430221XU bearing: complete specifications & equivalents
The 430221XU is a ANSI ABMA 19.2 radial bearing sized 105 x 190 x 88 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 105 mm |
| Outer diameter D | 190 mm |
| Width B | 88 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 545 kN |
| Basic static load rating C0 | 760 kN |
| Fatigue load limit Pu | 82.5 kN |
| Limiting speed (mechanical) | 1600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 9800 g |
| Manufacturer designation | NTN 4T-430221XU |
| 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 | 4.134 in |
|---|---|
| Outer diameter D | 7.48 in |
| Width B | 3.465 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 42.5 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) | 14 of 41 |
| Bore above smallest 4t-430-series size | 65 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 430221XU | 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 430221XU model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the order number 4T-430221XU denotes the light-duty 430-family TDO double-row series — a 105 mm bore double-row tapered unit rated 545 kN basic dynamic and 760 kN static. Unlike a pair of single-row bearings, the TDO unit of 4T-430221XU integrates both rows in one article: the 88 mm overall width and the internal clearance are ground and set by NTN, so there is no field adjustment dimension. The 42.5 mm radial section over the 105 mm bore carries two roller rows across the 88 mm width; abutment shoulders must clear both cone bores and the double-cup OD. TDO construction means the two cone assemblies of 4T-430221XU 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 105 mm shaft. The preset clearance suits the standard temperature range; unusual thermal gradients between shaft and housing call for a clearance review against the 105 mm size before ordering 4T-430221XU.
Typical equipment & failure modes
Common applications
- large mixer and agitator shafts
- heavy gearbox and mill drive shafts
- crusher and screening-plant main shafts
- large fan and blower shafts with thrust reversal
Known failure patterns
- roller large-end smearing against the cone ribs when one row of the unit runs starved of lubricant
- 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
- cage damage when the unit is lifted by one cone instead of the double cup during fitting
- water-induced pitting when washdown reaches the open unit without external seals
Selection pitfalls — read before you substitute
- Mount the 105 mm unit by induction heating (max 120 °C); at 9.8 kg a cocked lift damages the cages and ribs before the bearing ever runs.
- The 430 light plan keeps 4T-430221XU narrower and faster than the 432 heavy execution of the same 105 mm bore; where shock or a high thrust share dominates, verify whether the heavier 432-family row is the intended position.
- Open 4T-430221XU units have no seals: the housing must seal both rows or the 1,600 r/min grease figure is meaningless once contamination enters.
- Clamping the double cup with a cocked end cover pinches one row: tighten the 190 mm OD clamping uniformly around the circumference.
- The internal clearance of 4T-430221XU is factory-set: no end-play adjustment exists at mounting, and any attempt to set preload with a shaft nut overloads one row.
- The 545/760 kN ratings and 82.5 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-430221XU; 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-430221XU?
4T-430221XU is a double-row tapered roller bearing of TDO (back-to-back) construction: 105 mm bore, 190 mm outside diameter and 88 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 545 kN, C0 760 kN, Cu 82.5 kN, grease limiting speed 1,600 r/min, oil speed 2,100 r/min, mass about 9.8 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 105 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-430221XU 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-430221XU 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 88 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 430221XU mean?
Suffix reading on 430221XU: 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-430221XU list two speeds, 1,600 and 2,100 r/min?
The lower figure, 1,600 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-430221XU at 2,100 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.