32980UTG bearing: complete specifications & equivalents
The 32980UTG is a ISO 355 radial bearing sized 400 x 540 x 87 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 400 mm |
| Outer diameter D | 540 mm |
| Width B | 87 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1530 kN |
| Basic static load rating C0 | 2710 kN |
| Fatigue load limit Pu | 207 kN |
| Limiting speed (mechanical) | 520 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 54000 g |
| Manufacturer designation | NTN 32980UTG |
| 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 & 32900-series range
| Bore d | 15.748 in |
|---|---|
| Outer diameter D | 21.26 in |
| Width B | 3.425 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 70 mm |
| Smallest bore in 32900-series | 35 mm |
| Largest outer diameter in 32900-series | 600 mm |
| Width range across 32900-series | 14–100 mm |
| Bore position in 32900-series (smallest first) | 35 of 37 |
| Bore above smallest 32900-series size | 365 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32980UTG | 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 32980UTG model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the NTN order number 32980UTG denotes the extra-light thin-section 32900 family of metric tapered roller bearings, 400 mm bore, 540 mm outside diameter and 87 mm assembled width T (15.748 × 21.26 × 3.425 in) to the ISO 355 boundary plan. Digit by digit, the bare number identifies the extra-light thin-section 32900 family and a bore code resolving to 400 mm; 540 mm OD and 87 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. The rollers run with their large ends against the cone's integral guide rib; the rib/end-flange contact carries the thrust component and is the reason lubricant must reach the rib face of 32980UTG, not only the raceway. The fatigue load limit Pu printed for 32980UTG is 207 kN; in the adjusted-life equation that is the equivalent-load floor below which high reliability is expected even under contamination. After mounting check the contact pattern with marking blue: a pattern biased to the large or small roller end means the 400 mm pair is misadjusted and the 87 mm T set will edge-load in service.
Typical equipment & failure modes
Common applications
- rolling-mill roll-neck and gearbox positions
- large crusher and SAG/AG-mill drive shafts
- wind-turbine gearbox and main-shaft arrangements
- offshore crane and drawworks drums
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
- indentation of the raceways by hard particles in unsealed open arrangements
Selection pitfalls — read before you substitute
- At 400 mm bore the 32980UTG 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 1530 kN C level.
- The thin 87 mm section of 32980UTG is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 400 mm bore smears the roller ends against the rib.
- Never fit the 400 mm cone by hammering the 540 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
- Never fit the 400 mm cone by hammering the 540 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
- Back-to-back and face-to-face arrangements react differently to shaft bending: pick the pair orientation for the moment load before locking the 400 mm shoulder geometry, because retrofitting flips the cups.
- The 1530/2710 kN ratings and 207 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32980UTG; 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 32980UTG?
32980UTG is a metric 4T tapered roller bearing to ISO 355: 400 mm bore, 540 mm outside diameter and 87 mm assembled width T (15.748 × 21.26 × 3.425 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1530 kN, C0 2710 kN, Pu 207 kN, grease limiting speed 520 r/min, oil speed 740 r/min, mass about 54000 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32980UTG?
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 (32980UTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32980UTG designation encode the 400 mm bore?
last two digits 80 are the ISO bore code, ×5 = 400 mm (codes 00–03 use the 10/12/15/17 exception table). The 540 mm OD and 87 mm assembled T follow the ISO 355 dimension-series plan.
Why does 32980UTG list two speeds, 520 and 740 r/min?
The lower figure, 520 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32980UTG at 740 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32980UTG mean?
Suffix reading on 32980UTG: 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.