MIL-PRF-15305F
(Non-Government standards and other publications are normally available from the organizations that prepare or
distribute the documents. These documents also may be available in or through libraries or other informational
services.)
2.4 Order of precedence. In the event of a conflict between the text of this specification and the references cited
herein, the text of this specification takes precedence. Nothing in this document, however, supersedes applicable laws
and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Specification sheets. The individual part requirements shall be as specified herein and in accordance with the
applicable specification sheet. In the event of any conflict between the requirements of this specification and the
specification sheet, the latter shall govern (see 6.2).
3.2 Qualification. Coils furnished under this specification and covered by specification sheets (or military
standards) listed in supplement 1B shall be products which are qualified for listing on the applicable qualified products
3.3 Material. The materials for each part shall be as specified herein; however, when a definite material is not
specified, a material shall be used which will enable the coils to meet the performance requirements of this
specification. Acceptance or approval of any constituent material shall not be construed as a guaranty of the
acceptance of the finished product. Reclaimed materials shall be used to the maximum extent possible.
3.3.2 Flammable materials. In so far as practicable, materials used in the construction of the coils shall be
nonflammable and nonexplosive.
3.3.3 Corrosive materials. Corrosive materials used in any of the manufacturing processes shall be removed or
neutralized so that no corrosion will result from such use. In so far as practicable, materials used in the construction of
coils shall be noncorrosive.
3.3.4 Threaded parts.
Threaded parts shall be of corrosion-resistant material or shall be protected against
corrosion.
3.3.5 Screws, nuts, and washers. All mounting and terminal screws, nuts, and washers shall be corrosion-
resistant material or shall be protected against corrosion.
3.3.6 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin
content of coil components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3
percent lead, by mass (see 6.8).
3.3.7 Solder and soldering flux. Solder and solder flux shall be of such quality as to enable the coil to meet all
requirements of this specification. In addition, solder shall have a liquidus melting point greater than +270°C. Additional
information and guidance on solder and soldering flux is provided in 6.9.
3.4 Design and construction. Coils shall be of the design, construction, and physical dimensions specified (see
3.1).
3.4.1 Threaded parts. Unless otherwise specified (see 3.1), all threaded parts shall be in accordance with FED-
STD-H28.
3.4.1.1 Engagement of threaded parts. Unless otherwise (see 3.1), all threaded parts shall engage by at least
three full threads.
3.4.2 Terminals. Terminals shall be of the shape and physical dimensions specified (see 3.1).
3.4.2.1 Solderable/weldable lead terminals. Unless otherwise specified (see 3.1), the manufacturer shall verify
that the leads conform to one of the solderable/weldable lead type of MIL-STD-1276 or an approved equivalent..
3.4.2.2 Winding ends. The termination of the winding ends shall not depend on solder alone to attain mechanical
strength.
3.4.3 Weight. Coils shall not exceed the weight specified (see 3.1).
3.5 Thermal shock. When coils are tested as specified in 4.6.2, all windings shall be electrically continuous (see
3
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