430318DU bearing: complete specifications & equivalents
The 430318DU is a ANSI ABMA 19.2 radial bearing sized 90 x 190 x 102 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 90 mm |
| Outer diameter D | 190 mm |
| Width B | 102 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 515 kN |
| Basic static load rating C0 | 645 kN |
| Fatigue load limit Pu | 71 kN |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 12200 g |
| Manufacturer designation | NTN 4T-430318DU |
| 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 | 3.543 in |
|---|---|
| Outer diameter D | 7.48 in |
| Width B | 4.016 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 50 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) | 11 of 41 |
| Bore above smallest 4t-430-series size | 50 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 430318DU | 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 430318DU model number is decoded
4T-430318DU 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 90×190×102 mm. Unlike a pair of single-row bearings, the TDO unit of 4T-430318DU integrates both rows in one article: the 102 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 1,500 r/min is the mechanical ceiling, oil 1,900 r/min with oil lubrication — a 400 r/min margin at this size. TDO construction means the two cone assemblies of 4T-430318DU 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 90 mm shaft. Induction heating to max 120 °C is the standard fitting method at this 90 mm bore; driving the unit home through the rollers brinells both rows at once.
Typical equipment & failure modes
Common applications
- bulk-handling stacker/reclaimer travel drives
- large mixer and agitator shafts
- heavy gearbox and mill drive shafts
- crusher and screening-plant main shafts
Known failure patterns
- roller large-end smearing against the cone ribs when one row of the unit runs starved of lubricant
- one-row flaking when a bent shaft concentrates the combined load on a single row of the pair
- overheated running after a field attempt to "tighten up" the factory-set internal clearance
- 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 90 mm unit by induction heating (max 120 °C); at 12.2 kg a cocked lift damages the cages and ribs before the bearing ever runs.
- The 430 light plan keeps 4T-430318DU narrower and faster than the 432 heavy execution of the same 90 mm bore; where shock or a high thrust share dominates, verify whether the heavier 432-family row is the intended position.
- The internal clearance of 4T-430318DU is factory-set: no end-play adjustment exists at mounting, and any attempt to set preload with a shaft nut overloads one row.
- Open 4T-430318DU units have no seals: the housing must seal both rows or the 1,500 r/min grease figure is meaningless once contamination enters.
- The 515 kN C already includes two-row load sharing — do not double it when pairing the unit with a floating bearing in the L10 calculation.
- The 515/645 kN ratings and 71 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-430318DU; 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-430318DU?
4T-430318DU is a double-row tapered roller bearing of TDO (back-to-back) construction: 90 mm bore, 190 mm outside diameter and 102 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 515 kN, C0 645 kN, Cu 71 kN, grease limiting speed 1,500 r/min, oil speed 1,900 r/min, mass about 12.2 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 90 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-430318DU 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-430318DU 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 102 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 430318DU mean?
Suffix reading on 430318DU: U marks the uprated/reinforced internal design, a separate order number with higher capacity than the basic execution; D is an internal-design revision letter of the base number; suffixed variants are separate order numbers and are not interchangeable articles.
Why does 4T-430318DU list two speeds, 1,500 and 1,900 r/min?
The lower figure, 1,500 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-430318DU at 1,900 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.