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A Manufacturer Part Number describes many details of a bearing, including features, sizes, and lubrication. Each section throughout this guide gives an example of how to read a number. The following example is taken from the Tapered Roller Bearing Section. Prefix. NTN. 4T…Case hardened. Timken Koyo NTN. J ….
Koyo's efforts in R&D resulted in our newly devel- oped RD type sealed ball bearings to satisify these demands. With torque as low as that of non-contact sealed ball bearings, yet a seal nearly as tight as contact type product, superior protection from water and dust has been achieved.
[Notes] 1) Illustration (a) of the ZZ type shows the relatively small size bearing. 2) Illustration (d) of the 2RS type shows the relatively small size bearing. 3) The operating temperature range listed is for the standard type. It can be widened by using a different type of grease or sealing material. Consult with JTEKT for details.