The 303 series comprises metric single-row tapered roller bearings with a large contact angle, offering superior radial and axial load-carrying capacity and capable of withstanding radial and unidirectional axial combined loads. They generally feature stamped steel cages and offer excellent interchangeability across standard sizes. When mounted in pairs in opposite directions, they can withstand bidirectional axial loads and are suitable for medium- to heavy-load applications such as automotive chassis, heavy-duty gearboxes, construction machinery and mining equipment.
| Bearing model number | Basic Dimensions（mm） | Basic load （KN） |
Bearing weight | |||
|---|---|---|---|---|---|---|
| d inner diameter |
D outer diameter |
B thickness |
dynamic load Cr |
static load Cor |
||
| 30352 | 260 | 540 | 114 | 108 | ||
| 30348 | 240 | 500 | 105 | 88.9 | ||
| 30344 | 220 | 460 | 80 | 1260 | 1680 | 69 |
| 30340 | 200 | 420 | 89 | 1120 | 1450 | 53.5 |
| 30338 | 190 | 400 | 86 | 1010 | 1250 | 46.2 |
| 30336 | 180 | 380 | 83 | 901 | 1110 | 39.3 |
| 30334 | 170 | 360 | 80 | 995 | 1370 | 35.6 |
| 30332 | 160 | 340 | 75 | 913 | 1190 | 29.5 |
| 30330 | 150 | 320 | 72 | 802 | 1090 | 25.4 |
| 30328 | 140 | 300 | 67.75 | 722 | 975 | 20.4 |
| 30326 | 130 | 280 | 63.75 | 640 | 855 | 16.9 |
| 30324 | 120 | 260 | 59.5 | 505 | 611 | 13.7 |
| 30322 | 110 | 240 | 54.5 | 407 | 475 | 11.4 |
| 30321 | 105 | 225 | 53.5 | 371 | 432 | 8.74 |
| 30320 | 100 | 215 | 51.5 | 335 | 380 | 7.72 |
| 30319 | 95 | 200 | 49.5 | 315 | 365 | 6.58 |
| 30318 | 90 | 190 | 46.5 | 335 | 405 | 6.3 |
| 30317 | 85 | 180 | 44.5 | 305 | 365 | 5.2 |
| 30316 | 80 | 170 | 42.5 | 291 | 350 | 4.41 |
| 30315 | 75 | 160 | 40 | 255 | 305 | 3.57 |
