Official distributor
NTN deep groove ball bearings, 63 series: dimensions and part numbers
The NTN 63 series of deep groove ball bearings brings together 45 part numbers in our catalogue across 16 basic sizes, from 6308 to 6334: bore (d) from 40 to 170 mm and outside diameter (D) from 90 to 360 mm. Every part number in the table links to its own page, where you can request a quote via WhatsApp or email.
63 series dimension table
| Basic designation | d | D | B | Same size | Variants |
|---|---|---|---|---|---|
| 6308 | 40 | 90 | 23 | 40x90x23 | |
| 6309 | 45 | 100 | 25 | 45x100x25 | |
| 6310 | 50 | 110 | 27 | 50x110x27 | |
| 6311 | 55 | 120 | 29 | 55x120x29 | |
| 6312 | 60 | 130 | 31 | 60x130x31 | |
| 6318 | 90 | 190 | 43 | 90x190x43 | |
| 6319 | 95 | 200 | 45 | 95x200x45 | |
| 6320 | 100 | 215 | 47 | 100x215x47 | |
| 6321 | 105 | 225 | 49 | 105x225x49 | |
| 6322 | 110 | 240 | 50 | 110x240x50 | |
| 6324 | 120 | 260 | 55 | 120x260x55 | |
| 6326 | 130 | 280 | 58 | 130x280x58 | |
| 6328 | 140 | 300 | 62 | 140x300x62 | |
| 6330 | 150 | 320 | 65 | 150x320x65 | |
| 6332 | 160 | 340 | 68 | 160x340x68 | |
| 6334 | 170 | 360 | 72 | 170x360x72 |
In 16 of the 16 sizes the basic designation is also listed on its own, without a suffix. The most frequent NTN suffixes, with the number of sizes they appear in: ZZ (10), LLB (5), LLU (5), LLH (3), and MALLB (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: 63 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 6308, 08 × 5 = 40 mm).
The table gives the boundary dimensions of each basic designation according to ISO 15, in millimetres: d is the bore, D the outside diameter and B the width. These are standardised dimensions: the same basic designation has the same dimensions in every brand.
If the part number on the bearing can no longer be read, measure the bore, the outside diameter and the width, and find the matching row: with that size and the variant you need, we will quote it.
Other NTN deep groove ball bearings series
Which NTN 63 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.