33110-NTN bearing: complete specifications & equivalents
The 33110-NTN is a ISO 355 radial bearing sized 50 x 85 x 26 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 50 mm |
| Outer diameter D | 85 mm |
| Width B | 26 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 96 kN |
| Basic static load rating C0 | 121 kN |
| Limiting speed (mechanical) | 4200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 583 g |
| Manufacturer designation | NTN 33110 |
| Standard | ISO 355 |
| Catalog version | NTN Ball and Roller Bearings CAT.No.2203E |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN Ball and Roller Bearings CAT.No.2203E) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN Ball and Roller Bearings CAT.No.2203E); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.com.
Dimensions in inches & 33100-series range
| Bore d | 1.969 in |
|---|---|
| Outer diameter D | 3.346 in |
| Width B | 1.024 in |
| ISO bore code | 10 |
| Radial section height (D−d)/2 | 17.5 mm |
| Smallest bore in 33100-series | 40 mm |
| Largest outer diameter in 33100-series | 200 mm |
| Width range across 33100-series | 26–62 mm |
| Bore position in 33100-series (smallest first) | 3 of 13 |
| Bore above smallest 33100-series size | 10 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33110 | SKF | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 33110-NTN model number is decoded
33110 is a metric single-row tapered roller bearing in the NTN 4T programme: a pressed-steel cage guides profiled rollers between a separable cone and cup on the 50×85 mm ISO 355 envelope, with 26 mm overall assembled width T. NTN also quotes this bearing with its ISO 355 dimension-series abbreviation, 3CE, which is the maker-neutral cross-reference for the 50×85 mm envelope; 4T is NTN's own tapered-roller brand mark on the parts. With no letter after the number, 33110 is the basic open 4T execution: steel cage, normal adjustment, no seal or special internal-design suffix in the order code. Selection: C 96 kN against C0 121 kN gives a C0/C ratio of 1.26 for the 50 mm bore, and the equivalent combined load must keep below the rating at the target L10 with the pair counted as one unit. Fillet radii must clear the ring chamfers of the 85 mm cup and 50 mm cone; use undercut shoulders so the rings seat fully rather than bridging on a shaft radius.
Typical equipment & failure modes
Common applications
- truck and bus wheel hubs in paired arrangements
- industrial gearbox and speed-reducer shafts
- bevel and helical pinion drives with high thrust component
- pump and compressor drive shafts carrying combined load
Known failure patterns
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- preload loss from racewear when one bearing of the paired set is replaced without re-adjusting end play
- rib scoring when axial load is carried beyond the cone rib capacity of the adjusted pair
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- rolling-contact fatigue after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- Hub and pinion bearings of this 50 mm bore class are commonly adjusted in pairs; verify end play against the axle drawing and re-torque after bedding-in rather than trusting the initial preload on 33110.
- The light-wide 33100 family at 50 mm bore (85×26 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 5,600 r/min oil ceiling.
- The 17.5 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 33110 or the ring will bottom out on the radius instead of the shoulder face.
- Back-to-back and face-to-face arrangements react differently to shaft bending: pick the pair orientation for the moment load before locking the 50 mm shoulder geometry, because retrofitting flips the cups.
- ISO 355 makes the 50×85 mm envelope interchangeable but not the ratings: NTN prints 96/121 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- The 96/121 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 33110 (ISO 355 3CE); internal geometry legitimately differs between manufacturers, so re-verify ratings, adjustment and suffix before substituting another make on a rated drive.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 33110?
33110 is a metric 4T tapered roller bearing to ISO 355: 50 mm bore, 85 mm outside diameter and 26 mm assembled width T (1.969 × 3.346 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 96 kN, C0 121 kN (2203E prints no Pu for this size), grease limiting speed 4,200 r/min, oil speed 5,600 r/min, mass about 583 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 33110?
4T is NTN's tapered roller bearing brand mark, stamped on the cone and cup in the factory. It identifies the NTN 4T programme and is not a dimension, so the catalogue and this page list the bare ISO 355 number (33110); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 33110 designation encode the 50 mm bore and what is 3CE?
last two digits 10 are the ISO bore code, ×5 = 50 mm (codes 00–03 use the 10/12/15/17 exception table). The 85 mm OD and 26 mm assembled T follow the ISO 355 dimension-series plan. 3CE is the maker-neutral ISO 355 abbreviation for this dimension series (the same code other manufacturers print); 4T is NTN's own brand mark.
Why does 33110 list two speeds, 4,200 and 5,600 r/min?
The lower figure, 4,200 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 33110 at 5,600 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 33110 mean?
It is the basic open 4T execution — steel cage, adjusted mounting, no seal or feature suffix. NTN uses U for the uprated design, UTG for ULTAGE large-bearing specs, X for the ISO boundary section, and C/CA/D/A for contact-angle or internal-design variants; all are separate order numbers.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN Ball and Roller Bearings CAT.No.2203E on 2026-10-01. Read our editorial & correction policy.