423064UTG bearing: complete specifications & equivalents
The 423064UTG is a ANSI ABMA 19.2 radial bearing sized 320 x 480 x 151 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 320 mm |
| Outer diameter D | 480 mm |
| Width B | 151 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2030 kN |
| Basic static load rating C0 | 3100 kN |
| Fatigue load limit Pu | 247 kN |
| Limiting speed (mechanical) | 530 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 82000 g |
| Manufacturer designation | NTN 4T-423064UTG |
| 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 | 12.598 in |
|---|---|
| Outer diameter D | 18.898 in |
| Width B | 5.945 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) | 30 of 41 |
| Bore above smallest 4t-430-series size | 280 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 423064UTG | 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 423064UTG model number is decoded
The NTN 2203E double-row table prints 4T-423064UTG at 320 mm bore, 480 mm OD and 151 mm overall width, with a grease limiting speed of 530 r/min and an oil ceiling of 750 r/min. Unlike a pair of single-row bearings, the TDO unit of 4T-423064UTG integrates both rows in one article: the 151 mm overall width and the internal clearance are ground and set by NTN, so there is no field adjustment dimension. Axial capacity is bidirectional because the rows are opposed: 4T-423064UTG locates the shaft in both directions with C0 3100 kN behind the static check of the more heavily loaded row. Because the unit is preset, mounting 4T-423064UTG resembles mounting a double-row spherical or cylindrical bearing: seat the unit, clamp axially to the stated end cover torque, and verify rotation — no end-play measurement is required. Fillet radii and shoulder heights must follow the 2203E mounting table for 4T-423064UTG; the double cup must seat square across its full 151 mm width.
Typical equipment & failure modes
Common applications
- large shredder and recycler main shafts
- power-plant mill and fan shafts
- rolling-mill roll-neck and pinion-stand positions
- mine hoist and dragline drum shafts
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
- pressed-steel cage pocket wear from roller skid at light load and high speed
- rolling-contact fatigue spalling after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- At 320 mm bore the 4T-423064UTG unit needs hydraulic or crane-assisted fitting and a verified oil supply; manual methods cannot control seating at the 2030 kN C level.
- The 430 light plan keeps 4T-423064UTG narrower and faster than the 432 heavy execution of the same 320 mm bore; where shock or a high thrust share dominates, verify whether the heavier 432-family row is the intended position.
- Grease packs must leave free volume across the 151 mm width; over-greasing a unit churning near the 750 r/min oil-band speed raises temperature and expels the grease.
- Clamping the double cup with a cocked end cover pinches one row: tighten the 480 mm OD clamping uniformly around the circumference.
- An unloaded 4T-423064UTG near 530 r/min lets rollers skid; ensure a minimum load or light spring preload on high-speed positions.
- The 2030/3100 kN ratings and 247 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-423064UTG; 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-423064UTG?
4T-423064UTG is a double-row tapered roller bearing of TDO (back-to-back) construction: 320 mm bore, 480 mm outside diameter and 151 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 2030 kN, C0 3100 kN, Cu 247 kN, grease limiting speed 530 r/min, oil speed 750 r/min, mass about 82 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 320 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-423064UTG 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-423064UTG 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 151 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 423064UTG mean?
Suffix reading on 423064UTG: 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-423064UTG list two speeds, 530 and 750 r/min?
The lower figure, 530 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-423064UTG at 750 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.