4230-500UTG bearing: complete specifications & equivalents
The 4230-500UTG is a ANSI ABMA 19.2 radial bearing sized 500 x 720 x 209 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 500 mm |
| Outer diameter D | 720 mm |
| Width B | 209 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 3950 kN |
| Basic static load rating C0 | 6900 kN |
| Fatigue load limit Pu | 485 kN |
| Limiting speed (mechanical) | 320 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 250000 g |
| Manufacturer designation | NTN 4T-4230/500UTG |
| Standard | ANSI ABMA 19.2 |
| Catalog version | NTN 2203E 2026-09-25 |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN 2203E 2026-09-25) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN 2203E 2026-09-25); 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 & 4t-430-series range
| Bore d | 19.685 in |
|---|---|
| Outer diameter D | 28.346 in |
| Width B | 8.228 in |
| ISO bore code | 30 |
| Radial section height (D−d)/2 | 110 mm |
| Smallest bore in 4t-430-series | 40 mm |
| Largest outer diameter in 4t-430-series | 870 mm |
| Width range across 4t-430-series | 45–310 mm |
| Bore position in 4t-430-series (smallest first) | 39 of 41 |
| Bore above smallest 4t-430-series size | 460 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 4230 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 4230-500UTG model number is decoded
4T-4230/500UTG is the NTN 4T catalogue entry for a 500×720×209 mm double-row tapered roller bearing — the TDO arrangement reacts radial load plus thrust in both directions without a second bearing. The 4T- prefix is NTN's tapered roller quality mark; 430 numbers the light TDO plan and 432 the heavy TDO plan — at the same 500 mm bore the 432 execution carries a wider, heavier section than the 430. Grease relubrication at the 320 r/min limiting speed must reach both roller rows; sustaining 450 r/min needs an oil supply with defined flow through the double cup. The internal clearance of 4T-4230/500UTG is set at the factory by the double cup and spacer-less grinding; do not attempt to re-adjust it with shaft nuts — the 209 mm overall width is the finished dimension. With a rotating shaft a m6/n6 seat on the 500 mm journal and a located cup in the housing are typical practice for 4T-4230/500UTG.
Typical equipment & failure modes
Common applications
- heavy press and forging-machine drives
- large shredder and recycler main shafts
- power-plant mill and fan shafts
- rolling-mill roll-neck and pinion-stand positions
Known failure patterns
- roller large-end smearing against the cone ribs when one row of the unit runs starved of lubricant
- preload loss and hammering noise when the cup clamping loosens and the unit gains axial float
- brinelling of both rows from a mounting blow transmitted through the roller complements
- cage fatigue after continuous running near the grease limiting speed without oil cooling
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- At 500 mm bore the 4T-4230/500UTG unit needs hydraulic or crane-assisted fitting and a verified oil supply; manual methods cannot control seating at the 3950 kN C level.
- The 430 light plan keeps 4T-4230/500UTG narrower and faster than the 432 heavy execution of the same 500 mm bore; where shock or a high thrust share dominates, verify whether the heavier 432-family row is the intended position.
- An unloaded 4T-4230/500UTG near 320 r/min lets rollers skid; ensure a minimum load or light spring preload on high-speed positions.
- The internal clearance of 4T-4230/500UTG is factory-set: no end-play adjustment exists at mounting, and any attempt to set preload with a shaft nut overloads one row.
- Order by the full 4230/500UTG code including suffixes — U, X, DX, E1 and UTG variants share the 500 mm bore but are different articles with different internal geometry.
- The 3950/6900 kN ratings and 485 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-4230/500UTG; internal geometry legitimately differs between manufacturers, so re-verify ratings, clearance class and suffix before substituting another make on a rated drive.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 4T-4230/500UTG?
4T-4230/500UTG is a double-row tapered roller bearing of TDO (back-to-back) construction: 500 mm bore, 720 mm outside diameter and 209 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 3950 kN, C0 6900 kN, Cu 485 kN, grease limiting speed 320 r/min, oil speed 450 r/min, mass about 250 kg. It is an open, preset-clearance unit with pressed-steel cages.
What is the difference between the NTN 430 and 432 double-row series at 500 mm bore?
Both are TDO double-row tapered roller units, but 430 is the light plan and 432 the heavy plan: at the same bore the 432 execution is wider and heavier with higher load ratings. 4T-4230/500UTG belongs to the light-duty 430-family TDO double-row series. Large sizes continue the plans as 4130/4131/4230/4231 (430 family) and 3230/3231 (432 family).
Can the internal clearance of 4T-4230/500UTG be adjusted at mounting?
No. The TDO unit — two cone assemblies against one double cup — is ground and set by NTN at the factory, and the 209 mm overall width is the finished dimension. Mounting sets no end play: seat the unit square, clamp the cup uniformly and verify free rotation. Field re-adjustment overloads one row.
What do the suffix letters on 4230/500UTG mean?
Suffix reading on 4230/500UTG: UTG marks the ULTAGE specification for large NTN tapered rollers — upgraded material and internal design, printed with the ＊ symbol ahead of the order number; suffixed variants are separate order numbers and are not interchangeable articles.
Why does 4T-4230/500UTG list two speeds, 320 and 450 r/min?
The lower figure, 320 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-4230/500UTG at 450 r/min because oil removes heat from both roller rows better — the housing feed must reach both rows through the double cup.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN 2203E 2026-09-25 on 2026-10-01. Read our editorial & correction policy.