A cylindrical roller bearing used for the main spindle of a machine tool can ② Single-row cylindrical roller bearings. NN type. Tapered bore. Cylindrical bore. NNU type. Tapered bore. Cylindrical P4：JIS class 4 UP：Special high precision.
There are different types designated as NU, NJ, NUP, N, NF (for single-row bearings), NNU, and NN (for double-row bearings depending on the design or
Angular contact thrust ball bearings for screw drives 243. Locking .. Special mounting recommendations for high-precision bearings . 84 .. Double row cylindrical roller bearings, NNU design (8) P4. 5. ABEC 5. P5. UP. 2. ABEC 9. P2. 4. ABEC 7. P4. 1) ISO 492:2002 or ISO 199:2005. 2) ANSI/ABMA
Axial-radial cylindrical roller bearings. Angular contact thrust ball bearings for screw drives. Precision Attainable speeds for typical spindle bearing systems .