Suffix M:

M

solid cage, axially aligned with the rolling elements

Suffix N:

-N

Outer ring + rollers (+ cage) for cylindrical roller bearings

#N

Inner ring only for cylindrical roller bearings

N

Groove for lock ring on the outer ring

N

Steel bearing e.g. P315N

N1

Cast iron bearings GS. E.g. P315N1

NR

Groove and lock ring on the outer ring

NRS

Groove and lock ring on the opposite side (contrast to the standard)

N2

Retaining groove

Suffix P:

PM

Special precision bearings for electric motors

P42

Precision grade JIS 4 for the dimensions and JIS 2 for runout

P63E

Precision P6 and air C3 / DIN standard electric motors

P6

Precision class JIS 6

P5

Precision class JIS 5

P4

Precision class JIS 4 / BAS 4 for tapered rollers

PK

Precision class K for tapered rollers, series J

PXn

Special precision with development index