97500-97900 bearing: complete specifications & equivalents
The 97500-97900 is a ANSI ABMA 19.2 radial bearing sized 127 x 228.6 x 53.975 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 127 mm |
| Outer diameter D | 228.6 mm |
| Width B | 53.975 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 355 kN |
| Basic static load rating C0 | 445 kN |
| Limiting speed (mechanical) | 1400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 8430 g |
| Manufacturer designation | NTN 4T-97500/97900 |
| Standard | ANSI ABMA 19.2 |
| Catalog version | NTN 2203E 2026-09-25 |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN 2203E 2026-09-25) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN 2203E 2026-09-25); 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 & 4t-inch-series range
| Bore d | 5 in |
|---|---|
| Outer diameter D | 9 in |
| Width B | 2.125 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 50.8 mm |
| Smallest bore in 4t-inch-series | 12.7 mm |
| Largest outer diameter in 4t-inch-series | 260 mm |
| Width range across 4t-inch-series | 10.998–77.788 mm |
| Bore position in 4t-inch-series (smallest first) | 133 of 148 |
| Bore above smallest 4t-inch-series size | 114.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 97500 | 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 97500-97900 model number is decoded
The NTN 2203E inch table prints 4T-97500/97900 at 127 mm bore (5 in), 228.6 mm cup OD and 53.975 mm assembled T, with a grease limiting speed of 1,400 r/min and an oil ceiling of 1,900 r/min. Letter prefixes inherited from the inch convention mark the load family: LM reads as light-medium, HM as heavy-medium, LL as extra-light, J-prefixed codes as metric-envelope families — 97500 sits in the pure-numeric inch family. Contact-angle geometry of the pure-numeric inch family gives 4T-97500/97900 its radial/axial load split — at 355/445 kN the static rating is about 1.25× C, typical of inch tapered sets proportioned for combined duty. Cup-side note for 97900: within the pure-numeric inch family tables the 97500 cone is listed against several cup options, and it is the cup that fixes the 228.6 mm OD and the 53.975 mm assembled width — quote the full 97500/97900 pair, never the cone alone. Fillet radii must clear the chamfers of the 97500 cone and 97900 cup; undercut shoulders seat the rings fully instead of bridging on a radius.
Typical equipment & failure modes
Common applications
- heavy press and forging-machine drive shafts
- port-crane travel and hoist gearboxes
- cement-plant mill and kiln drive trains
- large shredder and recycler main shafts
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- flaking on one cone only when a bent shaft loads the O/X pair unevenly
- cup creep and housing fretting when the cup seat is cut too loose for the rotating load
- cage fatigue when the pair runs continuously near the grease limiting speed without oil cooling
- rolling-contact fatigue spalling after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- At 127 mm bore the 4T-97500/97900 set is adjusted with hydraulic nuts or measured shims on mill and crane positions; manual torque methods cannot control preload at the 355 kN C level.
- The pure-numeric inch family at 127 mm bore (228.6×53.975 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 97500/97900 reference at purchase.
- Open 4T-97500/97900 sets have no seals: a hub or gearbox needs external sealing or the 1,400 r/min grease figure is meaningless once water reaches the cone rib.
- Shaft and housing fillets must clear the ring chamfers of 97500 and 97900; use undercut shoulders so the rings seat on the face, not on a radius.
- Open 4T-97500/97900 sets have no seals: a hub or gearbox needs external sealing or the 1,400 r/min grease figure is meaningless once water reaches the cone rib.
- The 355/445 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-97500/97900; internal geometry legitimately differs between inch-series makers, so re-verify ratings, adjustment and the exact cone/cup references before substituting another brand on a rated drive.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 4T-97500/97900?
4T-97500/97900 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 127 mm bore (5 in), 228.6 mm outside diameter and 53.975 mm assembled width T (9 × 2.125 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 355 kN, C0 445 kN, grease limiting speed 1,400 r/min, oil speed 1,900 r/min, mass about 8430 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-97500/97900 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 97500 cone or the 97900 cup can be replaced by an identical reference from NTN or another ABMA-dimensioned maker. Pairing the cone with a different cup reference is a different catalogue row: OD, assembled T and the 355/445 kN ratings change with the cup.
What is the difference between 4T-97500/97900 and a metric ISO 355 tapered bearing?
4T-97500/97900 follows the ABMA inch boundary plan with cone/cup references; ISO 355 bearings use metric dimension-series numbers (302, 322, …). Even where a metric size looks close to 127×228.6×53.975 mm, the envelopes and contact angles differ — the two systems are not drop-in interchangeable; check every boundary value before substituting.
What does the 4T prefix on 4T-97500/97900 mean?
4T is NTN's tapered roller bearing quality mark, stamped on cone and cup in the factory. It identifies NTN's 4T programme and is not a dimension or variant code, so interchange lists quote the bare 97500/97900 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-97500/97900 list two speeds, 1,400 and 1,900 r/min?
The lower figure, 1,400 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 4T-97500/97900 at 1,900 r/min because oil removes rib-contact heat better. Real limits still depend on pair adjustment, oil flow and cooling.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN 2203E 2026-09-25 on 2026-10-01. Read our editorial & correction policy.