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FAG tapered roller bearings, 331 series: dimensions and part numbers
The FAG 331 series of tapered roller bearings brings together 16 part numbers in our catalogue across 16 basic sizes, from 33108 to 33124: bore (d) from 40 to 120 mm and outside diameter (D) from 75 to 180 mm. Every part number in the table links to its own page, where you can request a quote via WhatsApp or email.
331 series dimension table
| Basic designation | d | D | T | Same size | Variants |
|---|---|---|---|---|---|
| 33108 | 40 | 75 | 26 | ||
| 33109 | 45 | 80 | 26 | ||
| 33110 | 50 | 85 | 26 | ||
| 33111 | 55 | 95 | 30 | ||
| 33112 | 60 | 100 | 30 | ||
| 33113 | 65 | 110 | 34 | ||
| 33114 | 70 | 120 | 37 | 70x120x37 | |
| 33115 | 75 | 125 | 37 | 75x125x37 | |
| 33116 | 80 | 130 | 37 | 80x130x37 | |
| 33117 | 85 | 140 | 41 | 85x140x41 | |
| 33118 | 90 | 150 | 45 | 90x150x45 | |
| 33119 | 95 | Dimension not validated | Dimension not validated | ||
| 33120 | 100 | Dimension not validated | Dimension not validated | ||
| 33121 | 105 | Dimension not validated | Dimension not validated | ||
| 33122 | 110 | 180 | 56 | 110x180x56 | |
| 33124 | 120 | Dimension not validated | Dimension not validated |
In 9 of the 16 sizes the basic designation is also listed on its own, without a suffix. The most frequent FAG suffixes, with the number of sizes they appear in: XL (7). 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: 331 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 33108, 08 × 5 = 40 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 FAG tapered roller bearings series
Which FAG 331 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.