plaquette MACHLINE - Ntn-snr.com

Tolerances and precision classes
Bearing seat tolerances
In order not to alter preloading or damage rotational
accuracy, seats must be very close to bearing
dimensions. In general, we recommend the fits
specified below. When installing the bearings, we
advise matching them with their seats to avoid
assembling parts at the extremes of their tolerance
limits, which can only lead to excessive clearance
or tight fit.
Tolerances in microns
Shaft
Housing
Nominal ISO4 ISO2 ISO4 ISO2
diameter Fixed Floating Fixed Floating
(mm) assembly assembly assembly assembly
h4 (1) js4(2) - JS5(1) K5(2) H5(3) Play (4) JS4 -
10 to 18
> 18 to 30
> 30 to 50
> 50 to 80
> 80 to 120
> 120 to 180
> 180 to 250
> 250 to 315
> 315 to 400
0 +3 0 - - - - - -
-5 -3 -4 - - - - - -
0 +3 0 +4 +1 +9 +3 +8
2 to 10
-6 -3 -4 -4 -8 0
-3 +2
0 +4 0 +5 +2 +11 +4 +10
3 to 11
-7 -4 -5 -5 -9 0
-4 +2
0 +4 0 +6 +3 +13 +4 +11
3 to 12
-8 -4 -5 -6 -10 0
-4 +3
0 +5 0 +7 +2 +15 +5 +13
5 to 15
-10 -5 -6 -7 -13 0
-5 +3
0 +6 0 +9 +3 +18 +6 +16
5 to 17
-12 -6 -8 -9 -15 0
-6 +4
0 +7 0 +10 +2 +20 +7 +18
7 to 22
-14 -7 -10 -10 -18 0
-7 +4
- - - +11 +3 +23 +8 +21
- - - -11 -20 0
7 to 27
-8 +5
- - - +12 +3 +25 +9 +23
7 to 30
- - - -12 -22 0
-9 +5
(1) Light load C/P > 16, Medium load 10 ≤ C/P 16
(2) Heavy load C/P < 10 or high speed applications (ML range)
(3) We recommend a tolerance, but the optimum fitting is obtained by matching the housing and bearings within the tolerance limits specified in column (4)
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