NTN 7000AC/DF bearing

NTN is one of the world's leading manufacturers of bearing products to OEMs, distributors, and end users.

What is the nomenclature for Precision Bearings (P4, P5, Tolerances)?; What is the difference between T & D1 or what is the designation for an oil hole? What is the . is required for the application. DF arrangements have a very short spread between centers and should be applied when slight shaft misalignment is needed.