MIL-DTL-13625F
3.3.2 Materials. Materials shall be as specified herein, on applicable standards or drawings, and in
applicable specifications (see 4.5.10).
3.3.2.1 Metals. Exterior metals shall be of a corrosion-resistant type or shall be treated to resist
corrosion (see 4.5.9).
3.3.2.2 Dissimilar metals. Except where necessary to complete an electrical circuit, contact between
dissimilar metals as defined in MIL-STD-889, which would encourage galvanic action, shall be avoided.
Separation of dissimilar metals shall be accomplished by providing insulation between mating surfaces
(see 4.5.9).
3.3.2.3 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and
externally. Tin content of switch components and solder shall not exceed 97 percent, by mass. Tin shall
be alloyed with a minimum of 3 percent lead, by mass (see 6.3.1)
3.3.3 Standard parts. Military standard parts shall be used wherever applicable. Commercial standard
parts may be used provided they are interchangeable without modification with the military standard parts
they replace (see 4.5.9).
3.3.5 Springs. Springs shall not be used to transmit current (see 4.5.9).
3.3.6 Locking devices. Lock washers, self-locking nuts, or other approved locking devices shall be
incorporated where specified or where required to prevent loosening of components (see 4.5.9).
3.3.7 Solder and soldering flux. Solder, when used for electrical connections, shall be composition
4.5.10).
3.3.8 Terminals. Unless otherwise specified (see 6.2), tip dimensions of round terminals for snap-on
3.3.9 Cable. Unless otherwise specified on the applicable military standard or drawing, the electrical
3.3.10 Weight. The weight of the switch shall not exceed that specified on the applicable military
standard or drawing (see 4.5.10).
3.4 Performance.
3.4.1 Overload force. When tested as specified in 4.5.6.1, the overload force ("minimum pressure")
specified on the applicable military standard or drawing shall cause no switch damage. The switch shall
subsequently meet the requirements of 3.4.2.
3.4.2 Operating force. When tested as specified in 4.5.6.2, the average force ("pressure") required to
actuate or close the switch shall be within the limits specified on the applicable military standard or
drawing.
3.4.3 Contact voltage drop. When tested as specified in the applicable portions of 4.5.6.3, and
determined as specified in 4.5.6.3.2, the contact voltage drop shall not exceed 60 millivolts, except as
specified in 3.4.6 for endurance test specimens.
3.4.4 Electrical overload. When tested as specified in 4.5.6.4, the switch shall carry a current equal to
150 percent of the applicable rated load without damage and shall subsequently meet the requirements of
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