Page 154 - Rollingbearings

B.6 Bearing interfaces
Table 9
Tolerances for cast iron and steel housings – seats for thrust bearings 1)
Conditions Dimensional Total axial run-out Ra Remarks
tolerance 2) tolerance
– – µm –

Axial loads only
Thrust ball bearings H8 IT7 6,3 For less precise bearing arrangements, there
can be a radial clearance of up to 0,001 D.
Spherical roller thrust bearings where – IT6 Housing washer must be itted with an ade-
separate bearings provide radial location quate radial gap so that no radial load can act
on the thrust bearings.
Combined radial and axial loads on
spherical roller thrust bearings
Stationary load on housing washer H7 IT6 3,2 3) For additional information, refer to Design
arrangements considerations, page 918.
Rotating load on housing washer
M7 IT6 3,2 3)

1) For cylindrical roller thrust bearings, refer to Design considerations, page 885. For needle roller thrust bearings, refer to Design considerations, page 903.
2) The envelope requirement (symbol � from ISO 14405­1) is not shown but applies to all tolerance classes.
3) For D < 80 mm, use Ra = 1,6 µm.
Bearing interfaces Tolerances for seats of bearings mounted on tapered sleeves Total radial Table 10

Diameter tolerance
Shaft diameter
run-out
d
Nominal
max.
> ≤ h9� L IT5/2
U
B.6 mm µm mm
10 18 0 –43 4
18 30 0 –52 5
30 50 0 –62 6
50 80 0 –74 7
80 120 0 –87 8
120 180 0 –100 9

180 250 0 –115 10
250 315 0 –130 12
315 400 0 –140 13
400 500 0 –155 14
500 630 0 –175 16
630 800 0 –200 18
800 1 000 0 –230 20
1 000 1 250 0 –260 24

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