M84548-M84510 bearing: complete specifications & equivalents
The M84548-M84510 is a ANSI ABMA 19.2 radial bearing sized 25.4 x 57.15 x 19.431 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 25.4 mm |
| Outer diameter D | 57.15 mm |
| Width B | 19.431 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 47 kN |
| Basic static load rating C0 | 48.5 kN |
| Limiting speed (mechanical) | 6900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 244 g |
| Manufacturer designation | NTN 4T-M84548/M84510 |
| 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 | 1 in |
|---|---|
| Outer diameter D | 2.25 in |
| Width B | 0.765 in |
| ISO bore code | 48 |
| Radial section height (D−d)/2 | 15.9 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) | 19 of 148 |
| Bore above smallest 4t-inch-series size | 12.7 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| M84548-510 | SKF | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per 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 M84548-M84510 model number is decoded
NTN supplies this 1 in (25.4 mm) shaft position as 4T-M84548/M84510: cone M84548, cup M84510, profiled rollers and a pressed-steel cage, rated 47 kN basic dynamic and 48.5 kN static. Cone and cup of 4T-M84548/M84510 are separately stocked parts: a worn M84510 cup can be replaced against the existing M84548 cone, provided the new cup carries the identical reference — pairing across references changes the 19.431 mm assembled width and the rating. Catalogue mass of the 4T-M84548/M84510 cone-plus-cup set is 244 g; shaft and housing shoulders must carry that mass square to the axis during fitting. Cup-side note for M84510: within the medium M family tables the M84548 cone is listed against several cup options, and it is the cup that fixes the 57.15 mm OD and the 19.431 mm assembled width — quote the full M84548/M84510 pair, never the cone alone. Running clearance of 4T-M84548/M84510 is set at mounting by axial displacement of cone or cup — the catalogue does not ship a preloaded set, so the drawing must state end play or preload.
Typical equipment & failure modes
Common applications
- mining and quarry conveyor drive pulleys
- machine-tool headstocks on inch spindles
- pump and blower drive shafts with combined load
- truck and trailer axle hubs on inch-dimensioned axles
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- cup creep and housing fretting when the cup seat is cut too loose for the rotating load
- flaking on one cone only when a bent shaft loads the O/X pair unevenly
- cage damage from a mounting blow transmitted through the roller complement
- rolling-contact fatigue spalling after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 25.4 mm class are adjusted in pairs; verify end play against the axle or gearbox drawing and re-torque after bedding-in instead of trusting the first setting on 4T-M84548/M84510.
- The medium M family at 25.4 mm bore (57.15×19.431 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full M84548/M84510 reference at purchase.
- Replacing one half of an adjusted pair without resetting end play negates the 19.431 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- Open 4T-M84548/M84510 sets have no seals: a hub or gearbox needs external sealing or the 6,900 r/min grease figure is meaningless once water reaches the cone rib.
- ABMA makes the 25.4×57.15 mm envelope interchangeable, not the ratings: NTN prints 47/48.5 kN for this execution and another make of the same number can differ in roller complement.
- The 47/48.5 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-M84548/M84510; 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-M84548/M84510?
4T-M84548/M84510 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 25.4 mm bore (1 in), 57.15 mm outside diameter and 19.431 mm assembled width T (2.25 × 0.765 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 47 kN, C0 48.5 kN, grease limiting speed 6,900 r/min, oil speed 9,200 r/min, mass about 244 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-M84548/M84510 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the M84548 cone or the M84510 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 47/48.5 kN ratings change with the cup.
What is the difference between 4T-M84548/M84510 and a metric ISO 355 tapered bearing?
4T-M84548/M84510 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 25.4×57.15×19.431 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-M84548/M84510 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 M84548/M84510 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-M84548/M84510 list two speeds, 6,900 and 9,200 r/min?
The lower figure, 6,900 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-M84548/M84510 at 9,200 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.