423122 bearing: complete specifications & equivalents
The 423122 is a ANSI ABMA 19.2 radial bearing sized 110 x 180 x 70 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 110 mm |
| Outer diameter D | 180 mm |
| Width B | 70 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 330 kN |
| Basic static load rating C0 | 485 kN |
| Fatigue load limit Pu | 53 kN |
| Limiting speed (mechanical) | 1600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 6380 g |
| Manufacturer designation | NTN 4T-423122 |
| 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 | 4.331 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 2.756 in |
| ISO bore code | 22 |
| 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) | 15 of 41 |
| Bore above smallest 4t-430-series size | 70 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 423122 | 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 423122 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the order number 4T-423122 denotes the light-duty 430-family TDO double-row series — a 110 mm bore double-row tapered unit rated 330 kN basic dynamic and 485 kN static. 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 — 423122 reads accordingly. Catalogue mass of 4T-423122 is 6.38 kg; lifting and fitting tackle must be rated for the whole preset unit, not for single-ring handling. TDO construction means the two cone assemblies of 4T-423122 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 110 mm shaft. Axial clamping of the double cup must be uniform around the 180 mm OD; a cocked end cover pinches one row and destroys the factory clearance setting.
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
- brinelling of both rows from a mounting blow transmitted through the roller complements
- preload loss and hammering noise when the cup clamping loosens and the unit gains axial float
- pressed-steel cage pocket wear from roller skid at light load and high speed
- false brinelling on a stored or standby unit exposed to vibration
Selection pitfalls — read before you substitute
- Mount the 110 mm unit by induction heating (max 120 °C); at 6.38 kg a cocked lift damages the cages and ribs before the bearing ever runs.
- The 430 light plan keeps 4T-423122 narrower and faster than the 432 heavy execution of the same 110 mm bore; where shock or a high thrust share dominates, verify whether the heavier 432-family row is the intended position.
- The 330 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 internal clearance of 4T-423122 is factory-set: no end-play adjustment exists at mounting, and any attempt to set preload with a shaft nut overloads one row.
- The 330 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 330/485 kN ratings and 53 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-423122; 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-423122?
4T-423122 is a double-row tapered roller bearing of TDO (back-to-back) construction: 110 mm bore, 180 mm outside diameter and 70 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 330 kN, C0 485 kN, Cu 53 kN, grease limiting speed 1,600 r/min, oil speed 2,200 r/min, mass about 6.38 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 110 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-423122 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-423122 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 70 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 423122 mean?
With no letter suffix, 423122 is the basic open double-row execution: steel cages, factory-set internal clearance, no feature suffix in the order code.
Why does 4T-423122 list two speeds, 1,600 and 2,200 r/min?
The lower figure, 1,600 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-423122 at 2,200 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.