Bearing specifics
Tolerances SKF super-precision bearings are manufactured to tolerance classes similar to inter nationally standardized tolerance classes. Standards for rolling bearing tolerances are:
1
• ISO 492 for radial rolling bearings • ISO 199 for thrust rolling bearings For available bearing types and tolerance classes, refer to Precision († page 24). Actual tolerance values are listed under Toler ances in each product chapter. Tolerance symbols The tolerance symbols and their definitions are provided in table 4 († page 48). Chamfer dimension limits The maximum chamfer limits († fig. 7) for the relevant minimum chamfer dimensions († product tables) are listed in table 5 († page 50). The values are in accordance with ISO 582. Double direction angular contact thrust ball bearings in the BTM and BTW series and single direction angular contact thrust ball bearings for screw drives in the BSA series have the same maximum chamfer dimensions as radial bearings.
Fig. 7
r1 max r3 max
Fig. 6
r1 min r3 min
r1, r3
r2 , r4
r2 max r4 max
r2 min r4 min
47