15590-15520 bearing: complete specifications & equivalents
The 15590-15520 is a ANSI ABMA 19.2 radial bearing sized 28.575 x 57.15 x 17.462 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 | 57.15 mm |
| Width B | 17.462 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 44 kN |
| Basic static load rating C0 | 45.5 kN |
| Limiting speed (mechanical) | 6700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 197 g |
| Manufacturer designation | NTN 4T-15590/15520 |
| 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 | 2.25 in |
| Width B | 0.687 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 14.3 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 |
|---|---|---|---|
| 15590-15523 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN cone 4T-15590 paired with a different cup (15523): cone interchangeable, cup differs — OD, assembled width T and ratings follow the cup. Verify the full cone/cup reference before substituting. |
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 15590-15520 model number is decoded
4T-15590/15520 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 — 15590 sits in the pure-numeric inch family. Selection: C 44 kN against C0 45.5 kN gives a C0/C ratio of 1.03 for the 28.575 mm bore; the pair is counted as one adjusted unit when checking L10 at the equivalent combined load. The printed 44/45.5 kN ratings belong to the assembled 15590+15520 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. Contact-pattern check with marking blue: a pattern biased to one roller end means the 28.575 mm pair is misadjusted and the set will edge-load in service.
Typical equipment & failure modes
Common applications
- pump and blower drive shafts with combined load
- truck and trailer axle hubs on inch-dimensioned axles
- agricultural tractor transmission and PTO shafts
- industrial gearboxes built to inch shafting
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 fatigue when the pair runs continuously near the grease limiting speed without oil cooling
- indentation of the raceways by hard particles in an open, unsealed arrangement
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-15590/15520.
- The pure-numeric inch family at 28.575 mm bore (57.15×17.462 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 15590/15520 reference at purchase.
- Do not confuse T (17.462 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- Do not confuse T (17.462 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- ABMA makes the 28.575×57.15 mm envelope interchangeable, not the ratings: NTN prints 44/45.5 kN for this execution and another make of the same number can differ in roller complement.
- The 44/45.5 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-15590/15520; 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-15590/15520?
4T-15590/15520 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 28.575 mm bore (1.125 in), 57.15 mm outside diameter and 17.462 mm assembled width T (2.25 × 0.687 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 44 kN, C0 45.5 kN, grease limiting speed 6,700 r/min, oil speed 8,900 r/min, mass about 197 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-15590/15520 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 15590 cone or the 15520 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 44/45.5 kN ratings change with the cup.
What is the difference between 4T-15590/15520 and a metric ISO 355 tapered bearing?
4T-15590/15520 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 28.575×57.15×17.462 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-15590/15520 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 15590/15520 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-15590/15520 list two speeds, 6,700 and 8,900 r/min?
The lower figure, 6,700 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-15590/15520 at 8,900 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.