Source of NAS 1638 Hyd Fluid Cleanliness

[alwelsh]

Does anyone know where I can get a copy of National Aeronautical Society Hydraulic Fluid Cleanliness Standards NAS 1638 Class 6 and is there any table of ISO/ANSI/SAE equivalents.

 

[atad]

The equivalent ISO standard to NAS 1638 Class 6 is

ISO 4406 : Code 17/15/11.

 

[JamesDUK]

A very old post I know but I've just been looking for a similar thing and found this document, the fluid cleanliness standards gives a good list of equivalents.

http://www.parker.com/hydraulicfilter/cat/htm-3.pdf