Page 30 - needle bearings

Bearing Accuracy
NTN

Table 4.3 Tolerances for radial bearings
Table 4.3(1) Inner rings

Nominal bore Dimensional tolerance for mean bore diameter Variation of mean Allowable variation of
diameter ∆dmp bore diameter bore diameter
ɹd Vdp Vdmp
mm
Class Class Class Class Class Class Class Class
Class 0 Class 6 Class 5 Class 4
0 6 5 4 0 6 5 4
over incl. high low high low high low high low max max
2.5 1 10 0 ʵ8 0 ʵ7 0 ʵ5 0 ʵ4 10 9 5 4 6 5 3 2
10 18 0 ʵ8 0 ʵ7 0 ʵ5 0 ʵ4 10 9 5 4 6 5 3 2
18 30 0 ʵ10 0 ʵ8 0 ʵ6 0 ʵ5 13 10 6 5 8 6 3 2.5
30 50 0 ʵ12 0 ʵ10 0 ʵ8 0 ʵ6 15 13 8 6 9 8 4 3
50 80 0 ʵ15 0 ʵ12 0 ʵ9 0 ʵ7 19 15 9 7 11 9 5 3.5
80 120 0 ʵ20 0 ʵ15 0 ʵ10 0 ʵ8 25 19 10 8 15 11 5 4
120 150 0 ʵ25 0 ʵ18 0 ʵ13 0 ʵ10 31 23 13 10 19 14 7 5
150 180 0 ʵ25 0 ʵ18 0 ʵ13 0 ʵ10 31 23 13 10 19 14 7 5
180 250 0 ʵ30 0 ʵ22 0 ʵ15 0 ʵ12 38 28 15 12 23 17 8 6
250 315 0 ʵ35 0 ʵ25 0 ʵ18 ʔ ʔ 44 31 18 ʔ 26 19 9 ʔ
315 400 0 ʵ40 0 ʵ30 0 ʵ23 ʔ ʔ 50 38 23 ʔ 30 23 12 ʔ
400 500 0 ʵ45 0 ʵ35 ʔ ʔ ʔ ʔ 56 44 ʔ ʔ 34 26 ʔ ʔ
1 2.5mm is included in this dimensional category.
2 This table is applied to the ball bearings.

Table 4.3 (2) Outer rings

Nominal outer Dimensional tolerance for mean outer diameter Allowable variation of Allowable variation of
diameter outer diameter mean outer diameter
∆Dmp
D VDp VDmp
mm
Class Class Class Class Class Class Class Class
Class 0 Class 6 Class 5 Class 4 0 6 5 4 0 6 5 4
over incl. high low high low high low high low max. max.
6 3 18 0 ʵ8 0 ʵ7 0 ʵ5 0 ʵ4 10 9 5 4 6 5 3 2
18 30 0 ʵ9 0 ʵ8 0 ʵ6 0 ʵ5 12 10 6 5 7 6 3 2.5
30 50 0 ʵ11 0 ʵ9 0 ʵ7 0 ʵ6 14 11 7 6 8 7 4 3
50 80 0 ʵ13 0 ʵ11 0 ʵ9 0 ʵ7 16 14 9 7 10 8 5 3.5
80 120 0 ʵ15 0 ʵ13 0 ʵ10 0 ʵ8 19 16 10 8 11 10 5 4
120 150 0 ʵ18 0 ʵ15 0 ʵ11 0 ʵ9 23 19 11 9 14 11 6 5
150 180 0 ʵ25 0 ʵ18 0 ʵ13 0 ʵ10 31 23 13 10 19 14 7 5
180 250 0 ʵ30 0 ʵ20 0 ʵ15 0 ʵ11 38 25 15 11 23 15 8 6
250 315 0 ʵ35 0 ʵ25 0 ʵ18 0 ʵ13 44 31 18 13 26 19 9 7
315 400 0 ʵ40 0 ʵ28 0 ʵ20 0 ʵ15 50 35 20 15 30 21 10 8
400 500 0 ʵ45 0 ʵ33 0 ʵ23 ʔ ʔ 56 41 23 ʔ 34 25 12 ʔ
500 630 0 ʵ50 0 ʵ38 0 ʵ28 ʔ ʔ 63 48 28 ʔ 38 29 14 ʔ
1 6mm is included in this dimensional category.
2 This table is applied to the ball bearings.

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