566-563-NTN bearing: complete specifications & equivalents
The 566-563-NTN is a ANSI ABMA 19.2 radial bearing sized 69.85 x 127 x 36.512 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 69.85 mm |
| Outer diameter D | 127 mm |
| Width B | 36.512 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 181 kN |
| Basic static load rating C0 | 229 kN |
| Limiting speed (mechanical) | 2900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1910 g |
| Manufacturer designation | NTN 4T-566/563 |
| 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 | 2.75 in |
|---|---|
| Outer diameter D | 5 in |
| Width B | 1.437 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 28.6 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) | 86 of 148 |
| Bore above smallest 4t-inch-series size | 57.14999999999999 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 566-563 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 69.85×127×36.512 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application 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 566-563-NTN model number is decoded
The NTN 2203E inch table prints 4T-566/563 at 69.85 mm bore (2.75 in), 127 mm cup OD and 36.512 mm assembled T, with a grease limiting speed of 2,900 r/min and an oil ceiling of 3,800 r/min. Cone and cup of 4T-566/563 are separately stocked parts: a worn 563 cup can be replaced against the existing 566 cone, provided the new cup carries the identical reference — pairing across references changes the 36.512 mm assembled width and the rating. The 2.6 kN of dynamic capacity per millimetre of bore summarises the 181 kN rating over the 69.85 mm bore — sanity-check any interchange candidate against this ratio and the 36.512 mm T. Housing fitment sequence for 4T-566/563: press the 563 cup square into the 127 mm seat first, then bring the 566 cone (on its 69.85 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. A single-row tapered bearing reacts thrust in one direction only; 4T-566/563 is adjusted against a second bearing so the shaft is located in both directions.
Typical equipment & failure modes
Common applications
- large conveyor head pulleys in bulk-handling plant
- paper-machine and calender roll supports
- off-highway and forestry machine axles
- marine winch and deck-machinery shafts
Known failure patterns
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- false brinelling on a stationary pair exposed to vibration during transport or standby
- preload loss and noise after one bearing of the adjusted pair is replaced without resetting end play
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- Mount the 69.85 mm cone by induction heating (max 120 °C) and the 127 mm cup with a press sleeve; at 1910 g a cocked ring brinells the raceway directly.
- The pure-numeric inch family at 69.85 mm bore (127×36.512 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 566/563 reference at purchase.
- ABMA makes the 69.85×127 mm envelope interchangeable, not the ratings: NTN prints 181/229 kN for this execution and another make of the same number can differ in roller complement.
- Quote the full 566/563 pair at ordering: the 566 cone also ships against sibling cups, and a cup from another reference changes the 36.512 mm assembled width and the rating.
- Quote the full 566/563 pair at ordering: the 566 cone also ships against sibling cups, and a cup from another reference changes the 36.512 mm assembled width and the rating.
- The 181/229 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-566/563; 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-566/563?
4T-566/563 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 69.85 mm bore (2.75 in), 127 mm outside diameter and 36.512 mm assembled width T (5 × 1.437 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 181 kN, C0 229 kN, grease limiting speed 2,900 r/min, oil speed 3,800 r/min, mass about 1910 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-566/563 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 566 cone or the 563 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 181/229 kN ratings change with the cup.
What is the difference between 4T-566/563 and a metric ISO 355 tapered bearing?
4T-566/563 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 69.85×127×36.512 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-566/563 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 566/563 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-566/563 list two speeds, 2,900 and 3,800 r/min?
The lower figure, 2,900 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-566/563 at 3,800 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.