30222U bearing: complete specifications & equivalents
The 30222U is a ISO 355 radial bearing sized 110 x 200 x 41 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 110 mm |
| Outer diameter D | 200 mm |
| Width B | 41 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 360 kN |
| Basic static load rating C0 | 435 kN |
| Fatigue load limit Pu | 46.5 kN |
| Limiting speed (mechanical) | 1800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 5190 g |
| Manufacturer designation | NTN 30222U |
| 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 & 30200-series range
| Bore d | 4.331 in |
|---|---|
| Outer diameter D | 7.874 in |
| Width B | 1.614 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 45 mm |
| Smallest bore in 30200-series | 15 mm |
| Largest outer diameter in 30200-series | 580 mm |
| Width range across 30200-series | 11.75–104 mm |
| Bore position in 30200-series (smallest first) | 22 of 37 |
| Bore above smallest 30200-series size | 95 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 30222U | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the 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 30222U model number is decoded
30222U 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 110×200 mm ISO 355 envelope, with 41 mm overall assembled width T. Digit by digit, the bare number identifies the standard-section 30200 family and a bore code resolving to 110 mm; 200 mm OD and 41 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. NTN grades 4T metric bearings as open bearings without integral seals; at 110 mm bore the application supplies the seals and the grease fill or oil supply to the 3FB ISO 355 assembly. Selection: C 360 kN against C0 435 kN gives a C0/C ratio of 1.21 for the 110 mm bore, and the equivalent combined load must keep below the rating at the target L10 with the pair counted as one unit. After mounting check the contact pattern with marking blue: a pattern biased to the large or small roller end means the 110 mm pair is misadjusted and the 41 mm T set will edge-load in service.
Typical equipment & failure modes
Common applications
- large agricultural and forestry machine axles
- heavy industrial gearboxes and crane travel drives
- rolling-mill auxiliary and pinion-stand shafts
- large conveyor and bucket-elevator pulleys
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
- cage fatigue when the pair is run continuously near the grease limiting speed without oil cooling
- edge loading when shaft deflection exceeds the few arc-minutes of misalignment the adjusted pair allows
Selection pitfalls — read before you substitute
- Mount the 110 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 5190 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The standard-section 30200 family at 110 mm bore (200×41 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 2,400 r/min oil ceiling.
- Open 30222U units have no seals: a wheel-hub or gearbox application needs external sealing or the 1,800 r/min grease figure is meaningless once water reaches the cone rib.
- Minimum load matters at high speed: an unloaded 30222U at a large fraction of 1,800 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- The 45.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 30222U or the ring will bottom out on the radius instead of the shoulder face.
- The 360/435 kN ratings and 46.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 30222U (ISO 355 3FB); 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 30222U?
30222U is a metric 4T tapered roller bearing to ISO 355: 110 mm bore, 200 mm outside diameter and 41 mm assembled width T (4.331 × 7.874 × 1.614 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 360 kN, C0 435 kN, Pu 46.5 kN, grease limiting speed 1,800 r/min, oil speed 2,400 r/min, mass about 5190 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 30222U?
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 (30222U); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 30222U designation encode the 110 mm bore and what is 3FB?
last two digits 22 are the ISO bore code, ×5 = 110 mm (codes 00–03 use the 10/12/15/17 exception table). The 200 mm OD and 41 mm assembled T follow the ISO 355 dimension-series plan. 3FB 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 30222U list two speeds, 1,800 and 2,400 r/min?
The lower figure, 1,800 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 30222U at 2,400 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 30222U mean?
Suffix reading on 30222U: U marks the reinforced/uprated internal design of the bare number, a separate order number with higher load capacity than the basic execution; the suffix is part of the order number and the variants are not interchangeable articles.
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.