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RKB tapered roller bearings, 303 series: dimensions and part numbers
The RKB 303 series of tapered roller bearings brings together 27 part numbers in our catalogue across 27 basic sizes, from 30302 to 30334: bore (d) from 15 to 170 mm and outside diameter (D) from 42 to 280 mm. Every part number in the table links to its own page, where you can request a quote via WhatsApp or email.
303 series size chart
| Basic designation | d | D | T | Same size | Variants |
|---|---|---|---|---|---|
| 30302 | 15 | 42 | 14.25 | ||
| 30303 | 17 | 47 | 15.25 | ||
| 30304 | 20 | 52 | 16.25 | ||
| 30305 | 25 | 62 | 18.25 | 25x62x18.25 | |
| 30306 | 30 | 72 | 20.75 | 30x72x20.75 | |
| 30307 | 35 | 80 | 22.75 | 35x80x22.75 | |
| 30308 | 40 | 90 | 25.25 | 40x90x25.25 | |
| 30309 | 45 | 100 | 27.25 | 45x100x27.25 | |
| 30310 | 50 | 110 | 29.25 | 50x110x29.25 | |
| 30311 | 55 | 120 | 31.5 | 55x120x31.5 | |
| 30312 | 60 | 130 | 33.5 | 60x130x33.5 | |
| 30313 | 65 | 140 | 36 | 65x140x36 | |
| 30314 | 70 | 150 | 38 | 70x150x38 | |
| 30315 | 75 | 160 | 40 | 75x160x40 | |
| 30316 | 80 | 170 | 42.5 | 80x170x42.5 | |
| 30317 | 85 | 180 | 44.5 | 85x180x44.5 | |
| 30318 | 90 | 190 | 46.5 | 90x190x46.5 | |
| 30319 | 95 | 200 | 49.5 | 95x200x49.5 | |
| 30320 | 100 | 215 | 51.5 | ||
| 30321 | 105 | Dimension not yet confirmed | Dimension not yet confirmed | ||
| 30322 | 110 | 240 | 54.5 | ||
| 30324 | 120 | 260 | 59.5 | ||
| 30326 | 130 | 280 | 63.75 | 130x280x63.75 | |
| 30328 | 140 | Dimension not yet confirmed | Dimension not yet confirmed | ||
| 30330 | 150 | Dimension not yet confirmed | Dimension not yet confirmed | ||
| 30332 | 160 | Dimension not yet confirmed | Dimension not yet confirmed | ||
| 30334 | 170 | Dimension not yet confirmed | Dimension not yet confirmed |
In 27 of the 27 sizes the basic designation is also listed on its own, without a suffix. To request a quote, send us the full part number marked on the bearing, the box or the drawing.
How to read the part number: 303 gives the bearing type and the dimension series; for the same bore, each series has a different outside diameter and width. What follows is the bore code: from 04 upwards, multiplying by 5 gives the bore in millimetres (in the 30306, 06 × 5 = 30 mm); 00, 01, 02 and 03 stand for 10, 12, 15 and 17 mm.
The table gives the boundary dimensions of each basic designation according to ISO 355, in millimetres: d is the bore, D the outside diameter and T the total width. These are standardised dimensions: the same basic designation has the same dimensions in every brand. Where a dash appears, the dimension has not been validated yet: we confirm it when we quote.
If the part number on the bearing can no longer be read, measure the bore, the outside diameter and the total width, and find the matching row: with that size and the variant you need, we will quote it.
More RKB tapered roller bearings series
Need a bearing from the RKB 303 series?
Tell us the complete part number, or the size and variant, plus the quantity, and we'll send a quote by WhatsApp or email.