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  • Accuracy

    There are stipulations to the roller bearing major size allowable tolerance, admittance value, rotating precision in the National Standard of GB3.7.1. the following is a comparison table between these admissions and ISO, JIS Standards:

    Standard allowable tolerance grades
    GB\T307.1
    PO
    P6
    P5
    P4
    P2
    ISO 492
    Normal Class
    Class6
    Class5
    Class4
    Class2
    JIS B 1514
    JIS 0 Grade
    JIS 6 Grade
    JIS 5 Grade
    JIS 4 Grade
    JIS 2 Grade
    AFBMA STD.20
    ABEC 1
    ABEC 3
    ABEC 5
    ABEC7
    ABEC9


    TOLERANCE CLASS ABEC-1

    INNER RING Tolerance in um
    d
    ^dmp
    Vdp2)
    Vdmp
    Kia
    ^Bs
    VBs
    Diameter Series
    mm
    9
    0,1
    2,3,4
    over
    incl.
    high
    low
    max.
    max.
    max.
    high
    low
    max.
    1)0.6
    2.5
    0
    -8
    10
    8
    6
    6
    10
    0
    -40
    12
    2.5
    10
    0
    -8
    10
    8
    6
    6
    10
    0
    -120
    15
    10
    18
    0
    -8
    10
    8
    6
    6
    10
    0
    -120
    20
    18
    30
    0
    -10
    13
    10
    8
    8
    13
    0
    -120
    20
    30
    50
    0
    -12
    15
    12
    9
    9
    15
    0
    -120
    20
    50
    80
    0
    -15
    19
    19
    11
    11
    20
    0
    -150
    25
    1)0.6 is included.
    2)No value for diameter series 7,8.
    OUTER RING Tolerance in um
    D
    ^Dmp
    VDp2)4)
    VDmp4)
    Kea
    ^Cs
    VCs
    Open Bearings
    Capped Bearings2)3)
    mm
    Diameter Series
    9
    0,1
    2,3,4
    2,3,4
    over
    incl.
    high
    low
    max.
    max.
    max.
    high
    low
    max.
    1)2.5
    6
    0
    -8
    10
    8
    6
    10
    6
    15
    Identical to
    ^Bs and VBs
    of inner ring of
    same bearing
    6
    18
    0
    -8
    10
    8
    6
    10
    6
    15
    18
    30
    0
    -9
    12
    9
    7
    12
    7
    15
    30
    50
    0
    -11
    14
    11
    8
    16
    8
    20
    50
    80
    0
    -13
    16
    13
    10
    20
    10
    25
    80
    120
    0
    -15
    19
    19
    11
    26
    11
    35
    120
    150
    0
    -18
    23
    23
    14
    30
    14
    40
    1)2.5 is included.
    3)No values for diameter seriers9,0,1.
    2)No values for diameter series 7,8.
    4)Fit for before assembling and after disestablish of snap rings.

    ABEC STANDARD BEARING TOLERANCES FOR INCH-DIMENSION BALL BEARINGS
    (See corresponding metric grouping)

    Inch
    MM
    Over
    Incl.
    Over
    Incl.
    0.0984
    0.2362
    2.5
    6
    0.2362
    0.3937
    6
    10
    0.3937
    0.7087
    10
    18
    0.7087
    1.1811
    18
    30
    1.1811
    1.9685
    30
    50
    1.9685
    3.1496
    50
    80
    3.1496
    4.7244
    80
    120







     

     

    TOLERANCE CLASS ABEC-3

    INNER RING Tolerance in um
    d
    ^dmp
    Vdp2)
    Vdmp
    Kia
    ^Bs
    VBs
    Diameter Series
    mm
    9
    0,1
    2,3,4
    over
    incl.
    high
    low
    max
    max.
    max.
    high
    low
    max.
    1)0.6
    2.5
    0
    -7
    9
    7
    5
    5
    5
    0
    -40
    12
    2.5
    10
    0
    -7
    9
    7
    5
    5
    6
    0
    -120
    15
    10
    18
    0
    -7
    9
    7
    5
    5
    7
    0
    -120
    20
    18
    30
    0
    -8
    10
    8
    6
    6
    8
    0
    -120
    20
    30
    50
    0
    -10
    13
    10
    8
    8
    10
    0
    -120
    20
    50
    80
    0
    -12
    15
    15
    9
    9
    10
    0
    -150
    25
    1)0.6 is included.
    2)No values for diameter series 7,8
    OUTER RING Tolerance in um
    D
    ^Dmp
    VDp2)4)
    VDmp4)
    Kea
    ^Cs
    VCs
    Open
    Bearings
    Capped Bearings3)
    mm
    Diameter Series
    9
    0,1
    2,3,4
    0,1,2,3,4
    over
    incl.
    high
    low
    max
    max.
    max.
    high
    low
    max.
    1)2.5
    6
    0
    -7
    9
    7
    5
    9
    5
    8
    Identical to^Bs and VBsof inner ring ofsame bearing
    6
    18
    0
    -7
    9
    7
    5
    9
    5
    8
    18
    30
    0
    -8
    10
    8
    6
    10
    6
    9
    30
    50
    0
    -9
    11
    9
    7
    13
    7
    10
    50
    80
    0
    -11
    14
    11
    8
    16
    8
    13
    80
    120
    0
    -13
    16
    16
    10
    20
    10
    18
    120
    150
    0
    -15
    19
    19
    11
    25
    11
    20
    1) 2.5 is included.
    2) No values for diameter series 7,8
    3) No values for diameter series 9.
    4) Fit for before assembling and after disestablish of snap rings.

    over