430312U bearing: complete specifications & equivalents
The 430312U 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 | 340 kN |
| Basic static load rating C0 | 420 kN |
| Fatigue load limit Pu | 51 kN |
| Limiting speed (mechanical) | 2500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4310 g |
| Manufacturer designation | NTN 4T-430312U |
| 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 |
|---|---|---|---|
| 430312U | 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 430312U model number is decoded
NTN supplies this 60 mm shaft position as 4T-430312U: a factory-adjusted double-row tapered roller bearing whose two roller rows share one double cup, overall width 74 mm. Unlike a pair of single-row bearings, the TDO unit of 4T-430312U integrates both rows in one article: the 74 mm overall width and the internal clearance are ground and set by NTN, so there is no field adjustment dimension. The fatigue load limit Cu printed for 4T-430312U is 51 kN — the equivalent-load floor below which high reliability is expected even under contamination in the adjusted-life equation. Because the unit is preset, mounting 4T-430312U resembles mounting a double-row spherical or cylindrical bearing: seat the unit, clamp axially to the stated end cover torque, and verify rotation — no end-play measurement is required. 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-430312U.
Typical equipment & failure modes
Common applications
- crusher and screening-plant main shafts
- large fan and blower shafts with thrust reversal
- steel-plant roller table and conveyor drives
- marine winch and deck-machinery 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
- thermal distress when the oil supply sized for one row starves the second row
Selection pitfalls — read before you substitute
- Mount the 60 mm unit by induction heating (max 120 °C); at 4.31 kg a cocked lift damages the cages and ribs before the bearing ever runs.
- The 430 light plan keeps 4T-430312U 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.
- At inspection do not mix the cone assemblies of 4T-430312U with another unit; rows are ground together and re-matching is not guaranteed in the field.
- At inspection do not mix the cone assemblies of 4T-430312U with another unit; rows are ground together and re-matching is not guaranteed in the field.
- The 340/420 kN ratings and 51 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-430312U; 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-430312U?
4T-430312U 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 340 kN, C0 420 kN, Cu 51 kN, grease limiting speed 2,500 r/min, oil speed 3,400 r/min, mass about 4.31 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-430312U 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-430312U 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 430312U mean?
Suffix reading on 430312U: U marks the uprated/reinforced internal design, a separate order number with higher capacity than the basic execution; suffixed variants are separate order numbers and are not interchangeable articles.
Why does 4T-430312U list two speeds, 2,500 and 3,400 r/min?
The lower figure, 2,500 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-430312U at 3,400 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.