The cages for NSK angular contact ball bearings with a contact cngle of 30° (Symbol A) or 40° (Symbol B) are in accordance with table as below, but depending on the application, machined synthetic resin cages or molded polyamide resin cages are also used. The basic load ratings given in the NSK bearing tables are based on the cages classification listed in table.
Standard cages for NSK angular contact ball bearings
| Series | Pressed steel cages | Machined Brass cages |
|---|---|---|
| 79A5, C | - | 7900-7940 |
| 70A | 7000-7018 | 7019-7040 |
| 70C | - | 7000-7022 |
| 72A, B | 7200-7222 | 7224-7240 |
| 72C | - | 7200-7240 |
| 73A, B | 7300-7320 | 7321-7340 |
In addition, for NSK bearings with the same serial number, if the type of cages are different, the number of balls may also be different. In such a case, the load rating will differ from the one listed in the NSK bearing size chart.
