Royco® 555

Product Description: A synthetic-based, 5 cSt turbine engine oil that is formulated for excellent load carrying capacity – marking t the premier fluid for use in many helicopter turbines, transmissions and gearboxes.

Specification: DOD – PRF – 85734

NATO Specification: O-160

Joint Service Designation: OX-26

MIL-SPEC Scope: This specification covers the requirements for one grade of a synthetic base helicopter transmission system lubricating oil.

Shelf Life:

  • US Military       3 Years
  • Commercial     5 Years
  • NATO                4 Years

Tariff Code:  3403.99.000

Material: Synthetic Turbine Oils
Acrylonitrile Poor to Good
Acrylonitrile-butadiene rubber (Perbunan®) Poor to Good
Butyl rubber Poor to Fair
Flurocarbon (Viton®) Very Good
Methacrylate Poor to Fair
Natural rubber/latex Poor
Poly (ethylene) Good
Polyamine (Nylon) Poor
Polychloroprene (Neoprene® ) Poor
Polyester Good
PTFE (Teflon® ) Very Good
Polyvinyl chloride (PVC) Poor
Silicone Poor to Fair
Styrene-butadiene or styene-butadiene rubber (SBR) or Buna S Poor

National Stock Number Grade Amount Container
9150-01-209-2684 1 quart Can
9150-01-210-1938 1 gal. Can
9150-01-209-3399 55 gal. Drum

Preservative Fluid, High Load Bearing, Multi-Purpose Grease, Synthetic Based Grease