otherwise specified, see 3.1). Exposure to any single environmental test
shall not change the initial operation point by more than the initial tolerance and an additional ± 3°F. Exposure to two
or more environmental tests, including endurance, shall not change the operation point by more than the initial
tolerance and ± 5°F in the temperature range 0°F to 350°F and an additional 8°F outside this range.
3.5.4 Solder terminals. Solder terminals shall be treated to facilitate soldering. The terminal design shall be such
that a mechanical connection can be made prior to soldering. Acceptable solder terminal designs are turret, hook,
pierced, or post type.
3.5.5 Mounting. Mounting shall be as specified (see 3.1 and 6.2.2). Stud mounting shall have threads in
accordance with FED-STD-H28.
3.7 Solderability. When switches are tested as specified in 4.6.2, 95 percent of the total length of fillet, which is
between the standard wrap wire and the terminal, shall be tangent to the surface of the terminal being tested. There
shall be no pinholes, voids, and so forth. A ragged or interrupted line at the point of tangency between the fillet and
the terminal under test shall be considered a defect. After the test, there shall be no evidence of fracture, loosening
of parts, or any other mechanical failure of the switches.
3.8 Calibration. When switches are tested as specified in 4.6.3, the operating points for the opening and closing
temperature shall be within the tolerances specified (see 3.1 and 6.2.2). Switches that are rated for minimum current
(see 3.31) or low level (see 3.30) shall be subjected to only these loads during qualification, group A, and group B
testing.
3.9 Creepage (applicable to type I switches only, see 3.1 and 6.2.2). When switches are tested as specified in
4.6.4, the opening and closing of switch contacts shall occur simultaneously with, and as a result of, the disc snap.
3.10 Sensitivity response (when specified, see 3.1). When switches are tested as specified in 4.6.5.1, the time
required for the switch to actuate and deactuate shall not exceed 10 seconds.
3.11 Temperature anticipation (when specified, see 3.1 and 6.2.2). When switches are tested as specified in 4.6.6,
the switches shall not operate.
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