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|  MIL-S-4040F
3.2 First article inspection. When specified (see 6.3), a sample shall be subjected to first article inspection in
accordance with 4.5.
3.3 Materials. The materials shall be as specified herein. When a definite material is not specified, a suitable
material shall be used which will enable the solenoids to meet the performance requirements of this specification.
Acceptance or approval of any constituent material shall not be construed as a guaranty of acceptance of the finished
product.
3.3.1 Fungus resistant materials. Nonmetallic parts of the solenoid shall be inherently nonfungus nutrient or
treated to resist fungus growth.
3.3.2 Metals. Metals shall be of a corrosion resistant type, or shall be plated or treated to resist corrosion.
3.3.2.1 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 brass, copper, or steel used in contact with aluminum or aluminum alloy), is not
acceptable. However, metal plating or metal spraying of dissimilar base metals to provide suitable abutting surfaces
is permitted. Dissimilar metals should be as defined in 6.5.
3.3.3 Plastic. Plastic material shall be of a type that will enable the solenoid to meet all the performance
requirements of this specification.
3.3.4 Wire.
3.3.4.1 Magnet wire and lead wire. Magnet and lead wire shall be of a type that will enable the solenoid to meet all
the performance requirements of this specification.
3.4. Interface and construction. Solenoids shall be of the design, construction, and physical dimensions specified
in 3.1.
3.4.1 Coils. Coils shall be evenly wound and insulated to meet the performance requirements specified herein.
Coils shall be completely insulated from the frame and other grounded parts, and the coil leads shall not be internally
grounded. Coils shall be suitably taped and impregnated as required to prevent damage under prolonged exposure
to humidity and salt-fog environmental conditions. Coils shall be securely anchored to the frame or other stationary
parts in a manner that will prevent coil movement or strain on the coil leads.
3.4.2 Terminals. Terminals, including connectors, solder-type, pig-tail, or lead-in wires shall be as specified in 3.1.
Terminals shall be constructed of corrosion-resistant material or shall be suitably plated to resist corrosion during
service.
3.4.2.1 Plug-in terminals. Plug-in terminals shall conform to the arrangements of dimensions necessary for proper
mating with the applicable connectors or sockets. The mounting arrangement of the solenoid shall be so designed
that the weight of the solenoid will be supported and the stability of its mounting will be provided by mounting means
other than the electrical terminals of the socket. Solenoids with plug-in terminals shall have the electrical and
environmental tests, specified in section 4, performed with the appropriate or specified socket or connector
assembled to the solenoid.
3.4.2.2 Terminal marking. When specified (see 3.1), terminals shall be permanently and legibly marked.
3.4.3 Case. Unless otherwise specified (see 3.1), the coil housing shall be enclosed and shall be electrically
isolated from any electrical circuit and shall be magnetically shielded.
3.4.4 Mounting. The mounting means shall be an integral part of the solenoid housing or shall be securely
attached thereto in a manner which will prevent any movement between the solenoid and the mounting means in
service use.
3
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