430313DX bearing: complete specifications & equivalents
The 430313DX is a ANSI ABMA 19.2 radial bearing sized 65 x 140 x 79 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 65 mm |
| Outer diameter D | 140 mm |
| Width B | 79 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 330 kN |
| Basic static load rating C0 | 410 kN |
| Limiting speed (mechanical) | 2000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 5260 g |
| Manufacturer designation | NTN 4T-430313DX |
| 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 | 2.559 in |
|---|---|
| Outer diameter D | 5.512 in |
| Width B | 3.11 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 37.5 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) | 6 of 41 |
| Bore above smallest 4t-430-series size | 25 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 430313DX | 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 430313DX model number is decoded
4T-430313DX 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 65×140×79 mm. Unlike a pair of single-row bearings, the TDO unit of 4T-430313DX integrates both rows in one article: the 79 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-430313DX locates the shaft in both directions with C0 410 kN behind the static check of the more heavily loaded row. TDO construction means the two cone assemblies of 4T-430313DX 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 65 mm shaft. Re-lubrication holes and grooves of the housing should line up with the cup's mid-width so fresh grease reaches both roller rows of 4T-430313DX.
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
- edge loading on one row when the housing seats the double cup cocked across its width
- overheated running after a field attempt to "tighten up" the factory-set internal clearance
- one-row flaking when a bent shaft concentrates the combined load on a single row of the pair
- cage damage when the unit is lifted by one cone instead of the double cup during fitting
- false brinelling on a stored or standby unit exposed to vibration
Selection pitfalls — read before you substitute
- Mount the 65 mm unit by induction heating (max 120 °C); at 5.26 kg a cocked lift damages the cages and ribs before the bearing ever runs.
- The 430 light plan keeps 4T-430313DX narrower and faster than the 432 heavy execution of the same 65 mm bore; where shock or a high thrust share dominates, verify whether the heavier 432-family row is the intended position.
- The 330 kN C already includes two-row load sharing — do not double it when pairing the unit with a floating bearing in the L10 calculation.
- An unloaded 4T-430313DX near 2,000 r/min lets rollers skid; ensure a minimum load or light spring preload on high-speed positions.
- Never interchange a TDO double-row unit with two single-row bearings of similar size: the 79 mm width, load spread and clearance logic of 4T-430313DX are unit-specific.
- The 330/410 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-430313DX; 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-430313DX?
4T-430313DX is a double-row tapered roller bearing of TDO (back-to-back) construction: 65 mm bore, 140 mm outside diameter and 79 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 330 kN, C0 410 kN (2203E prints a dash for Cu on this size), grease limiting speed 2,000 r/min, oil speed 2,700 r/min, mass about 5.26 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 65 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-430313DX 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-430313DX 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 79 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 430313DX mean?
Suffix reading on 430313DX: 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-430313DX list two speeds, 2,000 and 2,700 r/min?
The lower figure, 2,000 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-430313DX at 2,700 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.