432314U bearing: complete specifications & equivalents
The 432314U is a ANSI ABMA 19.2 radial bearing sized 70 x 150 x 116 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 | 116 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 590 kN |
| Basic static load rating C0 | 805 kN |
| Fatigue load limit Pu | 95.5 kN |
| Limiting speed (mechanical) | 2200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 9280 g |
| Manufacturer designation | NTN 4T-432314U |
| 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-432-series range
| Bore d | 2.756 in |
|---|---|
| Outer diameter D | 5.906 in |
| Width B | 4.567 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 40 mm |
| Smallest bore in 4t-432-series | 40 mm |
| Largest outer diameter in 4t-432-series | 790 mm |
| Width range across 4t-432-series | 46–266 mm |
| Bore position in 4t-432-series (smallest first) | 7 of 39 |
| Bore above smallest 4t-432-series size | 30 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 432314U | 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 432314U model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the order number 4T-432314U denotes the heavy-duty 432-family TDO double-row series — a 70 mm bore double-row tapered unit rated 590 kN basic dynamic and 805 kN static. Unlike a pair of single-row bearings, the TDO unit of 4T-432314U integrates both rows in one article: the 116 mm overall width and the internal clearance are ground and set by NTN, so there is no field adjustment dimension. Speed planning uses both catalogue columns: grease 2,200 r/min is the mechanical ceiling, oil 2,900 r/min with oil lubrication — a 700 r/min margin at this size. TDO construction means the two cone assemblies of 4T-432314U 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 70 mm shaft. 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
- 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
- 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 fatigue after continuous running near the grease limiting speed without oil cooling
- water-induced pitting when washdown reaches the open unit without external seals
Selection pitfalls — read before you substitute
- Mount the 70 mm unit by induction heating (max 120 °C); at 9.28 kg a cocked lift damages the cages and ribs before the bearing ever runs.
- The 432 heavy plan gives 4T-432314U its 116 mm width and 590 kN rating at the 70 mm bore; do not downgrade to a 430-family unit of the same bore without re-checking C, C0 and the 95.5 kN Cu.
- Lubricant must reach both rows: a housing groove aligned to the cup mid-width of 4T-432314U feeds the two roller complements evenly; a single-side feed starves the far row.
- The internal clearance of 4T-432314U 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-432314U with another unit; rows are ground together and re-matching is not guaranteed in the field.
- The 590/805 kN ratings and 95.5 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-432314U; 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-432314U?
4T-432314U is a double-row tapered roller bearing of TDO (back-to-back) construction: 70 mm bore, 150 mm outside diameter and 116 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 590 kN, C0 805 kN, Cu 95.5 kN, grease limiting speed 2,200 r/min, oil speed 2,900 r/min, mass about 9.28 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-432314U belongs to the heavy-duty 432-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-432314U 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 116 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 432314U mean?
Suffix reading on 432314U: 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-432314U 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-432314U 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.