Four-point angular contact ball bearings feature a special dual-half-inner-ring design, enabling them to withstand radial loads and bidirectional axial loads, with a single bearing set providing bidirectional positioning. They have a compact footprint and are easier to install than two sets of single-row angular contact bearings. They offer good maximum rotational speeds but lack self-aligning capability. They are commonly used in gearboxes, screw compressors, slewing rings, pumps and valves, and other applications where bidirectional axial loads must be supported and installation space is limited.
| Bearing model number | Basic Dimensions（mm） | Basic load （KN） |
Rated speed(rpm) | Bearing weight | ||||
|---|---|---|---|---|---|---|---|---|
| d inner diameter |
D outer diameter |
B thickness |
Dynamic load Cr |
Static load Cor |
Grease lubrication | Oil lubrication | ||
| QJF2952 | 260 | 360 | 60 | 182 | 330 | 890 | 1200 | 17.8 |
| QJF1048 | 240 | 360 | 56 | 300 | 580 | 1000 | 1300 | 21 |
| QJ1048 | 240 | 360 | 56 | 300 | 580 | 1000 | 1300 | 21 |
| QJF3948X1 | 240 | 329.5 | 60 | 245 | 320 | 800 | 1300 | 20 |
| QJ3948X1 | 240 | 329.5 | 60 | 245 | 320 | 800 | 1300 | 20 |
| QJF1044 | 220 | 340 | 56 | 250 | 440 | 1000 | 1400 | 18 |
| QJ1044 | 220 | 340 | 56 | 250 | 440 | 1000 | 1400 | 18 |
| QJF3944X1 | 220 | 309.5 | 60 | 219 | 334 | 800 | 1300 | 18 |
| QJF3944 | 220 | 300 | 60 | 219 | 334 | 800 | 1300 | 13.1 |
| QJ3944 | 220 | 300 | 60 | 219 | 334 | 800 | 1300 | 13.1 |
| QJF240 | 200 | 360 | 58 | 375 | 614 | 900 | 1400 | 27.2 |
| QJ240 | 200 | 360 | 58 | 375 | 614 | 900 | 1400 | 27.2 |
| QJF1040 | 200 | 310 | 51 | 240 | 400 | 1100 | 1600 | 15 |
| QJ1040 | 200 | 310 | 51 | 240 | 400 | 1100 | 1600 | 15 |
| QJF3940X3 | 200 | 289.5 | 58 | 280 | 435 | 1000 | 1500 | 13.3 |
| QJ3940X3 | 200 | 289.5 | 58 | 280 | 435 | 1000 | 1500 | 13.3 |
| QJF238 | 190 | 340 | 55 | 363 | 578 | 900 | 1400 | 22.9 |
| QJ238 | 190 | 340 | 55 | 363 | 578 | 900 | 1400 | 22.9 |
| QJF1038 | 190 | 290 | 46 | 220 | 360 | 1200 | 1700 | 11.5 |
| QJ1038 | 190 | 290 | 46 | 220 | 360 | 1200 | 1700 | 11.5 |
