430310DX bearing: complete specifications & equivalents
The 430310DX is a ANSI ABMA 19.2 radial bearing sized 50 x 110 x 64 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 50 mm |
| Outer diameter D | 110 mm |
| Width B | 64 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 216 kN |
| Basic static load rating C0 | 260 kN |
| Limiting speed (mechanical) | 2600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2700 g |
| Manufacturer designation | NTN 4T-430310DX |
| 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 | 1.969 in |
|---|---|
| Outer diameter D | 4.331 in |
| Width B | 2.52 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 30 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) | 3 of 41 |
| Bore above smallest 4t-430-series size | 10 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 430310DX | 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 430310DX model number is decoded
4T-430310DX belongs to the light-duty 430-family TDO double-row series of NTN double-row tapered roller bearings; the unit is mounted as one article and its internal clearance is set at the factory, not on the shaft. Unlike a pair of single-row bearings, the TDO unit of 4T-430310DX integrates both rows in one article: the 64 mm overall width and the internal clearance are ground and set by NTN, so there is no field adjustment dimension. Axial capacity is bidirectional because the rows are opposed: 4T-430310DX locates the shaft in both directions with C0 260 kN behind the static check of the more heavily loaded row. The internal clearance of 4T-430310DX is set at the factory by the double cup and spacer-less grinding; do not attempt to re-adjust it with shaft nuts — the 64 mm overall width is the finished dimension. Fillet radii and shoulder heights must follow the 2203E mounting table for 4T-430310DX; the double cup must seat square across its full 64 mm width.
Typical equipment & failure modes
Common applications
- paper-machine roll and press supports
- extruder and mixer drive shafts
- construction-equipment swing and pivot shafts
- industrial gearbox shafts in a single locating position
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
- indentation of both raceways by hard particles in an open, unsealed arrangement
Selection pitfalls — read before you substitute
- Gearbox positions of this 50 mm class rely on the preset clearance of 4T-430310DX; shimming or nut-tightening the unit like a single-row pair overruns the factory setting and runs the rows hot.
- The 430 light plan keeps 4T-430310DX narrower and faster than the 432 heavy execution of the same 50 mm bore; where shock or a high thrust share dominates, verify whether the heavier 432-family row is the intended position.
- Never interchange a TDO double-row unit with two single-row bearings of similar size: the 64 mm width, load spread and clearance logic of 4T-430310DX are unit-specific.
- The 216 kN C already includes two-row load sharing — do not double it when pairing the unit with a floating bearing in the L10 calculation.
- Clamping the double cup with a cocked end cover pinches one row: tighten the 110 mm OD clamping uniformly around the circumference.
- The 216/260 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-430310DX; 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-430310DX?
4T-430310DX is a double-row tapered roller bearing of TDO (back-to-back) construction: 50 mm bore, 110 mm outside diameter and 64 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 216 kN, C0 260 kN (2203E prints a dash for Cu on this size), grease limiting speed 2,600 r/min, oil speed 3,500 r/min, mass about 2.7 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 50 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-430310DX 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-430310DX 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 64 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 430310DX mean?
Suffix reading on 430310DX: 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-430310DX list two speeds, 2,600 and 3,500 r/min?
The lower figure, 2,600 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-430310DX at 3,500 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.