What is the designation for a tapered bore on spherical roller bearings? NTN follows the ISO precision tolerance classes of P0, P6, P5, P4 and P2, which are
White Paper on bearing tolerance and precision levels including definitions and specifications of ABEC and RBEC precision levels . ABEC 3, Class 6, P6.
The single row radial contact ball bearing is the most common rolling bearing. Besides the type series in compliance with boundary dimensions according to ISO
NF203M NF203ETN1 NUP203 RNU203M NJ203V N204 N204M N204ETN1 NU204 . RNU6/59.422V/P6 NNU4917K/W33 NNU4920K/W33 NNU4921K/W33 NNU4922K/W33 . Meanwhilewealsoprovidetheimperial(non-standard)bearing
ABEC precision levels, ABEC-1, ABEC-3, ABEC-5, ABEC-7, and ABEC-9 are the equivalent to ISO precision levels P0, P6, P5, P4, and P2 respectively.