430234UUTG bearing: complete specifications & equivalents
The 430234UUTG is a ANSI ABMA 19.2 radial bearing sized 170 x 310 x 125 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 170 mm |
| Outer diameter D | 310 mm |
| Width B | 125 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1340 kN |
| Basic static load rating C0 | 1690 kN |
| Fatigue load limit Pu | 159 kN |
| Limiting speed (mechanical) | 950 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 37100 g |
| Manufacturer designation | NTN 4T-430234UUTG |
| 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 | 6.693 in |
|---|---|
| Outer diameter D | 12.205 in |
| Width B | 4.921 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 70 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) | 21 of 41 |
| Bore above smallest 4t-430-series size | 130 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 430234UUTG | 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 430234UUTG model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the order number 4T-430234UUTG denotes the light-duty 430-family TDO double-row series — a 170 mm bore double-row tapered unit rated 1340 kN basic dynamic and 1690 kN static. Suffix reading on 430234UUTG: UTG marks the ULTAGE specification for large NTN tapered rollers — upgraded material and internal design, printed with the ＊ symbol ahead of the order number; U marks the uprated/reinforced internal design, a separate order number with higher capacity than the basic execution; suffixed variants are separate order numbers and are not interchangeable articles. Axial capacity is bidirectional because the rows are opposed: 4T-430234UUTG locates the shaft in both directions with C0 1690 kN behind the static check of the more heavily loaded row. TDO construction means the two cone assemblies of 4T-430234UUTG face away from each other inside one double cup: the load lines diverge outward, giving a wide effective spread and high moment stiffness for the 170 mm shaft. The preset clearance suits the standard temperature range; unusual thermal gradients between shaft and housing call for a clearance review against the 170 mm size before ordering 4T-430234UUTG.
Typical equipment & failure modes
Common applications
- port-crane hoist and luffing gearboxes
- heavy press and forging-machine drives
- large shredder and recycler main shafts
- power-plant mill and fan shafts
Known failure patterns
- edge loading on one row when the housing seats the double cup cocked across its width
- 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 damage when the unit is lifted by one cone instead of the double cup during fitting
- water-induced pitting when washdown reaches the open unit without external seals
Selection pitfalls — read before you substitute
- At 170 mm bore the 4T-430234UUTG unit needs hydraulic or crane-assisted fitting and a verified oil supply; manual methods cannot control seating at the 1340 kN C level.
- The 430 light plan keeps 4T-430234UUTG narrower and faster than the 432 heavy execution of the same 170 mm bore; where shock or a high thrust share dominates, verify whether the heavier 432-family row is the intended position.
- The internal clearance of 4T-430234UUTG is factory-set: no end-play adjustment exists at mounting, and any attempt to set preload with a shaft nut overloads one row.
- At inspection do not mix the cone assemblies of 4T-430234UUTG with another unit; rows are ground together and re-matching is not guaranteed in the field.
- Open 4T-430234UUTG units have no seals: the housing must seal both rows or the 950 r/min grease figure is meaningless once contamination enters.
- The 1340/1690 kN ratings and 159 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-430234UUTG; 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-430234UUTG?
4T-430234UUTG is a double-row tapered roller bearing of TDO (back-to-back) construction: 170 mm bore, 310 mm outside diameter and 125 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 1340 kN, C0 1690 kN, Cu 159 kN, grease limiting speed 950 r/min, oil speed 1,400 r/min, mass about 37.1 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 170 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-430234UUTG 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-430234UUTG 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 125 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 430234UUTG mean?
Suffix reading on 430234UUTG: UTG marks the ULTAGE specification for large NTN tapered rollers — upgraded material and internal design, printed with the ＊ symbol ahead of the order number; U marks the uprated/reinforced internal design, a separate order number with higher capacity than the basic execution; suffixed variants are separate order numbers and are not interchangeable articles.
Why does 4T-430234UUTG list two speeds, 950 and 1,400 r/min?
The lower figure, 950 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-430234UUTG at 1,400 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.