Bearing accuracy refers to dimensional accuracy and rotation accuracy. The accuracy grade of goot bearing is divided into: P0, P6, P5, P4, which are equivalent to ISO standard. The comparison of different standard accuracy levels is as follows:
Accuracy level comparison:
Standard code

Accuracy class

GB 
P0 
P6 
P5 
P4 
ISO 
NORMAL CLASS 
CLASS6 
CLASS 
CLASS4 
SKF 
P0 
P6 
P5 
P4 
DIN 
P0 
P6 
P5 
P4 
JIS 
P0 
P6 
P5 
P4 
ANSI 
ABEC1 
ABEC3 
ABEC5 
ABEC7 
Radial bearing tolerance (inner ring)
Accuracy class Accuracy class

D mm From To 
△ dmp 
V dsp 
Vdmp 
Kia 
Sd 
Sia 
△ Bs 
VBs max 
Upper deviation Upper deviation 
Lower deviation Lower deviation 
nine 
zero point one 
2.3.4 
Upper deviation Upper deviation 
Lower deviation Lower deviation 
max 
max 
max 
max 
max 
max 
max 
P0 
zero point six 
two point five 
zero 
8 
ten 
eight 
six 
six 
ten 
/ 
twenty 
zero 
40 
twelve 
two point five 
ten 
zero 
8 
ten 
eight 
six 
six 
ten 
/ 
twenty 
zero 
120 
fifteen 
ten 
eighteen 
zero 
8 
ten 
eight 
six 
six 
ten 
/ 
twenty 
zero 
120 
twenty 
eighteen 
thirty 
zero 
10 
thirteen 
ten 
eight 
eight 
thirteen 
/ 
twentyfour 
zero 
120 
twenty 
thirty 
fifty 
zero 
12 
fifteen 
twelve 
nine 
nine 
fifteen 
/ 
twentyfour 
zero 
120 
twenty 
P6 
zero point six 
two point five 
zero 
7 
nine 
seven 
five 
five 
five 
/ 
ten 
zero 
40 
twelve 
two point five 
ten 
zero 
7 
nine 
seven 
five 
five 
six 
/ 
ten 
zero 
120 
fifteen 
ten 
eighteen 
zero 
7 
nine 
seven 
five 
five 
seven 
/ 
twelve 
zero 
120 
twenty 
eighteen 
thirty 
zero 
8 
ten 
eight 
six 
six 
eight 
/ 
twelve 
zero 
120 
twenty 
thirty 
fifty 
zero 
10 
thirteen 
ten 
eight 
eight 
ten 
/ 
twelve 
zero 
120 
twenty 
P5 
zero point six 
two point five 
zero 
5 
five 
four 
four 
three 
four 
seven 
seven 
zero 
40 
five 
two point five 
ten 
zero 
5 
five 
four 
four 
three 
four 
seven 
seven 
zero 
40 
five 
ten 
eighteen 
zero 
5 
five 
four 
four 
three 
four 
seven 
seven 
zero 
80 
five 
eighteen 
thirty 
zero 
6 
six 
five 
five 
three 
four 
eight 
eight 
zero 
120 
five 
thirty 
fifty 
zero 
8 
eight 
six 
six 
four 
five 
eight 
eight 
zero 
120 
five 
P4 
zero point six 
two point five 
zero 
4 
four 
three 
three 
two 
two point five 
three 
three 
zero 
40 
two point five 
two point five 
ten 
zero 
4 
four 
three 
three 
two 
two point five 
three 
three 
zero 
40 
two point five 
ten 
eighteen 
zero 
4 
four 
three 
three 
two 
two point five 
three 
three 
zero 
80 
two point five 
eighteen 
thirty 
zero 
5 
five 
four 
four 
two point five 
three 
four 
four 
zero 
120 
two point five 
thirty 
fifty 
zero 
6 
six 
five 
five 
three 
four 
four 
four 
zero 
120 
three 
Radial bearing tolerance (outer ring)
Accuracy class Accuracy class

D mm From To 
△ dmp 
V DSP diameter series 
Vdmp 
Kea 
Sea 
Sd 
△ Cs 
VCs max 
Upper deviation Upper deviation 
Lower deviation Lower deviation 
Open bearing 
Closed bearing 
Upper deviation Upper deviation 
Lower deviation Lower deviation 
nine 
zero point one 
2.3.4 
2.3.4 
max 
max 
max 
max 
P0 
two point five 
six 
zero 
8 
ten 
eight 
six 
ten 
six 
fifteen 
/ 
/ 
zero 
40 
twelve 
six 
eighteen 
zero 
8 
ten 
eight 
six 
ten 
six 
fifteen 
/ 
/ 
zero 
120 
fifteen 
eighteen 
thirty 
zero 
9 
twelve 
nine 
seven 
twelve 
seven 
fifteen 
/ 
/ 
zero 
120 
twenty 
thirty 
fifty 
zero 
11 
fourteen 
eleven 
eight 
sixteen 
eight 
twenty 
/ 
/ 
zero 
120 
twenty 
P6 
two point five 
six 
zero 
7 
nine 
seven 
five 
nine 
five 
eight 
/ 
/ 
zero 
40 
twelve 
six 
eighteen 
zero 
7 
nine 
seven 
five 
nine 
five 
eight 
/ 
/ 
zero 
120 
fifteen 
eighteen 
thirty 
zero 
8 
ten 
eight 
six 
ten 
six 
nine 
/ 
/ 
zero 
120 
twenty 
thirty 
fifty 
zero 
9 
eleven 
nine 
seven 
thirteen 
seven 
ten 
/ 
/ 
zero 
120 
twenty 
P5 
two point five 
six 
zero 
5 
five 
four 
four 
/ 
three 
five 
eight 
eight 
zero 
40 
five 
six 
eighteen 
zero 
5 
five 
four 
four 
/ 
three 
five 
eight 
eight 
zero 
40 
five 
eighteen 
thirty 
zero 
6 
six 
five 
five 
/ 
three 
six 
eight 
eight 
zero 
80 
five 
thirty 
fifty 
zero 
7 
seven 
five 
five 
/ 
four 
seven 
eight 
eight 
zero 
120 
five 
P4 
two point five 
six 
zero 
4 
four 
three 
three 
three 
two 
three 
five 
four 
zero 
40 
two point five 
six 
eighteen 
zero 
4 
four 
three 
three 
three 
two 
three 
five 
four 
zero 
40 
two point five 
eighteen 
thirty 
zero 
5 
five 
four 
four 
four 
two point five 
four 
five 
four 
zero 
80 
two point five 
thirty 
fifty 
zero 
6 
six 
five 
five 
five 
three 
five 
five 
four 
zero 
120 
two point five 