15580-15523 bearing: complete specifications & equivalents
The 15580-15523 is a ANSI ABMA 19.2 radial bearing sized 26.988 x 60.325 x 19.842 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 26.988 mm |
| Outer diameter D | 60.325 mm |
| Width B | 19.842 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 | 261 g |
| Manufacturer designation | NTN 4T-15580/15523 |
| 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 | 1.063 in |
|---|---|
| Outer diameter D | 2.375 in |
| Width B | 0.781 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 16.7 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) | 22 of 148 |
| Bore above smallest 4t-inch-series size | 14.288 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 15580 | 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 15580-15523 model number is decoded
4T-15580/15523 is an NTN inch-series single-row tapered roller bearing: a separable cone-and-cup pair on the ABMA inch boundary plan, 26.988×60.325×19.842 mm (assembled width T), for a shaft of about 26.988 mm (1.063 in). Cone and cup of 4T-15580/15523 are separately stocked parts: a worn 15523 cup can be replaced against the existing 15580 cone, provided the new cup carries the identical reference — pairing across references changes the 19.842 mm assembled width and the rating. Imperial cross-check for the drawing: 26.988×60.325×19.842 mm converts to 1.063 × 2.375 × 0.781 in; the ABMA envelope swaps with like-numbered inch parts but the 44/45.5 kN ratings are NTN-specific. The printed 44/45.5 kN ratings belong to the assembled 15580+15523 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. Fillet radii must clear the chamfers of the 15580 cone and 15523 cup; undercut shoulders seat the rings fully instead of bridging on a radius.
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
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- 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
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- water-induced pitting when the open bearing sees washdown without external seals
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 26.988 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-15580/15523.
- The pure-numeric inch family at 26.988 mm bore (60.325×19.842 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 15580/15523 reference at purchase.
- Shaft and housing fillets must clear the ring chamfers of 15580 and 15523; use undercut shoulders so the rings seat on the face, not on a radius.
- An unloaded 4T-15580/15523 near 6,700 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded high-speed pairs.
- Grease packs must leave free volume inside the 19.842 mm-wide set; over-greasing a pair churning near the oil-band speed of 8,900 r/min raises temperature and destroys the setting.
- The 44/45.5 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-15580/15523; 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-15580/15523?
4T-15580/15523 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 26.988 mm bore (1.063 in), 60.325 mm outside diameter and 19.842 mm assembled width T (2.375 × 0.781 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 261 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-15580/15523 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 15580 cone or the 15523 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-15580/15523 and a metric ISO 355 tapered bearing?
4T-15580/15523 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 26.988×60.325×19.842 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-15580/15523 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 15580/15523 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-15580/15523 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-15580/15523 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.