HALO 157


  • Aviation turbine oil (ATO)
  • Helicopter oil

Key attributes

  • A purpose designed lubricant with a viscosity of 9 cSt @ 100ºC and 12,700 cSt @ -32ºC
  • Excellent load carrying and antiwear performance
  • Excellent shear stability
  • Good corrosion resistance
  • Good elastomer compatibility
  • Greater inter-gear film thickness
  • High temperature stability

Product description

<P>For many years MIL-PRF-23699 approved engine lubricants were employed in helicopter gearboxes, ensuring a common lubricant for both engines and transmission systems. More recently, high-load-carrying oils have been evaluated and found to offer advantages over conventional-load-carrying MIL-PRF-23699 oils. These higher-load-carrying oils, complying with specification DOD-PRF-85734, were originally intended only for engine applications. The two MIL spec oils are thus of identical viscometric properties. Operators considered that lubrication performance of gearboxes could be enhanced by a higher-viscosity, high-load-carrying lubricant possessing improved corrosion-protective qualities. <P>Eastman HALO 157™ is a clear, amber-colored fluid with a faintly aromatic odor reminiscent of turbine engine oils. It is based on selected polyol esters, the inherent characteristics of which are enhanced by additives. It is also fully compatible and miscible with other oils approved to specifications MIL-PRF-23699 and MIL-PRF-7808. <P>Multiple tests have been completed in bearing and gearbox rigs and flight evaluations, culminating in the NATO standard (AIR STANDARD ACS 4035) for a 9-cSt advanced helicopter gearbox lubricant.

Product availability

If you are interested in learning more about product availability in your area, please complete the “Make an inquiry” form on this page.

If applicable, authorized distributors are in the regions listed below, with more details provided in the “Authorized distributors” section.

  • Asia Pacific

  • Europe, Middle East & Africa

  • North America

Authorized distributors

Please select a region and country for a list of authorized distributors. If a country is not listed for a region, contact Eastman for further information.