32072UTG bearing: complete specifications & equivalents
The 32072UTG is a ISO 355 radial bearing sized 360 x 540 x 112 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 360 mm |
| Outer diameter D | 540 mm |
| Width B | 112 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2230 kN |
| Basic static load rating C0 | 3300 kN |
| Fatigue load limit Pu | 258 kN |
| Limiting speed (mechanical) | 550 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 83000 g |
| Manufacturer designation | NTN 32072UTG |
| 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 | 14.173 in |
|---|---|
| Outer diameter D | 21.26 in |
| Width B | 4.409 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 90 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) | 39 of 43 |
| Bore above smallest 32000-series size | 340 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32072UTG | 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 32072UTG model number is decoded
The NTN 2203E table prints 32072UTG in the low-section 32000 family tuned for low friction: 360 mm bore, 540 mm cup OD, 112 mm T, with a grease limiting speed of 550 r/min and an oil-lubricated ceiling of 780 r/min. Digit by digit, the bare number identifies the low-section 32000 family tuned for low friction and a bore code resolving to 360 mm; 540 mm OD and 112 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. 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. Grease relubrication at 550 r/min limiting speed targets the rib contact; if the drive needs 780 r/min it must be arranged for oil lubrication with a defined flow to the large roller ends. With a rotating shaft a m6/n6 shaft seat and a press-fit cup are typical catalogue practice for 32072UTG; reverse the logic if the cup rotates, and re-verify against load direction and magnitude.
Typical equipment & failure modes
Common applications
- cement-plant kiln and mill drive trains
- rolling-mill roll-neck and gearbox positions
- large crusher and SAG/AG-mill drive shafts
- wind-turbine gearbox and main-shaft arrangements
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
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- rolling-contact fatigue after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- At 360 mm bore the 32072UTG 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 2230 kN C level.
- The thin 112 mm section of 32072UTG is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 360 mm bore smears the roller ends against the rib.
- Replacing one half of an adjusted pair without resetting end play negates the 112 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- Replacing one half of an adjusted pair without resetting end play negates the 112 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- Replacing one half of an adjusted pair without resetting end play negates the 112 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 2230/3300 kN ratings and 258 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32072UTG; 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 32072UTG?
32072UTG is a metric 4T tapered roller bearing to ISO 355: 360 mm bore, 540 mm outside diameter and 112 mm assembled width T (14.173 × 21.26 × 4.409 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2230 kN, C0 3300 kN, Pu 258 kN, grease limiting speed 550 r/min, oil speed 780 r/min, mass about 83000 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32072UTG?
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 (32072UTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32072UTG designation encode the 360 mm bore?
last two digits 72 are the ISO bore code, ×5 = 360 mm (codes 00–03 use the 10/12/15/17 exception table). The 540 mm OD and 112 mm assembled T follow the ISO 355 dimension-series plan.
Why does 32072UTG list two speeds, 550 and 780 r/min?
The lower figure, 550 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32072UTG at 780 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32072UTG mean?
Suffix reading on 32072UTG: 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.