MIL-DTL-5523E
TABLE I. Metal coatings.
Coating
Specification
Zinc Plating
ASTM B633
Chromium Plating
SAE AMS 2460
Nickel Plating
SAE AMS-QQ-N-290
Silver Plating
ASTM B700
Tin Plating
ASTM B545
Electroless Nickel
SAE AMS 2404
Aluminum Coating
MIL-DTL-83488, Type I or II
3.3.2.2 Type I components. Except for internal surfaces in constant contact with hydraulic fluid, ferrous alloys shall
have a chromium content of not less than 12 percent, or shall be suitably protected against corrosion as specified
in 3.3.2, 3.3.2.1 and table I. O-ring grooves for external seals shall not be considered as internal surfaces in constant
contact with hydraulic fluid. Use of magnesium shall be subject to the approval of the procuring activity.
3.3.2.3 Residual magnetism. Parts made of material that is capable of retaining residual magnetism, but are not
intended to function as magnets, shall be demagnetized sufficiently to prevent system or component malfunction,
including malfunction due to accumulation of magnetic contaminants.
3.3.3 Plastic parts. The use of plastic parts shall be subject to the approval of the procuring activity for the specific
application involved. Valves shall not contain plastic parts; other than AN or MS standard parts, unless otherwise
authorized by the contracting activity.
3.3.4 Standard parts. Standard parts (MS, AN, NAS, or JAN) shall be used wherever they are suitable for the
purpose, and shall be identified on the drawing by their (MS, AN, NAS, or JAN) PIN. Commercial utility parts, such
as screws, bolts, nuts, and cotter pins may be used, provided they possess suitable alteration, and provided the
corresponding standard PIN are referenced in the parts list and, if practicable, on the contractor's drawings. In the
event there is no suitable 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 Design and construction.
3.4.1 General. The configuration, dimensions, and other details of design of standard valves shall conform to
AN6279. Non-standard parts of components shall conform to the applicable manufacturer's drawing as governed by
SAE AS5440 or SAE AS8775.
3.4.2 Temperature range. Valves shall be designed and so constructed as to insure satisfactory operation
throughout the temperature range of -65°F to 160°F (-53.9°C to 71.1°C) for Type I valves.
3.4.3 Threads. Straight threads conforming to SAE AS8879, Unified Fine Thread Series, classes UNF-3A and UNF-
3B shall be used, unless it can be demonstrated that the use of other threads will result in a superior product. Pipe
threads shall not be used except for permanently installed plugs.
3.4.4 Fluids. Components shall be designed to operate with MIL-PRF-5606, MIL-PRF-83282 or MIL-PRF-87257
hydraulic fluid.
3.4.5 Seals.
3.4.5.1 General. Components shall be so designed that, in assembly of parts, sufficient clearance exists to permit
assembly of the components without damage to O-rings or backup rings where they pass threaded parts or sharp
corners. MIL-G-5514 and MS21344 shall be used for Type I system packing installation.
3.4.5.2 Packing type I valves. All packing and gaskets shall be in accordance with SAE AS28775, or SAE AS28778.
Backup rings shall be in accordance with MS28774, MS28777, or MS28783.
3.4.6 Safetying. All threaded parts shall be securely locked or safetied by safety wiring, self-locking nuts, or other
approved methods. Safety wires shall be applied in accordance with NASM 33540 and shall conform to
NASM20995. Star washers and jam nuts shall not be used as locking devices.
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