430324XU bearing: complete specifications & equivalents
The 430324XU is a ANSI ABMA 19.2 radial bearing sized 120 x 260 x 128 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 120 mm |
| Outer diameter D | 260 mm |
| Width B | 128 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1060 kN |
| Basic static load rating C0 | 1390 kN |
| Fatigue load limit Pu | 139 kN |
| Limiting speed (mechanical) | 1200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 30300 g |
| Manufacturer designation | NTN 4T-430324XU |
| 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 | 4.724 in |
|---|---|
| Outer diameter D | 10.236 in |
| Width B | 5.039 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 70 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) | 16 of 41 |
| Bore above smallest 4t-430-series size | 80 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 430324XU | 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 430324XU model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the order number 4T-430324XU denotes the light-duty 430-family TDO double-row series — a 120 mm bore double-row tapered unit rated 1060 kN basic dynamic and 1390 kN static. Reading the designation: the last two digits 24 are the bore code, ×5 = 120 mm (codes 00–03 use the 10/12/15/17 exception table); the leading digits place the bearing in the light-duty 430-family TDO double-row series. The 70.0 mm radial section over the 120 mm bore carries two roller rows across the 128 mm width; abutment shoulders must clear both cone bores and the double-cup OD. The internal clearance of 4T-430324XU is set at the factory by the double cup and spacer-less grinding; do not attempt to re-adjust it with shaft nuts — the 128 mm overall width is the finished dimension. 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-430324XU'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 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 120 mm bore the 4T-430324XU unit needs hydraulic or crane-assisted fitting and a verified oil supply; manual methods cannot control seating at the 1060 kN C level.
- The 430 light plan keeps 4T-430324XU narrower and faster than the 432 heavy execution of the same 120 mm bore; where shock or a high thrust share dominates, verify whether the heavier 432-family row is the intended position.
- The 1060 kN C already includes two-row load sharing — do not double it when pairing the unit with a floating bearing in the L10 calculation.
- The 70.0 mm section leaves little room for oversized shaft fillets; follow the 2203E chamfer table for 4T-430324XU or the cones bottom out on the radius.
- The 1060 kN C already includes two-row load sharing — do not double it when pairing the unit with a floating bearing in the L10 calculation.
- The 1060/1390 kN ratings and 139 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-430324XU; 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-430324XU?
4T-430324XU is a double-row tapered roller bearing of TDO (back-to-back) construction: 120 mm bore, 260 mm outside diameter and 128 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 1060 kN, C0 1390 kN, Cu 139 kN, grease limiting speed 1,200 r/min, oil speed 1,700 r/min, mass about 30.3 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 120 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-430324XU 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-430324XU 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 128 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 430324XU mean?
Suffix reading on 430324XU: U marks the uprated/reinforced internal design, a separate order number with higher capacity than the basic execution; X marks the boundary-dimension revision of the base number (D and width differ from the plain number of the same bore); suffixed variants are separate order numbers and are not interchangeable articles.
Why does 4T-430324XU list two speeds, 1,200 and 1,700 r/min?
The lower figure, 1,200 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-430324XU at 1,700 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.