The below statements only apply if it's a plastic or phoenolic retainer. The metal retainers are guaranteed to explode long before you reach those rpms.
I would never take a metal retainer over 20k myself. I've seen way too many explode in the mid 20s and up.
Chris
ORIGINAL: DarZeelon
As to RPM limits; with oil-spray lubrication, an R6-Z/ZZ/open bearing can run at 36,000 RPM.
If grease-packed, the limiting RPM is reduced to 29,000 RPM and with contact-seals (friction), this number is reduced even further, to only 20,000 RPM.
For the RPM range of the OS.46AX, none of these limits apply, since it will never be run at over 17,000 RPM; even if spinning a toothpick prop...