TOLERANCE

Bearing tolerances include dimensional tolerance and rotary tolerance or dimensional 

accuracy and running accuracy , are regulated by ISO or JIS standards (rolling bearing tolerances)

For dimensional accuracy, these standards prescribe the tolerances necessary when 

Installing bearings on shafts or in housings. Running accuracy is defined as the allowable 

Limits for bearing run-out during operation.














According to dimension tolerances and run out accuracy, UGT deep groove ball bearing are 

Ranged from ABEC-1 to ABEC-7. ABEC-1 is standard grade.
















Comparison of tolerance classifications of national standards












Standard

Applicable standard

 

 


Tolerance class

 

ANSI

ANSI/ABMA Std.20

 

ABEC-1

ABEC-3

ABEC-5

ABEC-7

ABEC-9

JIS


JIS B 1514

 

Class0,6X

Class 6

Class 5

Class 4

Class 2

ISO


ISO 492

 

Class0,6X

Class 6

Class 5

Class 4

Class 2

DIN


DIN 620

 

P0

P6

P5

P4

P2