Tolerance Class

 

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

radial.jpg

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

Δdmp
Vdp
Vdmp
Kia
ΔBs
VBs

Table IB

Tolerance Class ABEC-1, RBEC-1
(ISO Class Normal)
Outer Ring

Unit μm

ΔDmp
VDp
VDmp
Kea
ΔCs
VCs

                      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