Bearing Tolerances
Tolerance classes and the corresponding values for radial bearings is specified in ISO 492 & DIN 620-2. Tolerance classes and the corresponding values for thrust bearings is specified in ISO 199 & DIN 620-3.
Mainly there are three common classes for Ball Bearings and Roller Bearings
Tolerance Class | Description |
Normal | Minimum standard for HBT’s Ball Bearings and Roller Bearings. |
Class 6 | Tighter Tolerance than Normal |
Class 5 | Tighter Tolerance than Class 6 |
Bearing Tolerances Symbols and Definations
Symbols | Definations |
d | Nominal bore diameter |
Δdmp | Deviation of mean bore diameter in a single plane. |
Δd1mp | Deviation of mean large end diameter in tapered bore. |
VDsp | Variation of a single bore diameter in a single plane |
VDmp | Variation of a mean bore diameter |
D | Nominal Outside Diameter |
ΔDmp | Deviation of mean outside diameter in a single plane |
VDsp | Variation of a single outside diameter in a single plane |