30236UUTG bearing: complete specifications & equivalents
The 30236UUTG is a ISO 355 radial bearing sized 180 x 320 x 57 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 180 mm |
| Outer diameter D | 320 mm |
| Width B | 57 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 805 kN |
| Basic static load rating C0 | 890 kN |
| Fatigue load limit Pu | 82.5 kN |
| Limiting speed (mechanical) | 1100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 17800 g |
| Manufacturer designation | NTN 30236UUTG |
| 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 | 7.087 in |
|---|---|
| Outer diameter D | 12.598 in |
| Width B | 2.244 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 70 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) | 29 of 37 |
| Bore above smallest 30200-series size | 165 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 30236UUTG | 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 30236UUTG model number is decoded
30236UUTG belongs to the NTN metric 4T tapered roller range (standard-section 30200 family); the open bearing leaves sealing to the application and is normally ordered and mounted as an adjustable matched pair. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 30236UUTG by the metric ISO 355 number (ISO series abbreviation 4GB): 180 mm bore, 320 mm OD. Suffix reading on 30236UUTG: the UUTG suffix marks the ULTAGE specification for large NTN tapered rollers — upgraded material and internal design for longer life inside the unchanged ISO 355 envelope; the suffix is part of the order number and the variants are not interchangeable articles. The fatigue load limit Pu printed for 30236UUTG is 82.5 kN; in the adjusted-life equation that is the equivalent-load floor below which high reliability is expected even under contamination. Re-adjustment after bedding-in is standard practice: re-check end play once the paired 30236UUTG arrangement has run in, because initial seat seating relaxes the set preload slightly.
Typical equipment & failure modes
Common applications
- large crusher and SAG/AG-mill drive shafts
- wind-turbine gearbox and main-shaft arrangements
- offshore crane and drawworks drums
- heavy haul railway traction gearboxes
Known failure patterns
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- rib scoring when axial load is carried beyond the cone rib capacity of the adjusted pair
- preload loss from racewear when one bearing of the paired set is replaced without re-adjusting end play
- cage fatigue when the pair is run continuously near the grease limiting speed without oil cooling
- brinell marks on cone and cup raceways from impact during handling or hammering during fitting
Selection pitfalls — read before you substitute
- At 180 mm bore the 30236UUTG 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 805 kN C level.
- The standard-section 30200 family at 180 mm bore (320×57 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 1,500 r/min oil ceiling.
- Replacing one half of an adjusted pair without resetting end play negates the 57 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 70.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 30236UUTG or the ring will bottom out on the radius instead of the shoulder face.
- ISO 355 makes the 180×320 mm envelope interchangeable but not the ratings: NTN prints 805/890 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- The 805/890 kN ratings and 82.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 30236UUTG (ISO 355 4GB); 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 30236UUTG?
30236UUTG is a metric 4T tapered roller bearing to ISO 355: 180 mm bore, 320 mm outside diameter and 57 mm assembled width T (7.087 × 12.598 × 2.244 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 805 kN, C0 890 kN, Pu 82.5 kN, grease limiting speed 1,100 r/min, oil speed 1,500 r/min, mass about 17800 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 30236UUTG?
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 (30236UUTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 30236UUTG designation encode the 180 mm bore and what is 4GB?
last two digits 36 are the ISO bore code, ×5 = 180 mm (codes 00–03 use the 10/12/15/17 exception table). The 320 mm OD and 57 mm assembled T follow the ISO 355 dimension-series plan. 4GB 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 30236UUTG list two speeds, 1,100 and 1,500 r/min?
The lower figure, 1,100 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 30236UUTG at 1,500 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 30236UUTG mean?
Suffix reading on 30236UUTG: the UUTG suffix marks the ULTAGE specification for large NTN tapered rollers — upgraded material and internal design for longer life inside the unchanged ISO 355 envelope; 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.