MIL-PRF-17331K, PERFORMANCE SPECIFICATION: LUBRICATING OIL, STEAM TURBINE AND GEAR, MODERATE SERVICE (07-MAY-2013)

MIL-PRF-17331K, PERFORMANCE SPECIFICATION: LUBRICATING OIL, STEAM TURBINE AND GEAR, MODERATE SERVICE (07-MAY-2013)., This specification covers a single classification of steam turbine and gear lubricating oil, moderate service, for use in main and auxiliary turbines and gears, air compressors, and certain hydraulic equipment, as well as for general mechanical lubrication. The lubricating oil will be identified as follows: Military symbol - 2190 TEP AND NATO symbol - O-250.