MIL-DTL-28788C
3.4.2 Insulation.
3.4.2.1 Plastic. Unless otherwise specified (see 3.1 and 6.2), molded plastic material shall conform
to ASTM-D5948, except that cotton-, wood-, or cellulose-filled molding materials shall not be used.
3.4.2.1.1
Thermoplastics. Thermoplastics shall not be used.
3.4.2.2 Ceramic. Ceramic insulation shall used which will enable the switch to meet the
performance requirements of this specification.
3.4.3 Rubber. Rubber parts except media seals shall be in accordance with A-A-59588.
3.4.4 Weldability. Leads designed for weldability shall conform to requirements of MIL-STD-1276,
type K.
3.4.5 Potting compounds. Unless otherwise specified (see 3.1), potting compounds shall be in
their specified temperature ranges.
3.4.6 Fungus resistant material. Unless certification is furnished, materials for fabrication of
switches covered by this specification shall conform to requirement 4 of ASTM-G21. When nutrient
materials are used, they shall be treated prior to fabrication of the switches.
3.5 Design and construction. Switches shall be of the design, construction, and physical dimensions
specified (see 3.1), and shall be so constructed as to ensure proper operation when mounted in any
threads in accordance with FED-STD-H28.
3.5.2 Termination. Termination shall be as specified (see 3.1).
3.5.2.1 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. Gold plating shall not be used.
3.5.2.2 Screw terminals. Screw terminals shall be provided with hardware as specified (see 3.1 and
6.2). Lockwashers shall be captive to the screw. For direct Government orders, all terminal hardware
shall be assembled in proper order.
3.5.3 Screw threads. Screw threads on removable threaded parts shall be in accordance with
unified thread series of FED-STD-H28. Threading of nonmetallic parts shall not be permitted. Terminal
threading engagement shall be at least two full threads.
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, that is, screwdriver, pliers, soldering iron, and so
forth.
3.5.6 Actuating mechanism. The external actuator shall be insulated from all current-carrying
parts.
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