MIL-PRF-83363E
3.3 Properties of finished fluid. The properties of the finished fluid shall be as specified in 3.3
when tested as specified in section 4.
3.3.1 Unworked penetration. The unworked penetration (as measured in units of 0.1 mm) of the
grease shall be a maximum of 340 when tested as specified in 4.4.1.
3.3.2 Worked penetration. The worked penetration (as measured in units of 0.1 mm) of the
grease shall be a maximum of 340 when tested as specified in 4.4.1.
3.3.3 Worked stability. The penetration (as measured in units of 0.1 mm) of the grease after
working 100,000 double strokes shall be a maximum of 375 when tested as specified in 4.4.1.
3.3.4 Evaporation. The grease shall not lose more than 5 percent of its weight after 22 hours at
300°F (148.9°C) when tested as specified in 4.4.1.
3.3.5 Oil separation. The grease shall not lose more than 10 percent of its weight after 30 hours
at 300°F (148.9°C) when tested as specified in 4.4.1.
3.3.6 Load wear index. The load wear index value of the grease shall be not less than 90 when
tested for load carrying capacity as specified in 4.4.1.
3.3.7 Steel on steel wear. When tested as specified in 4.4.1 the wear scar diameters shall not be
greater than those listed in table I. The temperature shall be monitored and recorded for the ambient
temperature, four hour test and the temperature shall be regulated at 167°F (75°C) for the two hour test.
TABLE I. Steel on steel wear test
Specimen Material
Test Duration
Temperature, °F
Scar Diameter (mm)
AISI-E-52100 Steel
2 hours
167 (75°C)
1.30 maximum
AISI-E-52100 Steel
4 hours
Ambient
1.30 maximum
3.3.8 Low temperature torque. A number 6204 open ball bearing lubricated with grease shall
give a starting torque of not more than 3,000 g-cm and a running torque of not more than 1,000 g-cm
when tested as specified in 4.4.1.
3.3.9 Storage stability. After storing for six months as specified in 4.4.2, the worked penetration
(as measured in units of 0.1 mm) of the grease shall not have changed from the original worked
penetration by more than 30 points. The unworked penetration shall be a minimum of 250 (as measured
in units of 0.1 mm).
3.3.10 Workmanship. The grease shall be a high quality, smooth, homogenous product, free
from abrasives and impurities when examined as specified in 4.4.3.
3.4 Recycled, recovered, environmentally preferable or biobased materials. Recycled,
recovered, environmentally preferable or biobased 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.
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