423024 bearing: complete specifications & equivalents
The 423024 is a ANSI ABMA 19.2 radial bearing sized 120 x 180 x 58 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 120 mm |
| Outer diameter D | 180 mm |
| Width B | 58 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 255 kN |
| Basic static load rating C0 | 375 kN |
| Fatigue load limit Pu | 40 kN |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4350 g |
| Manufacturer designation | NTN 4T-423024 |
| 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 | 4.724 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 2.283 in |
| ISO bore code | 24 |
| Radial section height (D−d)/2 | 30 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) | 16 of 41 |
| Bore above smallest 4t-430-series size | 80 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 423024 | 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 423024 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the order number 4T-423024 denotes the light-duty 430-family TDO double-row series — a 120 mm bore double-row tapered unit rated 255 kN basic dynamic and 375 kN static. Unlike a pair of single-row bearings, the TDO unit of 4T-423024 integrates both rows in one article: the 58 mm overall width and the internal clearance are ground and set by NTN, so there is no field adjustment dimension. The 2.1 kN of dynamic capacity per millimetre of bore summarises the 255 kN rating over the 120 mm bore — compare substitution candidates on this ratio and on the 58 mm width. TDO construction means the two cone assemblies of 4T-423024 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 120 mm shaft. Mount 4T-423024 as one article: lift on the double cup, never on a single cone, or the preset alignment of the two rows is disturbed.
Typical equipment & failure modes
Common applications
- large shredder and recycler main shafts
- power-plant mill and fan shafts
- rolling-mill roll-neck and pinion-stand positions
- mine hoist and dragline drum shafts
Known failure patterns
- roller large-end smearing against the cone ribs when one row of the unit runs starved of lubricant
- 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
- false brinelling on a stored or standby unit exposed to vibration
Selection pitfalls — read before you substitute
- At 120 mm bore the 4T-423024 unit needs hydraulic or crane-assisted fitting and a verified oil supply; manual methods cannot control seating at the 255 kN C level.
- The 430 light plan keeps 4T-423024 narrower and faster than the 432 heavy execution of the same 120 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 58 mm width; over-greasing a unit churning near the 2,100 r/min oil-band speed raises temperature and expels the grease.
- Order by the full 423024 code including suffixes — U, X, DX, E1 and UTG variants share the 120 mm bore but are different articles with different internal geometry.
- An unloaded 4T-423024 near 1,500 r/min lets rollers skid; ensure a minimum load or light spring preload on high-speed positions.
- The 255/375 kN ratings and 40 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-423024; 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-423024?
4T-423024 is a double-row tapered roller bearing of TDO (back-to-back) construction: 120 mm bore, 180 mm outside diameter and 58 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 255 kN, C0 375 kN, Cu 40 kN, grease limiting speed 1,500 r/min, oil speed 2,100 r/min, mass about 4.35 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 120 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-423024 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-423024 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 58 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 423024 mean?
With no letter suffix, 423024 is the basic open double-row execution: steel cages, factory-set internal clearance, no feature suffix in the order code.
Why does 4T-423024 list two speeds, 1,500 and 2,100 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-423024 at 2,100 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.