02475-02420 bearing: complete specifications & equivalents
The 02475-02420 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 | 382 g |
| Manufacturer designation | NTN 4T-02475/02420 |
| 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 |
|---|---|---|---|
| 02475 | 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 02475-02420 model number is decoded
The NTN 2203E inch table prints 4T-02475/02420 at 31.75 mm bore (1.25 in), 68.262 mm cup OD and 22.225 mm assembled T, with a grease limiting speed of 5,800 r/min and an oil ceiling of 7,700 r/min. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: 02475 identifies the cone of 31.75 mm (1.25 in) bore by catalogue lookup, and 02420 fixes the 68.262 mm OD. Catalogue mass of the 4T-02475/02420 cone-plus-cup set is 382 g; shaft and housing shoulders must carry that mass square to the axis during fitting. Housing fitment sequence for 4T-02475/02420: press the 02420 cup square into the 68.262 mm seat first, then bring the 02475 cone (on its 31.75 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. Minimum load matters at speed: an unloaded 4T-02475/02420 run near 5,800 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
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- 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
- edge loading when shaft deflection exceeds the few arc-minutes an adjusted pair tolerates
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-02475/02420.
- 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 02475/02420 reference at purchase.
- Never drive the 68.262 mm cup home through the rollers: fitting force goes through the ring faces only, or brinell marks release as noise within the first running hours.
- Shaft and housing fillets must clear the ring chamfers of 02475 and 02420; use undercut shoulders so the rings seat on the face, not on a radius.
- 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.
- The 63/67 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-02475/02420; 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-02475/02420?
4T-02475/02420 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 382 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-02475/02420 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 02475 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-02475/02420 and a metric ISO 355 tapered bearing?
4T-02475/02420 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-02475/02420 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 02475/02420 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-02475/02420 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-02475/02420 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.