MIL-PRF-5503G
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 cost.
3.4 Materials. All materials shall be suitably treated to resist corrosion due to electrolytic
decomposition, salt fog, hydraulic fluid, and any other atmospheric condition that may be
encountered during operational use or storage. The use of toxic chemicals, hazardous substances,
or ozone depleting chemicals shall be avoided, whenever feasible.
3.5 Construction. (see 6.3.1)
3.5.1 Hydraulic properties. The actuator shall conform to SAE AS8775 (see 6.3.2).
3.5.2 Fillets. All internal fillets shall have radii at least 0.010 inch or 10% of the minimum wall
thickness, whichever is greater.
3.5.3 Wrench flats. If threaded end caps are used, the actuator barrel shall have standard size
wrench flats or hexes. Wrench flats or hexes shall be placed as near to the end cap as possible.
3.5.4 Seals. Actuator seals shall be in accordance with SAE AMSP83461 and seal glands and
O-ring glands shall conform to SAE AS4716.
3.5.5 Bearings. Replaceable bearings or bushings shall be used at all junction points where
motion exists. Unless the bearings are self-lubricating or permanently lubricated, lubrication
fittings conforming to SAE AS15002 or SAE AS15006 shall be provided.
3.5.6 Scraper and wiper rings. Landing gear strut actuators and utility actuators whose piston
rods are exposed to ice, dirt, or other foreign matter shall use scraper rings (see 6.3.8) installed in
a groove per MS33675. Actuator rods extended for long periods of time or subjected to high
acceleration forces shall be lubricated with felt wipers in accordance with MS28932. The use of
felt wipers for temperatures exceeding 200°F shall be as specified in the associated specification.
Actuators exposed to extreme sand and dust conditions as defined in the associated specification
shall be provided with scraper or wiper rings.
3.6 Interface.
3.6.1 Bosses. All bosses for fluid connection fittings shall conform to SAE AS5202. Tube
fittings and tubing, if incorporated in the actuator, shall conform to SAE AS5440.
3.6.2 Hydraulic fluid temperature. The actuator shall function with hydraulic fluid temperatures
from -65° to 160°F for type I or -65° to 275°F for type II.
3.6.3 End caps, lock nuts, and adjustment nuts. End caps, lock nuts, and adjustment nuts shall
have wrench flats or hexes, be knurled, or contain milled slots for spanner wrenches. If spanner
wrench slots are used, they shall be dimensioned in accordance with figure 1. Drilled hole type
nuts requiring the use of pin type spanner wrenches shall not be used. End caps, lock nuts, and
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