Official distributor
NTN tapered roller bearings, 303 series: dimensions and part numbers
The NTN 303 series of tapered roller bearings brings together 27 part numbers in our catalogue across 22 basic sizes, from 30312 to 30348: bore (d) from 60 to 240 mm and outside diameter (D) from 130 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 dimension table
| Basic designation | d | D | T | Same size | Variants |
|---|---|---|---|---|---|
| 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 validated | Dimension not validated | ||
| 30322 | 110 | 240 | 54.5 | ||
| 30324 | 120 | 260 | 59.5 | ||
| 30326 | 130 | 280 | 63.75 | 130x280x63.75 | |
| 30328 | 140 | Dimension not validated | Dimension not validated | ||
| 30330 | 150 | Dimension not validated | Dimension not validated | ||
| 30332 | 160 | Dimension not validated | Dimension not validated | ||
| 30334 | 170 | Dimension not validated | Dimension not validated | ||
| 30336 | 180 | Dimension not validated | Dimension not validated | ||
| 30338 | 190 | Dimension not validated | Dimension not validated | ||
| 30340 | 200 | Dimension not validated | Dimension not validated | ||
| 30344 | 220 | Dimension not validated | Dimension not validated | ||
| 30348 | 240 | Dimension not validated | Dimension not validated |
Every part number in this series carries a suffix after the basic designation. The most frequent NTN suffixes, with the number of sizes they appear in: U (6), U2GB (5), UTG (5), UUTG (5), and DU7GB (3). The suffix defines the variant (sealing, cage, internal clearance or other options): 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 30312, 12 × 5 = 60 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.
Other NTN tapered roller bearings series
Which NTN 303 series bearing do you need?
Send us the full part number, or the size and the variant, with the quantity: we will quote it via WhatsApp or email.