MIL-DTL-15743E
3.3.1 Metals. Metals shall be of a corrosion-resistant type or shall be treated to resist corrosion as
specified in MIL-E-917. Dissimilar metals, in contact with each other shall be selected to comply with the
requirements of MIL-E-917. The selection of metals in contact shall also be such as to prevent galling.
3.3.2 Nonmetallic materials. As specified in MIL-E-917, nonmetallic materials shall be nonflammable,
nontoxic, and fungus-inert.
3.3.3. Prohibited materials. Asbestos, cadmium and mercury shall not be used in the manufacture of
the enclosed switches. In addition, no parts shall have come in direct contact with metallic mercury,
mercury compounds or mercury bearing instruments or devices, employing only a single boundary of
containment, during manufacture or inspection. (A single boundary of containment is one that is not
backed up by a second seal or barrier to prevent escape and consequent mercury contamination in the
event of rupture of the primary seal or barrier.)
3.3.4 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically
advantageous life cycle costs.
3.4 Parts.
3.4.2 Switch handles. Switch handles shall be of the materials and dimensions specified (see 3.1).
Screws used to secure the handle to the shaft extension shall be corrosion resistant steel (CRES)
commercial grade.
3.4.3 Switch shaft extensions and couplings. Switch shaft extensions and couplings shall be of the
materials and dimensions specified (see 3.1). Pins used to secure the coupling to the switch shaft shall
be nickel copper alloy in accordance with QQ-N-281. Type 302 stainless steel may be used as an
alternate to meet the performance requirements of this specification.
3.4.4 Commercial (hardware) parts. Commercial utility hardware items such as screws, bolts, and nuts
may be used, provided they possess properties equivalent to and are replaceable by MS or AN part
numbers. Unless otherwise indicated (see 3.1), attaching hardware shall be as follows:
a. Screws, nuts and bolts shall be brass commercial grade except they shall be CRES commercial
grade, in aluminum enclosures.
b. Lockwashers shall be phosphor bronze, commercial grade, for brass hardware and CRES,
commercial grade for CRES hardware.
c. Washers for switch handles shall be laminated plastic, type FBS in accordance with MIL-I-24768.
otherwise specified (see 6.2), fuses shall not be furnished.
3.4.6 Fuse clips. Fuse clip retainers shall not be used with fuse clips for fuses rated 0-60 amperes.
The type shall be as specified (see 3.1).
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