25590-25519 bearing: complete specifications & equivalents
The 25590-25519 is a ANSI ABMA 19.2 radial bearing sized 45.618 x 82.55 x 23.812 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 45.618 mm |
| Outer diameter D | 82.55 mm |
| Width B | 23.812 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 84.5 kN |
| Basic static load rating C0 | 98 kN |
| Limiting speed (mechanical) | 4500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 534 g |
| Manufacturer designation | NTN 4T-25590/25519 |
| 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 | 1.796 in |
|---|---|
| Outer diameter D | 3.25 in |
| Width B | 0.937 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 18.5 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) | 56 of 148 |
| Bore above smallest 4t-inch-series size | 32.918000000000006 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 25590-25520-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN cone 4T-25590 paired with a different cup (25520): cone interchangeable, cup differs — OD, assembled width T and ratings follow the cup. Verify the full cone/cup reference before substituting. |
| 25590-25522-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN cone 4T-25590 paired with a different cup (25522): cone interchangeable, cup differs — OD, assembled width T and ratings follow the cup. Verify the full cone/cup reference before substituting. |
| 25590-25526 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN cone 4T-25590 paired with a different cup (25526): cone interchangeable, cup differs — OD, assembled width T and ratings follow the cup. Verify the full cone/cup reference before substituting. |
| 25590-25520 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45.618×82.55×23.812 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 25590-25522 | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue. |
| 25590-25523 | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue. |
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 25590-25519 model number is decoded
4T-25590/25519 belongs to the NTN inch 4T tapered roller range (pure-numeric inch family); cone and cup are ordered by their own references and are individually interchangeable with like-numbered parts. 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 — 25590 sits in the pure-numeric inch family. Selection: C 84.5 kN against C0 98 kN gives a C0/C ratio of 1.16 for the 45.618 mm bore; the pair is counted as one adjusted unit when checking L10 at the equivalent combined load. The printed 84.5/98 kN ratings belong to the assembled 25590+25519 pair; a sibling row using the same cone with a different cup carries its own rating row because the raceway track shifts with the cup. Minimum load matters at speed: an unloaded 4T-25590/25519 run near 4,500 r/min lets the rollers skid; lightly spring-preload high-speed pair arrangements.
Typical equipment & failure modes
Common applications
- construction-equipment pivot and wheel positions
- mining and quarry conveyor drive pulleys
- machine-tool headstocks on inch spindles
- pump and blower drive shafts with combined load
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- 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
- cage damage from a mounting blow transmitted through the roller complement
- water-induced pitting when the open bearing sees washdown without external seals
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 45.618 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-25590/25519.
- The pure-numeric inch family at 45.618 mm bore (82.55×23.812 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 25590/25519 reference at purchase.
- An unloaded 4T-25590/25519 near 4,500 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded high-speed pairs.
- Do not confuse T (23.812 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- Replacing one half of an adjusted pair without resetting end play negates the 23.812 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 84.5/98 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-25590/25519; 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-25590/25519?
4T-25590/25519 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 45.618 mm bore (1.796 in), 82.55 mm outside diameter and 23.812 mm assembled width T (3.25 × 0.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 84.5 kN, C0 98 kN, grease limiting speed 4,500 r/min, oil speed 6,000 r/min, mass about 534 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-25590/25519 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 25590 cone or the 25519 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 84.5/98 kN ratings change with the cup.
What is the difference between 4T-25590/25519 and a metric ISO 355 tapered bearing?
4T-25590/25519 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 45.618×82.55×23.812 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-25590/25519 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 25590/25519 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-25590/25519 list two speeds, 4,500 and 6,000 r/min?
The lower figure, 4,500 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-25590/25519 at 6,000 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.