32264UTG bearing: complete specifications & equivalents
The 32264UTG is a ISO 355 radial bearing sized 320 x 580 x 159 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 320 mm |
| Outer diameter D | 580 mm |
| Width B | 159 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 3350 kN |
| Basic static load rating C0 | 4650 kN |
| Fatigue load limit Pu | 360 kN |
| Limiting speed (mechanical) | 540 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 170000 g |
| Manufacturer designation | NTN 32264UTG |
| 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 | 12.598 in |
|---|---|
| Outer diameter D | 22.835 in |
| Width B | 6.26 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 130 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) | 36 of 36 |
| Bore above smallest 32200-series size | 303 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32264UTG | 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 32264UTG model number is decoded
32264UTG belongs to the NTN metric 4T tapered roller range (heavy-section 32200 family); the open bearing leaves sealing to the application and is normally ordered and mounted as an adjustable matched pair. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32264UTG by the metric ISO 355 number: 320 mm bore, 580 mm OD. NTN grades 4T metric bearings as open bearings without integral seals; at 320 mm bore the application supplies the seals and the grease fill or oil supply to the ISO 355 assembly. The two speed columns differ by a factor of .70 (grease/limiting 540 vs oil 770 r/min); heat generation at the cone rib decides which lubrication a real 32264UTG arrangement can sustain. Mount the 320 mm-bore cone on the shaft first (induction heat, max 120 °C), fit the cup square in its housing, then set preload or end play; never drive the cup home through the rollers of 32264UTG.
Typical equipment & failure modes
Common applications
- large crusher and SAG/AG-mill drive shafts
- wind-turbine gearbox and main-shaft arrangements
- offshore crane and drawworks drums
- heavy haul railway traction gearboxes
Known failure patterns
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- 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 fatigue when the pair is run continuously near the grease limiting speed without oil cooling
- false brinelling on a stationary paired set exposed to external vibration
Selection pitfalls — read before you substitute
- At 320 mm bore the 32264UTG 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 3350 kN C level.
- The heavy-section 32200 family at 320 mm bore (580×159 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 770 r/min oil ceiling.
- Never fit the 320 mm cone by hammering the 580 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
- Grease packs must leave free volume in the 159 mm-wide set; over-greasing a paired bearing churning at the 770 r/min oil-band speed raises temperature and destroys the preload setting.
- The 130.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 32264UTG or the ring will bottom out on the radius instead of the shoulder face.
- The 3350/4650 kN ratings and 360 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32264UTG; 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 32264UTG?
32264UTG is a metric 4T tapered roller bearing to ISO 355: 320 mm bore, 580 mm outside diameter and 159 mm assembled width T (12.598 × 22.835 × 6.26 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3350 kN, C0 4650 kN, Pu 360 kN, grease limiting speed 540 r/min, oil speed 770 r/min, mass about 170000 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32264UTG?
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 (32264UTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32264UTG designation encode the 320 mm bore?
last two digits 64 are the ISO bore code, ×5 = 320 mm (codes 00–03 use the 10/12/15/17 exception table). The 580 mm OD and 159 mm assembled T follow the ISO 355 dimension-series plan.
Why does 32264UTG list two speeds, 540 and 770 r/min?
The lower figure, 540 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32264UTG at 770 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32264UTG mean?
Suffix reading on 32264UTG: 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.