430330UUTG bearing: complete specifications & equivalents
The 430330UUTG is a ANSI ABMA 19.2 radial bearing sized 150 x 320 x 154 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 150 mm |
| Outer diameter D | 320 mm |
| Width B | 154 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1810 kN |
| Basic static load rating C0 | 2140 kN |
| Fatigue load limit Pu | 201 kN |
| Limiting speed (mechanical) | 990 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 54600 g |
| Manufacturer designation | NTN 4T-430330UUTG |
| 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 | 5.906 in |
|---|---|
| Outer diameter D | 12.598 in |
| Width B | 6.063 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 85 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) | 19 of 41 |
| Bore above smallest 4t-430-series size | 110 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 430330UUTG | 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 430330UUTG model number is decoded
4T-430330UUTG 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 150×320×154 mm. 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 — 430330UUTG reads accordingly. The 12.1 kN of dynamic capacity per millimetre of bore summarises the 1810 kN rating over the 150 mm bore — compare substitution candidates on this ratio and on the 154 mm width. The internal clearance of 4T-430330UUTG is set at the factory by the double cup and spacer-less grinding; do not attempt to re-adjust it with shaft nuts — the 154 mm overall width is the finished dimension. The preset clearance suits the standard temperature range; unusual thermal gradients between shaft and housing call for a clearance review against the 150 mm size before ordering 4T-430330UUTG.
Typical equipment & failure modes
Common applications
- cement-plant mill and kiln drive trains
- port-crane hoist and luffing gearboxes
- heavy press and forging-machine drives
- large shredder and recycler main 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
- pressed-steel cage pocket wear from roller skid at light load and high speed
- indentation of both raceways by hard particles in an open, unsealed arrangement
Selection pitfalls — read before you substitute
- At 150 mm bore the 4T-430330UUTG unit needs hydraulic or crane-assisted fitting and a verified oil supply; manual methods cannot control seating at the 1810 kN C level.
- The 430 light plan keeps 4T-430330UUTG narrower and faster than the 432 heavy execution of the same 150 mm bore; where shock or a high thrust share dominates, verify whether the heavier 432-family row is the intended position.
- The 85.0 mm section leaves little room for oversized shaft fillets; follow the 2203E chamfer table for 4T-430330UUTG or the cones bottom out on the radius.
- An unloaded 4T-430330UUTG near 990 r/min lets rollers skid; ensure a minimum load or light spring preload on high-speed positions.
- An unloaded 4T-430330UUTG near 990 r/min lets rollers skid; ensure a minimum load or light spring preload on high-speed positions.
- The 1810/2140 kN ratings and 201 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-430330UUTG; 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-430330UUTG?
4T-430330UUTG is a double-row tapered roller bearing of TDO (back-to-back) construction: 150 mm bore, 320 mm outside diameter and 154 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 1810 kN, C0 2140 kN, Cu 201 kN, grease limiting speed 990 r/min, oil speed 1,400 r/min, mass about 54.6 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 150 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-430330UUTG 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-430330UUTG 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 154 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 430330UUTG mean?
Suffix reading on 430330UUTG: 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-430330UUTG list two speeds, 990 and 1,400 r/min?
The lower figure, 990 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-430330UUTG 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.