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|  MIL-H-8890(ASG)
3.2 Detail specification. - In addition to this specification, a detail
specification will be prepared for each caponent. Were the requirements for a
component differ from those contained herein, they will be specified by the detail
speification, which shall govern.
3.3 Materials shall conform to applicable specifications and
shall be suitably processed. Materials which are not governed by applicable
specifications may be used, provided it can be demonstrated that their use will
result in a superior product.
3.3.1 Metals.- All metals shall be compatible with the fluid, temperature,
service, and storage conditions to which the component will be exposed. The
metals shall possess corrosion-resistant characteristias on internal and external
surfaces or shall be protected by the use of permanent coatings to resist corro-
sion which may result from hydraulic fluid, dissimilar metal combinations,
moisture, salt spray, and high-temperature deterioration, as applicable.
3.3.1.1 Stabilization.- For structural or dimensional stability, or both,
a cold stabilization treatment is considered necessary operation in the fabrica-
tion of critical parts made from certain materials. Where such materials are
used, the detail specification shall specify the materials and the processing
required.
3.3.2 Plastic parts.- The use of plastic parts shall be subject to the
approval of the procuring activity for the specific application involved.
3.3.3 Selection of materials.- Specifications and standards for all
materials, parts, and Government certification and approval of processes and
equipment, which are not specifically designated herein and which are necessary
for the execution of this specification, shall be selected in accordance with
Standard MIL-STD-143 or as specified in the contract or order, except as provided
in 3.3.3.1.
3.3.3.1 Standard parts - Standard parts (MS, AN, or JAN) shall be used
wherever they are suitable for the purpose, and shall be Identified on the
drawings by their part-numbers. Commercial utility parts such as screws, bolts,
nuts, and cotter pins may be used, provided they possess required properties and
are replaceable by the standard parts (MS, AN, or JAN) without alteration, and
provided the corresponding standard part numbers are referenced in the parts list
and, if practicable, on the contractor's drawing. In the event there is no
corresponding standard part in effect on date of invitation for bids, commercial
parts may be used provided they conform to all requirements of this specification.
3.4.1 Fluid.- The hydraulic fluid used shall be ML0-8200, or as approved
by the procuring activity. If the maximum system fluid temperature does not
o
exceed 400 F, the fluid used shall conform to Specification MIL-H-8446.
3
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