430312DX bearing: complete specifications & equivalents
The 430312DX is a ANSI ABMA 19.2 radial bearing sized 60 x 130 x 74 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 60 mm |
| Outer diameter D | 130 mm |
| Width B | 74 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 286 kN |
| Basic static load rating C0 | 350 kN |
| Limiting speed (mechanical) | 2200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4300 g |
| Manufacturer designation | NTN 4T-430312DX |
| 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 | 2.362 in |
|---|---|
| Outer diameter D | 5.118 in |
| Width B | 2.913 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 35 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) | 5 of 41 |
| Bore above smallest 4t-430-series size | 20 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 430312DX | 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 430312DX model number is decoded
For a 60 mm shaft needing a compact two-direction thrust location, NTN lists 4T-430312DX, a TDO double-row 4T unit of 286 kN C and 350 kN C0 in the light-duty 430-family TDO double-row series. Suffix reading on 430312DX: 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. Catalogue mass of 4T-430312DX is 4.3 kg; lifting and fitting tackle must be rated for the whole preset unit, not for single-ring handling. TDO construction means the two cone assemblies of 4T-430312DX 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 60 mm shaft. With a rotating shaft a k5/m5 seat on the 60 mm journal and a located cup in the housing are typical practice for 4T-430312DX.
Typical equipment & failure modes
Common applications
- heavy gearbox and mill drive shafts
- crusher and screening-plant main shafts
- large fan and blower shafts with thrust reversal
- steel-plant roller table and conveyor drives
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 fatigue after continuous running near the grease limiting speed without oil cooling
- false brinelling on a stored or standby unit exposed to vibration
Selection pitfalls — read before you substitute
- Mount the 60 mm unit by induction heating (max 120 °C); at 4.3 kg a cocked lift damages the cages and ribs before the bearing ever runs.
- The 430 light plan keeps 4T-430312DX narrower and faster than the 432 heavy execution of the same 60 mm bore; where shock or a high thrust share dominates, verify whether the heavier 432-family row is the intended position.
- Clamping the double cup with a cocked end cover pinches one row: tighten the 130 mm OD clamping uniformly around the circumference.
- The 35.0 mm section leaves little room for oversized shaft fillets; follow the 2203E chamfer table for 4T-430312DX or the cones bottom out on the radius.
- Open 4T-430312DX units have no seals: the housing must seal both rows or the 2,200 r/min grease figure is meaningless once contamination enters.
- The 286/350 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-430312DX; 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-430312DX?
4T-430312DX is a double-row tapered roller bearing of TDO (back-to-back) construction: 60 mm bore, 130 mm outside diameter and 74 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 286 kN, C0 350 kN (2203E prints a dash for Cu on this size), grease limiting speed 2,200 r/min, oil speed 2,900 r/min, mass about 4.3 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 60 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-430312DX 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-430312DX 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 74 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 430312DX mean?
Suffix reading on 430312DX: 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-430312DX list two speeds, 2,200 and 2,900 r/min?
The lower figure, 2,200 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-430312DX at 2,900 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.