MIL-DTL-15291G
3.3 Switch types. Switches furnished under this specification shall be as specified in 3.3.1 and 3.3.2.
3.3.1 Switches covered by specification sheet and identified by PINs. Switches which are completely
3.3.2 Switch types not shown on a specification sheet. Where the specification sheet does not show a
specific switch type (see 3.3.1), the individual part requirements shall be as specified in complementary
documents such as manufacturer's drawings or data sheets (see 6.2). The switches shall be a product of
the basic style, design and construction as the switches shown on the specification sheets and shall be
acquired from a source listed on the qualified products list for the same specification sheet (see 3.2).
Unless otherwise specified (see 6.2), the individual switch shall comply with the inspection requirements
shown in 4.6.
3.4 Material. Unless otherwise specified (see 6.2), material shall be as specified herein. When a
definite material is not specified, a material which will enable the switches to meet the performance
requirements of this specification shall be used. Acceptance of any constituent material shall not be
construed as a guarantee of the acceptance of the finished product.
3.4.1 Metals. Metals shall be of sea water corrosion-resistant alloys or shall be zinc plated in
or anodized in accordance with MIL-A-8625 (aluminum alloys only), to resist corrosion.
3.4.1.1 Aluminum. Aluminum shall not be used for major structural parts, such as the front plate,
bushing, shaft, detent, and shall not be used for current carrying.
3.4.1.2 Ferrous material. Ferrous material shall not be used for current carrying parts.
3.4.1.3 Dissimilar metals. When dissimilar metals are used in intimate contact with each other,
protection against electrolysis and corrosion shall be provided. The use of dissimilar metals in contact,
which tend toward active electrolytic corrosion (particularly copper alloys, copper, steel used in contact
with aluminums or aluminum alloy) is not acceptable. However, metal plating or metal spraying of
dissimilar base metals to provide similar or suitable abutting surfaces is permitted. The use of dissimilar
metals separated by a suitable insulating material is also permitted.
3.4.1.4 Lubrication.
3.4.1.4.1 Operating mechanism. The operating mechanism and other mechanical moving parts shall
be lubricated with a compound that shall enable the switch to meet the performance requirements of this
document. For additional information and guidance on lubricating compounds see 6.10.
3.4.1.4.2 Contacts. Contacts shall be lubricated to enable the switch to meet the performance
requirements of this document. For additional information and guidance on lubricating compounds see
6.10. The method for fabricating the contacts shall result in the application of a minute amount of
lubrication on the contacts.
3.4.1.5 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 6.16).
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