Ultraviolet-Exposure Environments
Ordinary bearings cannot be used in environments exposed to ultraviolet-rays as grease becomes hardened in such an environment. Plastic bearings are most suitable for ultraviolet-exposure, because they do not need lubrication, and are highly resistant to ultraviolet rays.
Recommendations
PTG-A
[Inner and outer ring material] – [Ball material]
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For more information about tolerances and other issues, download a catalogue from here.