30226U bearing: complete specifications & equivalents
The 30226U is a ISO 355 radial bearing sized 130 x 230 x 43.75 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 130 mm |
| Outer diameter D | 230 mm |
| Width B | 43.75 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 415 kN |
| Basic static load rating C0 | 505 kN |
| Fatigue load limit Pu | 51.5 kN |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 7050 g |
| Manufacturer designation | NTN 30226U |
| 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 | 5.118 in |
|---|---|
| Outer diameter D | 9.055 in |
| Width B | 1.722 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 50 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) | 24 of 37 |
| Bore above smallest 30200-series size | 115 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 30226U | 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 30226U model number is decoded
For a 130 mm shaft with a thrust component, NTN lists 30226U, a metric 4T tapered roller bearing of 415 kN C and 505 kN C0 inside the 230 mm OD, 43.75 mm-wide assembled set. The last two digits 26 are the ISO bore code, ×5 = 130 mm (codes 00–03 use the 10/12/15/17 exception table) under the ISO 355 numbering; the 43.75 mm value printed here is T, the width of the fully assembled cone-plus-cup set, not the inner-ring width alone. The printed contact-angle geometry gives the standard-section 30200 family its characteristic load split — at 415/505 kN (C/C0) the static rating is about 1.22× C, typical of tapered bearings proportioned for heavy combined duty. The 50.0 mm section height over the 130 mm bore positions the load centre; axial location of the pair depends on that contact line, so spacer faces must be square within the P0 tolerance of the bearing. Fillet radii must clear the ring chamfers of the 230 mm cup and 130 mm cone; use undercut shoulders so the rings seat fully rather than bridging on a shaft radius.
Typical equipment & failure modes
Common applications
- offshore crane and drawworks drums
- heavy haul railway traction gearboxes
- large marine propulsion reduction gears
- cement-plant kiln and mill drive trains
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 damage from a mounting blow delivered through the roller complement instead of the ring face
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- At 130 mm bore the 30226U set is adjusted with hydraulic nuts on large mill and wind positions; follow the drive-up angle/end-play procedure, because manual torque methods cannot control preload at the 415 kN C level.
- The standard-section 30200 family at 130 mm bore (230×43.75 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 2,000 r/min oil ceiling.
- Replacing one half of an adjusted pair without resetting end play negates the 43.75 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- ISO 355 makes the 130×230 mm envelope interchangeable but not the ratings: NTN prints 415/505 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- Minimum load matters at high speed: an unloaded 30226U at a large fraction of 1,500 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- The 415/505 kN ratings and 51.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 30226U (ISO 355 4FB); 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 30226U?
30226U is a metric 4T tapered roller bearing to ISO 355: 130 mm bore, 230 mm outside diameter and 43.75 mm assembled width T (5.118 × 9.055 × 1.722 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 415 kN, C0 505 kN, Pu 51.5 kN, grease limiting speed 1,500 r/min, oil speed 2,000 r/min, mass about 7050 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 30226U?
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 (30226U); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 30226U designation encode the 130 mm bore and what is 4FB?
last two digits 26 are the ISO bore code, ×5 = 130 mm (codes 00–03 use the 10/12/15/17 exception table). The 230 mm OD and 43.75 mm assembled T follow the ISO 355 dimension-series plan. 4FB 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 30226U list two speeds, 1,500 and 2,000 r/min?
The lower figure, 1,500 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 30226U at 2,000 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 30226U mean?
Suffix reading on 30226U: 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.