MIL-DTL-3970F
DEPARTMENT OF DEFENSE STANDARD
MIL-STD-202
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Electronic and Electrical Component Parts.
(Copies of these documents are available online at https://assist.daps.dla.mil/quicksearch/ or
https://assist.daps.dla.mil/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D,
Philadelphia, PA 19111-5094.)
2.3 Non-Government publications. The following documents form a part of this document to the extent specified
herein. Unless otherwise specified, the issues of the documents are those cited in the solicitation or contract (see
6.2).
ASME INTERNATIONAL (ASME)
ASME Y14.5M
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Dimensioning and Tolerancing.
(Copies of this document are available online at https://www.asme.org or from ASME INTERNATIONAL, Three Park
Avenue, New York, NY 10018.)
NATIONAL CONFERENCE OF STANDARDS LABORATORIES (NCSL)
NCSL-Z540.3
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Calibration Laboratories and Measuring and Test Equipment.
(Copies of the above document are available online at https://www.ncsli.org or from National Conference of
Standards Laboratories (NCSL), 2995 Wilderness Place, Suite 107, Boulder CO 80301-5404.)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the
text of this document and the references cited herein (except for related specification sheets), the text of this
document 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 item 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.
3.2 First article. Assemblies furnished under this specification shall be products that have been tested and passed
3.3 Materials. Materials shall be as specified herein (see 3.1); however, when a definite material is not specified, a
material shall be used which will enable the assemblies 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 (see 4.7.1).
3.3.1 Aluminum and aluminum alloy surfaces. Except for interior and mating surfaces, all aluminum or aluminum
alloy surfaces must be finished in accordance with MIL-DTL-14072, type I, finish P513B.
3.3.2 Copper or copper alloy surfaces. Except for interior and mating surfaces, all copper or copper alloy surfaces
must be finished in accordance with MIL-DTL-14072, type I, finish P213.1B.
3.3.3 Dissimilar metals. Unless suitably protected against electrolytic corrosion, dissimilar metals shall not be used
in intimate contact with each other (see 6.4.1).
3.3.4 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin
content of rigid waveguide assembly components and solder shall not exceed 97 percent, by mass. Tin shall be
alloyed with a minimum of 3 percent lead, by mass (see 6.6).
3.4 Interface and physical dimensions. Assemblies shall be of the design, interface, and physical dimensions
specified (see 3.1 and 4.7.1). Dimensions and tolerances shall be interpreted in accordance with ASME-Y14.5M.
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