MIL-DTL-13623E
3. REQUIREMENTS
3.1 First article and conformance inspections. First article and conformance inspections and tests
shall be required as specified in 4.3, 4.4 and 4.5, respectively. Samples for these tests shall be furnished
dimensional inspections, rough handling tests, and leakage tests shall conform to the inspections and test
3.2 Design and construction. Switches and assemblies shall conform to this specification and to
MIL-DTL-13623/1, A-A-52536, or, when specified, other applicable standards or drawings (see 4.6.1 and
6.2).
3.2.1 Materials. Materials shall be as specified herein, in applicable specifications and drawings or
standards. Materials not specifically designated shall be appropriate for use in the assembly conforming
to the requirements herein and in applicable specifications (see 4.6.1).
3.2.1.1 Dissimilar metals. Except where necessary to complete an electrical circuit, contact between
dissimilar metals, which would encourage galvanic action shall be avoided. Separation of dissimilar
metals shall be accomplished by providing insulation between mating surfaces (see 4.6.1).
3.2.1.2 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 6.5)
3.2.2 Clearance. Clearance between any current-carrying and other conducting parts of different
potential shall be no less than .062 (1.57mm) inch through air or insulation (see 4.6.1).
3.2.3 Standard parts. Military standard parts shall be incorporated wherever applicable. Commercial
standard parts may be used provided they are interchangeable with Military Standard (MS) parts without
modification, and the equivalent MS part is identified by the manufacturer (see 4.6.1).
3.2.4 Threaded parts. All screw threads shall conform to FED-STD-H28.
3.2.5 Springs. Springs shall not be used to transmit current (see 4.6.1).
3.2.6 Locking devices. Lockwashers, self-locking nuts, or other approved locking devices shall be
incorporated where specified or where required to prevent loosening of components (see 4.6.1).
3.2.7 Solder. Solder shall conform to composition Sn50, Sn60, or Sb5 of J-STD-006. A rosin flux
shall be used (see 4.6.1).
3.2.8 Plastic. Molded insulation material shall conform to type MPE requirements of ASTM-D5948
(see 4.6.1).
3.2.10 Interchangeability. The switch shall be interchangeable to the extent that external dimensions
shall be within the envelope outline of the applicable drawing or standard. Electrical connectors, shaft
and mounting dimensions and location shall conform to the detail requirements of the applicable drawing
(see 4.6.2).
3.2.11 Weight. The weight of the switch shall be in accordance with the weight requirements of the
applicable drawing (see 4.6.2).
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