02476-02420 bearing: complete specifications & equivalents
The 02476-02420 is a ANSI ABMA 19.2 radial bearing sized 31.75 x 68.262 x 22.225 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 31.75 mm |
| Outer diameter D | 68.262 mm |
| Width B | 22.225 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 63 kN |
| Basic static load rating C0 | 67 kN |
| Limiting speed (mechanical) | 5800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 384 g |
| Manufacturer designation | NTN 4T-02476/02420 |
| 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 | 1.25 in |
|---|---|
| Outer diameter D | 2.687 in |
| Width B | 0.875 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 18.3 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) | 32 of 148 |
| Bore above smallest 4t-inch-series size | 19.05 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 02476 | 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 02476-02420 model number is decoded
4T-02476/02420 is the NTN 4T catalogue entry for a 31.75×68.262×22.225 mm inch tapered roller bearing — an ABMA-dimensioned cone/cup set, not an ISO 355 metric bearing, even though the table quotes metric equivalents. Cone and cup of 4T-02476/02420 are separately stocked parts: a worn 02420 cup can be replaced against the existing 02476 cone, provided the new cup carries the identical reference — pairing across references changes the 22.225 mm assembled width and the rating. The 2.0 kN of dynamic capacity per millimetre of bore summarises the 63 kN rating over the 31.75 mm bore — sanity-check any interchange candidate against this ratio and the 22.225 mm T. The printed 63/67 kN ratings belong to the assembled 02476+02420 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. The rollers run with their large ends against the cone's guide rib; lubricant must reach that rib face of 4T-02476/02420, not only the raceway, or the pair smears on the first overloaded start.
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
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- 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
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- indentation of the raceways by hard particles in an open, unsealed arrangement
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 31.75 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-02476/02420.
- The pure-numeric inch family at 31.75 mm bore (68.262×22.225 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 02476/02420 reference at purchase.
- Grease packs must leave free volume inside the 22.225 mm-wide set; over-greasing a pair churning near the oil-band speed of 7,700 r/min raises temperature and destroys the setting.
- Fit selection follows the rotating ring: a rotating cone on a 31.75 mm shaft takes a k5/m5 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
- Open 4T-02476/02420 sets have no seals: a hub or gearbox needs external sealing or the 5,800 r/min grease figure is meaningless once water reaches the cone rib.
- The 63/67 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-02476/02420; 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-02476/02420?
4T-02476/02420 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 31.75 mm bore (1.25 in), 68.262 mm outside diameter and 22.225 mm assembled width T (2.687 × 0.875 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 63 kN, C0 67 kN, grease limiting speed 5,800 r/min, oil speed 7,700 r/min, mass about 384 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-02476/02420 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 02476 cone or the 02420 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 63/67 kN ratings change with the cup.
What is the difference between 4T-02476/02420 and a metric ISO 355 tapered bearing?
4T-02476/02420 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 31.75×68.262×22.225 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-02476/02420 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 02476/02420 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-02476/02420 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-02476/02420 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.