323152UTG bearing: complete specifications & equivalents
The 323152UTG is a ANSI ABMA 19.2 radial bearing sized 260 x 440 x 144 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 260 mm |
| Outer diameter D | 440 mm |
| Width B | 144 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2510 kN |
| Basic static load rating C0 | 3750 kN |
| Fatigue load limit Pu | 310 kN |
| Limiting speed (mechanical) | 640 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 90500 g |
| Manufacturer designation | NTN 4T-323152UTG |
| 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-432-series range
| Bore d | 10.236 in |
|---|---|
| Outer diameter D | 17.323 in |
| Width B | 5.669 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 90 mm |
| Smallest bore in 4t-432-series | 40 mm |
| Largest outer diameter in 4t-432-series | 790 mm |
| Width range across 4t-432-series | 46–266 mm |
| Bore position in 4t-432-series (smallest first) | 27 of 39 |
| Bore above smallest 4t-432-series size | 220 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 323152UTG | 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 323152UTG model number is decoded
For a 260 mm shaft needing a compact two-direction thrust location, NTN lists 4T-323152UTG, a TDO double-row 4T unit of 2510 kN C and 3750 kN C0 in the heavy-duty 432-family TDO double-row series. 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 — 323152UTG reads accordingly. The 9.7 kN of dynamic capacity per millimetre of bore summarises the 2510 kN rating over the 260 mm bore — compare substitution candidates on this ratio and on the 144 mm width. TDO construction means the two cone assemblies of 4T-323152UTG 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 260 mm shaft. Moment loads are reacted by the wide row spread of the TDO unit; if the shaft also carries a floating bearing, keep the float clear of 4T-323152UTG's locating position.
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
- roller large-end smearing against the cone ribs when one row of the unit runs starved of lubricant
- one-row flaking when a bent shaft concentrates the combined load on a single row of the pair
- overheated running after a field attempt to "tighten up" the factory-set internal clearance
- cage damage when the unit is lifted by one cone instead of the double cup during fitting
- false brinelling on a stored or standby unit exposed to vibration
Selection pitfalls — read before you substitute
- At 260 mm bore the 4T-323152UTG unit needs hydraulic or crane-assisted fitting and a verified oil supply; manual methods cannot control seating at the 2510 kN C level.
- The 432 heavy plan gives 4T-323152UTG its 144 mm width and 2510 kN rating at the 260 mm bore; do not downgrade to a 430-family unit of the same bore without re-checking C, C0 and the 310 kN Cu.
- Grease packs must leave free volume across the 144 mm width; over-greasing a unit churning near the 910 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 440 mm OD clamping uniformly around the circumference.
- Grease packs must leave free volume across the 144 mm width; over-greasing a unit churning near the 910 r/min oil-band speed raises temperature and expels the grease.
- The 2510/3750 kN ratings and 310 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-323152UTG; 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-323152UTG?
4T-323152UTG is a double-row tapered roller bearing of TDO (back-to-back) construction: 260 mm bore, 440 mm outside diameter and 144 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 2510 kN, C0 3750 kN, Cu 310 kN, grease limiting speed 640 r/min, oil speed 910 r/min, mass about 90.5 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 260 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-323152UTG belongs to the heavy-duty 432-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-323152UTG 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 144 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 323152UTG mean?
Suffix reading on 323152UTG: 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-323152UTG list two speeds, 640 and 910 r/min?
The lower figure, 640 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-323152UTG at 910 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.