423148UTG bearing: complete specifications & equivalents
The 423148UTG is a ANSI ABMA 19.2 radial bearing sized 240 x 400 x 160 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 240 mm |
| Outer diameter D | 400 mm |
| Width B | 160 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1790 kN |
| Basic static load rating C0 | 2600 kN |
| Fatigue load limit Pu | 223 kN |
| Limiting speed (mechanical) | 690 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 71400 g |
| Manufacturer designation | NTN 4T-423148UTG |
| 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 | 9.449 in |
|---|---|
| Outer diameter D | 15.748 in |
| Width B | 6.299 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 80 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) | 26 of 41 |
| Bore above smallest 4t-430-series size | 200 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 423148UTG | 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 423148UTG model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the order number 4T-423148UTG denotes the light-duty 430-family TDO double-row series — a 240 mm bore double-row tapered unit rated 1790 kN basic dynamic and 2600 kN static. Large sizes continue the plans under different leading digits: 4130/4131 and 4230/4231 belong to the 430-family dimension plan, while 3230/3231 continue the 432 heavy plan — 423148UTG reads accordingly. Selection: C 1790 kN against C0 2600 kN gives a C0/C ratio of 1.45; the two rows of 4T-423148UTG share the combined load as one bearing position. TDO construction means the two cone assemblies of 4T-423148UTG 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 240 mm shaft. Axial clamping of the double cup must be uniform around the 400 mm OD; a cocked end cover pinches one row and destroys the factory clearance setting.
Typical equipment & failure modes
Common applications
- mine hoist and dragline drum shafts
- cement-plant mill and kiln drive trains
- port-crane hoist and luffing gearboxes
- heavy press and forging-machine drives
Known failure patterns
- edge loading on one row when the housing seats the double cup cocked across its width
- brinelling of both rows from a mounting blow transmitted through the roller complements
- preload loss and hammering noise when the cup clamping loosens and the unit gains axial float
- cage fatigue after continuous running near the grease limiting speed without oil cooling
- false brinelling on a stored or standby unit exposed to vibration
Selection pitfalls — read before you substitute
- At 240 mm bore the 4T-423148UTG unit needs hydraulic or crane-assisted fitting and a verified oil supply; manual methods cannot control seating at the 1790 kN C level.
- The 430 light plan keeps 4T-423148UTG narrower and faster than the 432 heavy execution of the same 240 mm bore; where shock or a high thrust share dominates, verify whether the heavier 432-family row is the intended position.
- The 1790 kN C already includes two-row load sharing — do not double it when pairing the unit with a floating bearing in the L10 calculation.
- At inspection do not mix the cone assemblies of 4T-423148UTG with another unit; rows are ground together and re-matching is not guaranteed in the field.
- Lubricant must reach both rows: a housing groove aligned to the cup mid-width of 4T-423148UTG feeds the two roller complements evenly; a single-side feed starves the far row.
- The 1790/2600 kN ratings and 223 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-423148UTG; 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-423148UTG?
4T-423148UTG is a double-row tapered roller bearing of TDO (back-to-back) construction: 240 mm bore, 400 mm outside diameter and 160 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2600 kN, Cu 223 kN, grease limiting speed 690 r/min, oil speed 1,000 r/min, mass about 71.4 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 240 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-423148UTG 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-423148UTG 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 160 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 423148UTG mean?
Suffix reading on 423148UTG: 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-423148UTG list two speeds, 690 and 1,000 r/min?
The lower figure, 690 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-423148UTG at 1,000 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.