MIL-DTL-87104C
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Aluminum and Aluminum Alloy, Bar, Rod, Wire, or Special Shapes;
Rolled, Drawn, or Cold Finished; General Specification for.
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Cable, Power, Electrical, Portable General Specification for
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Steel Bars, Wire, Shapes, and Forgings; Corrosion Resistant (inactive).
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Castings, Classification and Inspection of.
(Application for copies should be addressed to: SAE International, 400 Commonwealth Drive, Warrendale, PA
15096-0001; https://www.sae.org or standards@sae.org.)
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, 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 Detail specification. The individual coaxial assembly requirements shall be as specified herein and in
accordance with the applicable detail specification. When the requirements of the detail specification and this general
specification conflict, the requirements of the detail specification shall govern.
3.2 First article approval. Coaxial assemblies furnished under this specification shall be products that have been
3.3 Parts, materials, and processes. Unless otherwise specified in the detail specification, parts, materials, and
processes for the assembly shall be in accordance with the requirements specified herein. However, final approval of
the equipment shall be contingent upon the equipment meeting all specification requirements.
3.3.1 General requirements.
3.3.1.1 Approval of nonstandard parts and materials.
3.3.1.1.1 Contract category. Contract requirements for nonstandard parts and materials approval shall be
category III: Contracts for production equipment. These contracts will usually include requirements for a prototype or
first article model.
3.3.1.1.2 Approval procedures. Approval of nonstandard parts shall be in accordance with procedures approved
by the acquiring activity (see 6.3).
3.3.1.2 Part selection control. Selection of parts shall be controlled in accordance with the requirements approved
by the acquiring activity (see 6.3).
3.3.1.3 Castings. Castings are to be in accordance with the following:
a. Die castings. Die castings should not be used where the casting might be subject to impact. Zinc
alloy die castings should not be used where dimensional changes of the casting could affect use of
equipment.
b. Porous castings. When required, castings should be impregnated in accordance with
c. Classification and inspection. Castings should be classified and inspected in accordance with
d. Inserts. Inserts which are intended to be cast in place should be knurled, grooved, or otherwise
prepared to secure satisfactory keying of the insert to the casting. Inserts should be fabricated from
a material which is not adversely affected by exposure to the molten casting alloy. When inserts
are located near a casting edge, sufficient edge distance should be allowed in order to develop the
required resistance to insert pull-out, and to avoid cracking of the casting. Casting defects resulting
from use of inserts, such as partial alloying, poor bonds, porosity, and cracks should not be present.
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