32984UTG bearing: complete specifications & equivalents
The 32984UTG is a ISO 355 radial bearing sized 420 x 560 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 | 420 mm |
| Outer diameter D | 560 mm |
| Width B | 87 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1570 kN |
| Basic static load rating C0 | 2840 kN |
| Fatigue load limit Pu | 215 kN |
| Limiting speed (mechanical) | 490 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 56200 g |
| Manufacturer designation | NTN 32984UTG |
| 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 | 16.535 in |
|---|---|
| Outer diameter D | 22.047 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) | 36 of 37 |
| Bore above smallest 32900-series size | 385 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32984UTG | 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 32984UTG model number is decoded
32984UTG 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 420×560 mm ISO 355 envelope, with 87 mm overall assembled width T. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32984UTG by the metric ISO 355 number: 420 mm bore, 560 mm OD. Individually mounted, 32984UTG takes axial force in one direction only; two bearings are arranged face-to-face (X) or back-to-back (O) according to the moment stiffness and misalignment the shaft requires. The fatigue load limit Pu printed for 32984UTG is 215 kN; in the adjusted-life equation that is the equivalent-load floor below which high reliability is expected even under contamination. Mount the 420 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 32984UTG.
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
- 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
- brinell marks on cone and cup raceways from impact during handling or hammering during fitting
Selection pitfalls — read before you substitute
- At 420 mm bore the 32984UTG 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 1570 kN C level.
- The thin 87 mm section of 32984UTG is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 420 mm bore smears the roller ends against the rib.
- Do not confuse T (87 mm assembled width of cone + cup) with the cone width when drawing spacers; an abutment sized to T instead of the ring width leaves the cup unseated.
- Open 32984UTG units have no seals: a wheel-hub or gearbox application needs external sealing or the 490 r/min grease figure is meaningless once water reaches the cone rib.
- Never fit the 420 mm cone by hammering the 560 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
- The 1570/2840 kN ratings and 215 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32984UTG; 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 32984UTG?
32984UTG is a metric 4T tapered roller bearing to ISO 355: 420 mm bore, 560 mm outside diameter and 87 mm assembled width T (16.535 × 22.047 × 3.425 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1570 kN, C0 2840 kN, Pu 215 kN, grease limiting speed 490 r/min, oil speed 700 r/min, mass about 56200 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32984UTG?
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 (32984UTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32984UTG designation encode the 420 mm bore?
last two digits 84 are the ISO bore code, ×5 = 420 mm (codes 00–03 use the 10/12/15/17 exception table). The 560 mm OD and 87 mm assembled T follow the ISO 355 dimension-series plan.
Why does 32984UTG list two speeds, 490 and 700 r/min?
The lower figure, 490 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32984UTG at 700 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32984UTG mean?
Suffix reading on 32984UTG: 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.