47890-47820-NTN bearing: complete specifications & equivalents
The 47890-47820-NTN is a ANSI ABMA 19.2 radial bearing sized 92.075 x 146.05 x 33.338 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 92.075 mm |
| Outer diameter D | 146.05 mm |
| Width B | 33.338 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 | 266 kN |
| Limiting speed (mechanical) | 2400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2080 g |
| Manufacturer designation | NTN 4T-47890/47820 |
| 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 | 3.625 in |
|---|---|
| Outer diameter D | 5.75 in |
| Width B | 1.313 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 27 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) | 110 of 148 |
| Bore above smallest 4t-inch-series size | 79.375 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 47890-47820 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 92.075×146.05×33.338 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 47890-47820-NTN model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the order number 4T-47890/47820 denotes the pure-numeric inch family of NTN inch tapered roller bearings — cone 47890 and cup 47820 delivered as a matched, separable pair of 92.075 mm bore and 146.05 mm outside diameter. The 4T prefix is NTN's tapered roller quality mark stamped on both parts; it is a brand mark, not a size code, so cross-references quote 47890/47820 without it. The 2.0 kN of dynamic capacity per millimetre of bore summarises the 181 kN rating over the 92.075 mm bore — sanity-check any interchange candidate against this ratio and the 33.338 mm T. The printed 181/266 kN ratings belong to the assembled 47890+47820 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. NTN grades inch 4T bearings as open bearings without integral seals; at 92.075 mm bore the application supplies sealing and the grease fill or oil feed.
Typical equipment & failure modes
Common applications
- crusher and screening-plant eccentric shafts
- heavy truck and bus drive-axle differentials
- plant gearboxes on inch-dimensioned shaft lines
- large conveyor head pulleys in bulk-handling plant
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
- indentation of the raceways by hard particles in an open, unsealed arrangement
Selection pitfalls — read before you substitute
- Mount the 92.075 mm cone by induction heating (max 120 °C) and the 146.05 mm cup with a press sleeve; at 2080 g a cocked ring brinells the raceway directly.
- The pure-numeric inch family at 92.075 mm bore (146.05×33.338 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full 47890/47820 reference at purchase.
- Do not confuse T (33.338 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 (33.338 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- Never drive the 146.05 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.
- The 181/266 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-47890/47820; 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-47890/47820?
4T-47890/47820 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 92.075 mm bore (3.625 in), 146.05 mm outside diameter and 33.338 mm assembled width T (5.75 × 1.313 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 181 kN, C0 266 kN, grease limiting speed 2,400 r/min, oil speed 3,100 r/min, mass about 2080 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-47890/47820 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the 47890 cone or the 47820 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 181/266 kN ratings change with the cup.
What is the difference between 4T-47890/47820 and a metric ISO 355 tapered bearing?
4T-47890/47820 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 92.075×146.05×33.338 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-47890/47820 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 47890/47820 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-47890/47820 list two speeds, 2,400 and 3,100 r/min?
The lower figure, 2,400 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-47890/47820 at 3,100 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.