MIL-DTL-5421D
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. When specified (see 6.2), a sample shall be subjected to first article
inspection in accordance with 4.3.
3.3 Materials. Materials shall be specified herein. Materials that are not specifically
designated shall be of the best commercial quality and suitable for the purpose intended.
3.3.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered,
or environmentally preferable materials should be used to the maximum extent possible provided
that the material meets or exceeds the operational and maintenance requirements and promotes
economically advantageous life cycle costs.
3.3.2 Metals. Metals shall be corrosion resistant unless protected to resist corrosion
during normal service life.
3.3.3 Nonmagnetic materials. Nonmagnetic materials shall be used for all parts of the
tube except where magnetic materials are essential.
3.4 Standard parts. MS or AN standard parts shall be used wherever they are suitable for
the purpose. They shall be identified on the drawing by their parts numbers. Commercial utility
parts such as screws, bolts, nuts, and cotter pins may be used provided they possess suitable
properties and are replaceable by the MS or AN standard parts without alteration and provided the
corresponding standard parts numbers are referenced in the parts list and, if practicable, on the
contractors drawings. In the event there is no suitable corresponding standard part in effect on the
date of invitation for bids, commercial parts may be used provided they conform to all
requirements of this specification.
3.5 Design and construction. The design of the tubes shall conform to AN5811, AN5812,
and SAE AS5813 as specified. The tubes shall be constructed so that no parts will work loose in
service. The tubes shall be built to withstand the normal strains of jars, vibrations, and such other
conditions as are incident to shipping, storage, installation, and service without failure.
3.5.1 Finish. Protective coatings and finishes shall not be used that will crack, chip, or
scale during normal service life or due to extremes of atmospheric conditions.
3.5.1.1 Tube exterior. The tube exterior shall be finished with a durable dull color
acceptable to the procuring activity.
3.5.1.2 Aluminum-alloy parts. Aluminum-alloy parts shall be covered with an anodic
film conforming to MIL-A-8625.
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