J90354-J90748 bearing: complete specifications & equivalents
The J90354-J90748 is a ANSI ABMA 19.2 radial bearing sized 90 x 190 x 50.8 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 90 mm |
| Outer diameter D | 190 mm |
| Width B | 50.8 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 310 kN |
| Basic static load rating C0 | 365 kN |
| Limiting speed (mechanical) | 1800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 6320 g |
| Manufacturer designation | NTN 4T-J90354/J90748 |
| 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 | 3.543 in |
|---|---|
| Outer diameter D | 7.48 in |
| Width B | 2 in |
| ISO bore code | 54 |
| Radial section height (D−d)/2 | 50 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) | 108 of 148 |
| Bore above smallest 4t-inch-series size | 77.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| J90354 | 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 J90354-J90748 model number is decoded
NTN supplies this 3.543 in (90 mm) shaft position as 4T-J90354/J90748: cone J90354, cup J90748, profiled rollers and a pressed-steel cage, rated 310 kN basic dynamic and 365 kN static. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: J90354 identifies the cone of 90 mm (3.543 in) bore by catalogue lookup, and J90748 fixes the 190 mm OD. Selection: C 310 kN against C0 365 kN gives a C0/C ratio of 1.18 for the 90 mm bore; the pair is counted as one adjusted unit when checking L10 at the equivalent combined load. Cup-side note for J90748: within the J prefixed family tables the J90354 cone is listed against several cup options, and it is the cup that fixes the 190 mm OD and the 50.8 mm assembled width — quote the full J90354/J90748 pair, never the cone alone. Contact-pattern check with marking blue: a pattern biased to one roller end means the 90 mm pair is misadjusted and the set will edge-load in service.
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
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- 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
- cage damage from a mounting blow transmitted through the roller complement
- rolling-contact fatigue spalling after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- Mount the 90 mm cone by induction heating (max 120 °C) and the 190 mm cup with a press sleeve; at 6320 g a cocked ring brinells the raceway directly.
- The J-prefixed J90354 code belongs to a metric-envelope inch family: its 90 mm bore is a round metric figure, yet the part still follows ABMA cone/cup numbering — do not substitute an ISO 355 metric 302/322 bearing of the same bore without checking OD, T and contact angle.
- Inch and metric bores collide on paper — 90 mm is 3.543 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- Replacing one half of an adjusted pair without resetting end play negates the 50.8 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- Quote the full J90354/J90748 pair at ordering: the J90354 cone also ships against sibling cups, and a cup from another reference changes the 50.8 mm assembled width and the rating.
- The 310/365 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-J90354/J90748; 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-J90354/J90748?
4T-J90354/J90748 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 90 mm bore (3.543 in), 190 mm outside diameter and 50.8 mm assembled width T (7.48 × 2 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 310 kN, C0 365 kN, grease limiting speed 1,800 r/min, oil speed 2,400 r/min, mass about 6320 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-J90354/J90748 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the J90354 cone or the J90748 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 310/365 kN ratings change with the cup.
What is the difference between 4T-J90354/J90748 and a metric ISO 355 tapered bearing?
4T-J90354/J90748 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 90×190×50.8 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-J90354/J90748 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 J90354/J90748 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-J90354/J90748 list two speeds, 1,800 and 2,400 r/min?
The lower figure, 1,800 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-J90354/J90748 at 2,400 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.