BBL® BEARINGS
PROFESSIONAL IN : BEARINGS & SLIDING ROLLERS & HARDWARE
The dimensional and geometrical tolerances of bearings are described by their tolerance classes . BBL is producing the Normal P0 & P6 tolerance classes.
COMPARISON OF TOLERANCE CLASS
Radial Clearance Standard

The radial play/clearance is determined by the actual raceway diameters and ball diameter. Generally, internal radial play will be reduced 80% of the interference fit amount.
Unit μm
Boundary dimensions and running accuracy
Table IA
Tolerance Class ABEC-1, RBEC-1
(ISO Class Normal)
Inner Ring
Unit μm
Table IB
Tolerance Class ABEC-1, RBEC-1
(ISO Class Normal)
Outer Ring
Unit μm
Symbols for boundary dimensions and running accuracy
Inner ring:
d = Nominal bore diameter
Δdmp = Single plane mean bore diameter deviation
Vdp = Single radial plane bore diameter variation
Vdmp = Mean single plane bore diameter variation
Kia = Inner ring radial runout
Sd = Face runout with bore
Sia = Inner ring axial runout (with side)
ΔBs = Inner ring width deviation
VBs = Inner ring width varietion
Outer ring:
D = Nominal outside diameter
ΔDmp = Single plane mean outside diameter deviation
VDp = Single radial plane outside diameter variation
VDmp = Mean single plane outside diameter variation
Kea = Outer ring radial runout
SD = Outside surface inclination
Sea = Outside ring axial runout
ΔCs = Outer ring width deviation
VCs = Outer ring width variation