430314DX bearing: complete specifications & equivalents
The 430314DX is a ANSI ABMA 19.2 radial bearing sized 70 x 150 x 83 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 70 mm |
| Outer diameter D | 150 mm |
| Width B | 83 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 365 kN |
| Basic static load rating C0 | 460 kN |
| Limiting speed (mechanical) | 1900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 6320 g |
| Manufacturer designation | NTN 4T-430314DX |
| 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 | 2.756 in |
|---|---|
| Outer diameter D | 5.906 in |
| Width B | 3.268 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 40 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) | 7 of 41 |
| Bore above smallest 4t-430-series size | 30 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 430314DX | 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 430314DX model number is decoded
NTN supplies this 70 mm shaft position as 4T-430314DX: a factory-adjusted double-row tapered roller bearing whose two roller rows share one double cup, overall width 83 mm. Reading the designation: the last two digits 14 are the bore code, ×5 = 70 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. Speed planning uses both catalogue columns: grease 1,900 r/min is the mechanical ceiling, oil 2,500 r/min with oil lubrication — a 600 r/min margin at this size. The internal clearance of 4T-430314DX is set at the factory by the double cup and spacer-less grinding; do not attempt to re-adjust it with shaft nuts — the 83 mm overall width is the finished dimension. Induction heating to max 120 °C is the standard fitting method at this 70 mm bore; driving the unit home through the rollers brinells both rows at once.
Typical equipment & failure modes
Common applications
- marine winch and deck-machinery shafts
- bulk-handling stacker/reclaimer travel drives
- large mixer and agitator shafts
- heavy gearbox and mill drive shafts
Known failure patterns
- roller large-end smearing against the cone ribs when one row of the unit runs starved of lubricant
- preload loss and hammering noise when the cup clamping loosens and the unit gains axial float
- brinelling of both rows from a mounting blow transmitted through the roller complements
- 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
- Mount the 70 mm unit by induction heating (max 120 °C); at 6.32 kg a cocked lift damages the cages and ribs before the bearing ever runs.
- The 430 light plan keeps 4T-430314DX narrower and faster than the 432 heavy execution of the same 70 mm bore; where shock or a high thrust share dominates, verify whether the heavier 432-family row is the intended position.
- Lubricant must reach both rows: a housing groove aligned to the cup mid-width of 4T-430314DX feeds the two roller complements evenly; a single-side feed starves the far row.
- The internal clearance of 4T-430314DX is factory-set: no end-play adjustment exists at mounting, and any attempt to set preload with a shaft nut overloads one row.
- At inspection do not mix the cone assemblies of 4T-430314DX with another unit; rows are ground together and re-matching is not guaranteed in the field.
- The 365/460 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-430314DX; 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-430314DX?
4T-430314DX is a double-row tapered roller bearing of TDO (back-to-back) construction: 70 mm bore, 150 mm outside diameter and 83 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 365 kN, C0 460 kN (2203E prints a dash for Cu on this size), grease limiting speed 1,900 r/min, oil speed 2,500 r/min, mass about 6.32 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 70 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-430314DX 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-430314DX 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 83 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 430314DX mean?
Suffix reading on 430314DX: 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-430314DX list two speeds, 1,900 and 2,500 r/min?
The lower figure, 1,900 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-430314DX at 2,500 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.