430309DX bearing: complete specifications & equivalents
The 430309DX is a ANSI ABMA 19.2 radial bearing sized 45 x 100 x 60 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 45 mm |
| Outer diameter D | 100 mm |
| Width B | 60 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 183 kN |
| Basic static load rating C0 | 218 kN |
| Limiting speed (mechanical) | 2800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2110 g |
| Manufacturer designation | NTN 4T-430309DX |
| 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 | 1.772 in |
|---|---|
| Outer diameter D | 3.937 in |
| Width B | 2.362 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 27.5 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) | 2 of 41 |
| Bore above smallest 4t-430-series size | 5 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 430309DX | 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 430309DX model number is decoded
4T-430309DX 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 45×100×60 mm. Large sizes continue the plans under different leading digits: 4130/4131 and 4230/4231 belong to the 430-family dimension plan, while 3230/3231 continue the 432 heavy plan — 430309DX reads accordingly. Catalogue mass of 4T-430309DX is 2.11 kg; lifting and fitting tackle must be rated for the whole preset unit, not for single-ring handling. The internal clearance of 4T-430309DX is set at the factory by the double cup and spacer-less grinding; do not attempt to re-adjust it with shaft nuts — the 60 mm overall width is the finished dimension. At 183 kN C the unit offers about 4.1 kN per millimetre of the 45 mm bore — heavy-section TDO rows of this class run warm, so confirm oil availability before working near 3,800 r/min.
Typical equipment & failure modes
Common applications
- crane travel and hoist drum shafts
- mining conveyor drive and head pulleys
- paper-machine roll and press supports
- extruder and mixer drive 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 damage when the unit is lifted by one cone instead of the double cup during fitting
- indentation of both raceways by hard particles in an open, unsealed arrangement
Selection pitfalls — read before you substitute
- Gearbox positions of this 45 mm class rely on the preset clearance of 4T-430309DX; shimming or nut-tightening the unit like a single-row pair overruns the factory setting and runs the rows hot.
- The 430 light plan keeps 4T-430309DX narrower and faster than the 432 heavy execution of the same 45 mm bore; where shock or a high thrust share dominates, verify whether the heavier 432-family row is the intended position.
- Grease packs must leave free volume across the 60 mm width; over-greasing a unit churning near the 3,800 r/min oil-band speed raises temperature and expels the grease.
- Grease packs must leave free volume across the 60 mm width; over-greasing a unit churning near the 3,800 r/min oil-band speed raises temperature and expels the grease.
- Clamping the double cup with a cocked end cover pinches one row: tighten the 100 mm OD clamping uniformly around the circumference.
- The 183/218 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-430309DX; 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-430309DX?
4T-430309DX is a double-row tapered roller bearing of TDO (back-to-back) construction: 45 mm bore, 100 mm outside diameter and 60 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 183 kN, C0 218 kN (2203E prints a dash for Cu on this size), grease limiting speed 2,800 r/min, oil speed 3,800 r/min, mass about 2.11 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 45 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-430309DX 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-430309DX 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 60 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 430309DX mean?
Suffix reading on 430309DX: 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-430309DX list two speeds, 2,800 and 3,800 r/min?
The lower figure, 2,800 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-430309DX at 3,800 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.