323034E1 bearing: complete specifications & equivalents
The 323034E1 is a ANSI ABMA 19.2 radial bearing sized 170 x 260 x 67 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 170 mm |
| Outer diameter D | 260 mm |
| Width B | 67 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 545 kN |
| Basic static load rating C0 | 865 kN |
| Fatigue load limit Pu | 83.5 kN |
| Limiting speed (mechanical) | 1100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 12800 g |
| Manufacturer designation | NTN 4T-323034E1 |
| 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 | 6.693 in |
|---|---|
| Outer diameter D | 10.236 in |
| Width B | 2.638 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 45 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) | 21 of 39 |
| Bore above smallest 4t-432-series size | 130 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 323034E1 | 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 323034E1 model number is decoded
For a 170 mm shaft needing a compact two-direction thrust location, NTN lists 4T-323034E1, a TDO double-row 4T unit of 545 kN C and 865 kN C0 in the heavy-duty 432-family TDO double-row series. The 4T- prefix is NTN's tapered roller quality mark; 430 numbers the light TDO plan and 432 the heavy TDO plan — at the same 170 mm bore the 432 execution carries a wider, heavier section than the 430. Catalogue mass of 4T-323034E1 is 12.8 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-323034E1 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 170 mm shaft. The open unit carries no seals; the housing of 4T-323034E1 must provide sealing and the grease fill or oil feed to both rows.
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
- edge loading on one row when the housing seats the double cup cocked across its width
- 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
- 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
- At 170 mm bore the 4T-323034E1 unit needs hydraulic or crane-assisted fitting and a verified oil supply; manual methods cannot control seating at the 545 kN C level.
- The 432 heavy plan gives 4T-323034E1 its 67 mm width and 545 kN rating at the 170 mm bore; do not downgrade to a 430-family unit of the same bore without re-checking C, C0 and the 83.5 kN Cu.
- The 545 kN C already includes two-row load sharing — do not double it when pairing the unit with a floating bearing in the L10 calculation.
- Grease packs must leave free volume across the 67 mm width; over-greasing a unit churning near the 1,400 r/min oil-band speed raises temperature and expels the grease.
- The 45.0 mm section leaves little room for oversized shaft fillets; follow the 2203E chamfer table for 4T-323034E1 or the cones bottom out on the radius.
- The 545/865 kN ratings and 83.5 kN Cu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-323034E1; 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-323034E1?
4T-323034E1 is a double-row tapered roller bearing of TDO (back-to-back) construction: 170 mm bore, 260 mm outside diameter and 67 mm overall width. From NTN Ball and Roller Bearings CAT.No.2203E: C 545 kN, C0 865 kN, Cu 83.5 kN, grease limiting speed 1,100 r/min, oil speed 1,400 r/min, mass about 12.8 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 170 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-323034E1 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-323034E1 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 67 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 323034E1 mean?
Suffix reading on 323034E1: E1 is an internal-design revision of the base number, not a seal or clearance code; suffixed variants are separate order numbers and are not interchangeable articles.
Why does 4T-323034E1 list two speeds, 1,100 and 1,400 r/min?
The lower figure, 1,100 r/min, is the grease-lubricated limiting speed for the two rows and their cages. With oil lubrication NTN rates 4T-323034E1 at 1,400 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.