32034XU bearing: complete specifications & equivalents
The 32034XU is a ISO 355 radial bearing sized 170 x 260 x 57 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 | 57 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 555 kN |
| Basic static load rating C0 | 895 kN |
| Fatigue load limit Pu | 86.5 kN |
| Limiting speed (mechanical) | 1300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 10600 g |
| Manufacturer designation | NTN 32034XU |
| Standard | ISO 355 |
| Catalog version | NTN Ball and Roller Bearings CAT.No.2203E |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN Ball and Roller Bearings CAT.No.2203E) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN Ball and Roller Bearings CAT.No.2203E); 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 & 32000-series range
| Bore d | 6.693 in |
|---|---|
| Outer diameter D | 10.236 in |
| Width B | 2.244 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 45 mm |
| Smallest bore in 32000-series | 20 mm |
| Largest outer diameter in 32000-series | 650 mm |
| Width range across 32000-series | 15–130 mm |
| Bore position in 32000-series (smallest first) | 28 of 43 |
| Bore above smallest 32000-series size | 150 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32034XU | 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 32034XU model number is decoded
The NTN 2203E table prints 32034XU in the low-section 32000 family tuned for low friction: 170 mm bore, 260 mm cup OD, 57 mm T, with a grease limiting speed of 1,300 r/min and an oil-lubricated ceiling of 1,700 r/min. Digit by digit, the bare number identifies the low-section 32000 family tuned for low friction and a bore code resolving to 170 mm; 260 mm OD and 57 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. The printed contact-angle geometry gives the low-section 32000 family tuned for low friction its characteristic load split — at 555/895 kN (C/C0) the static rating is about 1.61× C, typical of tapered bearings proportioned for heavy combined duty. The fatigue load limit Pu printed for 32034XU is 86.5 kN; in the adjusted-life equation that is the equivalent-load floor below which high reliability is expected even under contamination. Re-adjustment after bedding-in is standard practice: re-check end play once the paired 32034XU arrangement has run in, because initial seat seating relaxes the set preload slightly.
Typical equipment & failure modes
Common applications
- offshore crane and drawworks drums
- heavy haul railway traction gearboxes
- large marine propulsion reduction gears
- cement-plant kiln and mill drive trains
Known failure patterns
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- rib scoring when axial load is carried beyond the cone rib capacity of the adjusted pair
- preload loss from racewear when one bearing of the paired set is replaced without re-adjusting end play
- cage damage from a mounting blow delivered through the roller complement instead of the ring face
- indentation of the raceways by hard particles in unsealed open arrangements
Selection pitfalls — read before you substitute
- At 170 mm bore the 32034XU set is adjusted with hydraulic nuts on large mill and wind positions; follow the drive-up angle/end-play procedure, because manual torque methods cannot control preload at the 555 kN C level.
- The thin 57 mm section of 32034XU is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 170 mm bore smears the roller ends against the rib.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 32034XU by size alone can deliver the wrong contact-angle execution for a pinion position.
- Replacing one half of an adjusted pair without resetting end play negates the 57 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- Minimum load matters at high speed: an unloaded 32034XU at a large fraction of 1,300 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- The 555/895 kN ratings and 86.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32034XU (ISO 355 4EC); internal geometry legitimately differs between manufacturers, so re-verify ratings, adjustment and suffix before substituting another make on a rated drive.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 32034XU?
32034XU is a metric 4T tapered roller bearing to ISO 355: 170 mm bore, 260 mm outside diameter and 57 mm assembled width T (6.693 × 10.236 × 2.244 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 895 kN, Pu 86.5 kN, grease limiting speed 1,300 r/min, oil speed 1,700 r/min, mass about 10600 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32034XU?
4T is NTN's tapered roller bearing brand mark, stamped on the cone and cup in the factory. It identifies the NTN 4T programme and is not a dimension, so the catalogue and this page list the bare ISO 355 number (32034XU); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32034XU designation encode the 170 mm bore and what is 4EC?
last two digits 34 are the ISO bore code, ×5 = 170 mm (codes 00–03 use the 10/12/15/17 exception table). The 260 mm OD and 57 mm assembled T follow the ISO 355 dimension-series plan. 4EC is the maker-neutral ISO 355 abbreviation for this dimension series (the same code other manufacturers print); 4T is NTN's own brand mark.
Why does 32034XU list two speeds, 1,300 and 1,700 r/min?
The lower figure, 1,300 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32034XU at 1,700 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32034XU mean?
Suffix reading on 32034XU: XU combines the X ISO boundary section with the U uprated internal design; U marks the reinforced/uprated internal design of the bare number, a separate order number with higher load capacity than the basic execution; the suffix is part of the order number and the variants are not interchangeable articles.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN Ball and Roller Bearings CAT.No.2203E on 2026-10-01. Read our editorial & correction policy.