Bearing tolerance classifications of national standards
| Standard | Applicable standerd | Tolerance Class | Bearing Types | ||||
| Japanese industrial standard (JIS) | JIS B 1514 | Class 0,6X | Class 6 | Class 5 | Class 4 | Class 2 | All type |
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International Organization for Standardization (ISO) | ISO 492 | Normal class Class 6X | Class 6 | Class 5 | Class 4 | Class 2 | Radial bearings |
| ISO 199 | Normal Class | Class 6 | Class 5 | Class 4 | ー | Thrust ball bearings | |
| ISO 578 | Class 4 | ー | Class 3 | Class 0 | Class 00 | Tapered roller bearings (Inch series) | |
| ISO 1224 | ー | ー | Class 5A | Class 4A | ー | Precision instrument bearings | |
| Deutsches Institut fur Normung(DIN) | DIN 620 | P0 | P6 | P5 | P4 | P2 | All type |
| American National Standards Institute (ANSI) American Bearing Manufacturer's Association (ABMA) | 1 ANSI/ABMA Std.20 | ABEC-1 RBEC-1 | ABEC-3 RBEC-3 | ABEC-5 RBEC-5 | ABEC-7 | ABEC-9 | Radial bearings (Except tapered roller bearings) |
| ANSI/ABMA Std.19.1 | Class K | Class N | Class C | Class B | Class A | Tapered roller bearings (Metric series) | |
| ANSI/ABMA Std.19 | Class 4 | Class 2 | Class 3 | Class 0 | Class 00 | Tapered roller bearings (Inch series) | |
