41125-41286 bearing: complete specifications & equivalents
The 41125-41286 is a ANSI ABMA 19.2 radial bearing sized 28.575 x 72.626 x 24.608 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 28.575 mm |
| Outer diameter D | 72.626 mm |
| Width B | 24.608 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 64.5 kN |
| Basic static load rating C0 | 55.5 kN |
| Limiting speed (mechanical) | 5800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 475 g |
| Manufacturer designation | NTN 4T-41125/41286 |
| 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 | 1.125 in |
|---|---|
| Outer diameter D | 2.859 in |
| Width B | 0.969 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 22 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) | 23 of 148 |
| Bore above smallest 4t-inch-series size | 15.875 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 41125 | 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 41125-41286 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the order number 4T-41125/41286 denotes the pure-numeric inch family of NTN inch tapered roller bearings — cone 41125 and cup 41286 delivered as a matched, separable pair of 28.575 mm bore and 72.626 mm outside diameter. 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 — 41125 sits in the pure-numeric inch family. Speed planning uses both catalogue columns: grease 5,800 r/min is the mechanical ceiling for 4T-41125/41286, oil 7,700 r/min with circulating oil — a 1,900 r/min margin at this size. Cup-side note for 41286: within the pure-numeric inch family tables the 41125 cone is listed against several cup options, and it is the cup that fixes the 72.626 mm OD and the 24.608 mm assembled width — quote the full 41125/41286 pair, never the cone alone. Minimum load matters at speed: an unloaded 4T-41125/41286 run near 5,800 r/min lets the rollers skid; lightly spring-preload high-speed pair arrangements.
Typical equipment & failure modes
Common applications
- truck and trailer axle hubs on inch-dimensioned axles
- agricultural tractor transmission and PTO shafts
- industrial gearboxes built to inch shafting
- construction-equipment pivot and wheel positions
Known failure patterns
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- preload loss and noise after one bearing of the adjusted pair is replaced without resetting end play
- false brinelling on a stationary pair exposed to vibration during transport or standby
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- 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 28.575 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-41125/41286.
- The pure-numeric inch family at 28.575 mm bore (72.626×24.608 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 41125/41286 reference at purchase.
- Quote the full 41125/41286 pair at ordering: the 41125 cone also ships against sibling cups, and a cup from another reference changes the 24.608 mm assembled width and the rating.
- ABMA makes the 28.575×72.626 mm envelope interchangeable, not the ratings: NTN prints 64.5/55.5 kN for this execution and another make of the same number can differ in roller complement.
- Shaft and housing fillets must clear the ring chamfers of 41125 and 41286; use undercut shoulders so the rings seat on the face, not on a radius.
- The 64.5/55.5 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-41125/41286; 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-41125/41286?
4T-41125/41286 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 28.575 mm bore (1.125 in), 72.626 mm outside diameter and 24.608 mm assembled width T (2.859 × 0.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 64.5 kN, C0 55.5 kN, grease limiting speed 5,800 r/min, oil speed 7,700 r/min, mass about 475 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-41125/41286 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 41125 cone or the 41286 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 64.5/55.5 kN ratings change with the cup.
What is the difference between 4T-41125/41286 and a metric ISO 355 tapered bearing?
4T-41125/41286 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 28.575×72.626×24.608 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-41125/41286 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 41125/41286 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-41125/41286 list two speeds, 5,800 and 7,700 r/min?
The lower figure, 5,800 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-41125/41286 at 7,700 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.