30264UTG bearing: complete specifications & equivalents
The 30264UTG is a ISO 355 radial bearing sized 320 x 580 x 104 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 | 104 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2130 kN |
| Basic static load rating C0 | 2580 kN |
| Fatigue load limit Pu | 201 kN |
| Limiting speed (mechanical) | 540 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 100000 g |
| Manufacturer designation | NTN 30264UTG |
| 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 & 30200-series range
| Bore d | 12.598 in |
|---|---|
| Outer diameter D | 22.835 in |
| Width B | 4.094 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 130 mm |
| Smallest bore in 30200-series | 15 mm |
| Largest outer diameter in 30200-series | 580 mm |
| Width range across 30200-series | 11.75–104 mm |
| Bore position in 30200-series (smallest first) | 37 of 37 |
| Bore above smallest 30200-series size | 305 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 30264UTG | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
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 30264UTG model number is decoded
The NTN 2203E table prints 30264UTG in the standard-section 30200 family: 320 mm bore, 580 mm cup OD, 104 mm T, with a grease limiting speed of 540 r/min and an oil-lubricated ceiling of 770 r/min. NTN also quotes this bearing with its ISO 355 dimension-series abbreviation which is the maker-neutral cross-reference for the 320×580 mm envelope; 4T is NTN's own tapered-roller brand mark on the parts. The pressed-steel cage and surface-finished roller ends are standard 4T execution; ULTAGE-marked variants use upgraded material and internal geometry aimed at longer rating life with the same ISO 355 envelope. The 130.0 mm section height over the 320 mm bore positions the load centre; axial location of the pair depends on that contact line, so spacer faces must be square within the P0 tolerance of the bearing. 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 30264UTG.
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 damage from a mounting blow delivered through the roller complement instead of the ring face
- edge loading when shaft deflection exceeds the few arc-minutes of misalignment the adjusted pair allows
Selection pitfalls — read before you substitute
- At 320 mm bore the 30264UTG 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 2130 kN C level.
- The standard-section 30200 family at 320 mm bore (580×104 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.
- On slash-size and T-code bearings confirm the full code on both cone and cup before fitting: the 320 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- The 130.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 30264UTG or the ring will bottom out on the radius instead of the shoulder face.
- Replacing one half of an adjusted pair without resetting end play negates the 104 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 2130/2580 kN ratings and 201 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 30264UTG; 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 30264UTG?
30264UTG is a metric 4T tapered roller bearing to ISO 355: 320 mm bore, 580 mm outside diameter and 104 mm assembled width T (12.598 × 22.835 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2130 kN, C0 2580 kN, Pu 201 kN, grease limiting speed 540 r/min, oil speed 770 r/min, mass about 100000 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 30264UTG?
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 (30264UTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 30264UTG 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 104 mm assembled T follow the ISO 355 dimension-series plan.
Why does 30264UTG 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 30264UTG 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 30264UTG mean?
Suffix reading on 30264UTG: 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.