MIL-DTL-27166F
3.2.1 Commercial parts.
Commercial parts having suitable properties may be used where, on the date of invitation for
bids, there are no suitable standard parts. In any case, commercial utility parts, such as screws,
bolts, nuts, and cotter pins, having suitable properties may be used provided:
a. They can be replaced by the standard parts (AN or MS without alteration).
b. The corresponding standard part numbers are referenced in the parts list and, if
practicable, on the contractor's drawings.
3.2.2 AN and MS standard parts.
With the exception specified in 3.2.1, AN and MS standard parts shall be used where they suit
the purpose. They shall be identified on the drawings by their part numbers.
3.2.3 Part numbering of interchangeable parts.
All parts having the same manufacturer's part number shall be functionally and dimensionally
interchangeable. The item identification and part number requirements of MIL-STD-31000 (see
6.2) shall govern manufacturer's part numbers and changes thereto.
3.3
Materials.
All materials shall be as specified herein. Materials not specified shall be of the best quality
used for the purpose in commercial practice. The materials shall be free from all defects or
imperfections that might affect the serviceability of the finished product. Recovered or recycled
materials may be used provided the end product is capable of passing the first article tests.
3.3.1 Metals.
Metals shall be of the corrosion-resistant type or suitably treated to resist corrosion or
atmospheric conditions likely to be met in storage or normal service. MIL-STD-889 shall be
utilized to determine compatibility of metals from which the valves are fabricated.
3.3.2 Protective treatment.
When materials used in the construction of the valves are subject to deterioration when exposed
to climatic and environmental conditions likely to occur during service usage, they shall be
protected against such deterioration i n a manner that will in no way prevent compliance with
the performance requirements of this specification. The use of any protective coating that will
crack, chip, or scale with age or extremes of climatic and environmental conditions shall be
avoided. Protective treatments used shall be non-hazardous and-environmentally safe.
3.3.3 Non-metals.
When utilized, non-metallic parts such as packings, interior gaskets, and valve seats shall be of
the oil-resistant type.
3.3.4 Exterior gaskets.
Exterior gaskets for sealing valves to the container shall be made of silicone rubber conforming
to A-A-59588 class 2 or 3, grade 60. No additional sealing material shall be required.
3.4
Construction.
3.4.1 Gasket seat.
Unless otherwise specified, valves employing exterior gaskets shall be provided with a groove
to retain and seat such gaskets. The depth of the groove shall not be less than 50 percent nor
more than 70 percent of the original gasket thickness.
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