32260UTG bearing: complete specifications & equivalents
The 32260UTG is a ISO 355 radial bearing sized 300 x 540 x 149 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 300 mm |
| Outer diameter D | 540 mm |
| Width B | 149 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2950 kN |
| Basic static load rating C0 | 4100 kN |
| Fatigue load limit Pu | 325 kN |
| Limiting speed (mechanical) | 580 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 140000 g |
| Manufacturer designation | NTN 32260UTG |
| 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 & 32200-series range
| Bore d | 11.811 in |
|---|---|
| Outer diameter D | 21.26 in |
| Width B | 5.866 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 120 mm |
| Smallest bore in 32200-series | 17 mm |
| Largest outer diameter in 32200-series | 580 mm |
| Width range across 32200-series | 17.25–159 mm |
| Bore position in 32200-series (smallest first) | 35 of 36 |
| Bore above smallest 32200-series size | 283 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32260UTG | 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 32260UTG model number is decoded
32260UTG is a metric single-row tapered roller bearing in the NTN 4T programme: a pressed-steel cage guides profiled rollers between a separable cone and cup on the 300×540 mm ISO 355 envelope, with 149 mm overall assembled width T. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32260UTG by the metric ISO 355 number: 300 mm bore, 540 mm OD. NTN grades 4T metric bearings as open bearings without integral seals; at 300 mm bore the application supplies the seals and the grease fill or oil supply to the ISO 355 assembly. Selection: C 2950 kN against C0 4100 kN gives a C0/C ratio of 1.39 for the 300 mm bore, and the equivalent combined load must keep below the rating at the target L10 with the pair counted as one unit. When pairing 32260UTG with a second tapered bearing, keep the matched arrangement clean: a single stray grit particle between cup and housing changes preload faster than the adjustment range can correct.
Typical equipment & failure modes
Common applications
- heavy haul railway traction gearboxes
- large marine propulsion reduction gears
- cement-plant kiln and mill drive trains
- rolling-mill roll-neck and gearbox positions
Known failure patterns
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- smearing on the roller large ends and cone rib after a dry start with preload but no oil film
- flaking on one cone only when a back-to-back / face-to-face pair is loaded unevenly by a bent shaft
- 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 300 mm bore the 32260UTG 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 2950 kN C level.
- The heavy-section 32200 family at 300 mm bore (540×149 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 830 r/min oil ceiling.
- Replacing one half of an adjusted pair without resetting end play negates the 149 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 32260UTG at a large fraction of 580 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- The 120.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 32260UTG or the ring will bottom out on the radius instead of the shoulder face.
- The 2950/4100 kN ratings and 325 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32260UTG; 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 32260UTG?
32260UTG is a metric 4T tapered roller bearing to ISO 355: 300 mm bore, 540 mm outside diameter and 149 mm assembled width T (11.811 × 21.26 × 5.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2950 kN, C0 4100 kN, Pu 325 kN, grease limiting speed 580 r/min, oil speed 830 r/min, mass about 140000 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32260UTG?
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 (32260UTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32260UTG designation encode the 300 mm bore?
last two digits 60 are the ISO bore code, ×5 = 300 mm (codes 00–03 use the 10/12/15/17 exception table). The 540 mm OD and 149 mm assembled T follow the ISO 355 dimension-series plan.
Why does 32260UTG list two speeds, 580 and 830 r/min?
The lower figure, 580 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32260UTG at 830 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32260UTG mean?
Suffix reading on 32260UTG: the UTG suffix marks the ULTAGE specification for large NTN tapered rollers — upgraded material and internal design for longer life inside the unchanged ISO 355 envelope; 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.