Page 150 - Rollingbearings

B.6 Bearing interfaces
Seat tolerances • For solid steel shafts: All ISO tolerance classes used in the tables
– Radial ball bearings (table 5, except are valid with the envelope requirement
for standard insert bearings) (such as H7�), in accordance with
– Radial roller bearings (table 6, except ISO 14405­ 1. For practical reasons, symbol
conditions needle roller bearings) � is not indicated in the tables.
– Thrust ball bearings and spherical roller
thrust bearings (table 7, page 150)
The following tables provide recommenda- • For cast iron and steel housings:
tions for tolerances of shaft and housing – Radial bearings (table 8, page 151)
seats They are valid for standard applica- – Thrust bearings (table 9, page 152)
tions but do not cover all details of a speciic
application. The information under For the following bearing types, recommen-
Selecting its, page 140, and Tolerances for dations are listed in the product sections:
bearing seats and abutments, page 144,
should be additionally considered. • Insert bearings, Design considerations,
These recommendations are valid for page 356
bearings with Normal dimensional toler- • Needle roller bearings, relevant sections
ances. They can also be used for bearings to under Needle roller bearings, page 903
P6 dimensional tolerances. The tighter P6 • Cylindrical roller thrust bearings, Design
tolerance zone changes the resulting it only considerations, page 885
slightly. • Needle roller thrust bearings, Design
Recommended seat tolerances for metric considerations, page 903
bearings: • Inch tapered roller bearings, Design
considerations, page 687

Table 5
Tolerances for solid steel shafts – seats for radial ball bearings 1)

Conditions Shaft diameter Dimensional tolerance 2) Total radial run-out Total axial run-out Ra
Bearing interfaces Rotating inner ring load or direction of load indeterminate – IT4/2 – IT4 µm
tolerance 3)
tolerance 3)
–
mm

0,4
≤ 17
js5
Light loads (P ≤ 0,05 C)
j6
> 17 to 100
0,8
IT5/2
IT5
B.6 Normal to heavy loads > 100 to 140 k6 IT5/2 IT5 1,6
0,4
js5
≤ 10
IT4
IT4/2
(0,05 C < P ≤ 0,1 C)
IT4
> 10 to 17
IT4/2
0,4
j5
> 17 to 100 k5 IT4/2 IT4 0,8
> 100 to 140 m5 IT4/2 IT4 0,8
> 140 to 200 m6 IT5/2 IT5 1,6
> 200 to 500 n6 IT5/2 IT5 1,6
> 500 p7 IT6/2 IT6 3,2
Stationary inner ring load
Easy axial displacement of inner ring on shaft g6 4) IT5/2 IT5 1,6
desirable
Easy axial displacement of inner ring on shaft h6 IT5/2 IT5 1,6
unnecessary
Axial loads only j6 IT5/2 IT5 1,6
1) For insert bearings, refer to Design considerations, page 356.
2) The envelope requirement (symbol � from ISO 14405­1) is not shown but applies to all tolerance classes.
3) Values listed are for bearings to Normal tolerances. For bearings with tighter tolerance classes, use the recommendations in table 2, page 144.
4) Depending on bearing size, a shifted g6� tolerance may be needed to obtain a loose it.

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