323072UTG bearing: complete specifications & equivalents
The 323072UTG is a ANSI ABMA 19.2 radial bearing sized 360 x 540 x 134 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 360 mm |
| Outer diameter D | 540 mm |
| Width B | 134 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2630 kN |
| Basic static load rating C0 | 4200 kN |
| Fatigue load limit Pu | 325 kN |
| Limiting speed (mechanical) | 460 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 110000 g |
| Manufacturer designation | NTN 4T-323072UTG |
| 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 | 14.173 in |
|---|---|
| Outer diameter D | 21.26 in |
| Width B | 5.276 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) | 32 of 39 |
| Bore above smallest 4t-432-series size | 320 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 323072UTG | 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 323072UTG model number is decoded
4T-323072UTG is an NTN double-row tapered roller bearing of TDO (back-to-back) construction: two cone assemblies against one double cup, supplied as a preset unit of 360×540×134 mm. Unlike a pair of single-row bearings, the TDO unit of 4T-323072UTG integrates both rows in one article: the 134 mm overall width and the internal clearance are ground and set by NTN, so there is no field adjustment dimension. Speed planning uses both catalogue columns: grease 460 r/min is the mechanical ceiling, oil 660 r/min with oil lubrication — a 200 r/min margin at this size. The internal clearance of 4T-323072UTG is set at the factory by the double cup and spacer-less grinding; do not attempt to re-adjust it with shaft nuts — the 134 mm overall width is the finished dimension. The open unit carries no seals; the housing of 4T-323072UTG must provide sealing and the grease fill or oil feed to both rows.
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
- 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 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 360 mm bore the 4T-323072UTG unit needs hydraulic or crane-assisted fitting and a verified oil supply; manual methods cannot control seating at the 2630 kN C level.
- The 432 heavy plan gives 4T-323072UTG its 134 mm width and 2630 kN rating at the 360 mm bore; do not downgrade to a 430-family unit of the same bore without re-checking C, C0 and the 325 kN Cu.
- Open 4T-323072UTG units have no seals: the housing must seal both rows or the 460 r/min grease figure is meaningless once contamination enters.
- At inspection do not mix the cone assemblies of 4T-323072UTG with another unit; rows are ground together and re-matching is not guaranteed in the field.
- Grease packs must leave free volume across the 134 mm width; over-greasing a unit churning near the 660 r/min oil-band speed raises temperature and expels the grease.
- The 2630/4200 kN ratings and 325 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-323072UTG; 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-323072UTG?
4T-323072UTG is a double-row tapered roller bearing of TDO (back-to-back) construction: 360 mm bore, 540 mm outside diameter and 134 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 2630 kN, C0 4200 kN, Cu 325 kN, grease limiting speed 460 r/min, oil speed 660 r/min, mass about 110 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 360 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-323072UTG 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-323072UTG 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 134 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 323072UTG mean?
Suffix reading on 323072UTG: 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-323072UTG list two speeds, 460 and 660 r/min?
The lower figure, 460 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-323072UTG at 660 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.