JLM506849-JLM506810 bearing: complete specifications & equivalents
The JLM506849-JLM506810 is a ANSI ABMA 19.2 radial bearing sized 55 x 90 x 23 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 55 mm |
| Outer diameter D | 90 mm |
| Width B | 23 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 86 kN |
| Basic static load rating C0 | 109 kN |
| Limiting speed (mechanical) | 3900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 556 g |
| Manufacturer designation | NTN 4T-JLM506849/JLM506810 |
| 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 | 2.165 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 0.906 in |
| ISO bore code | 49 |
| Radial section height (D−d)/2 | 17.5 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) | 69 of 148 |
| Bore above smallest 4t-inch-series size | 42.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| JLM506849 | 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 JLM506849-JLM506810 model number is decoded
4T-JLM506849/JLM506810 is an NTN inch-series single-row tapered roller bearing: a separable cone-and-cup pair on the ABMA inch boundary plan, 55×90×23 mm (assembled width T), for a shaft of about 55 mm (2.165 in). Reading the designation: 4T-JLM506849/JLM506810 follows the ABMA inch convention — the number before the slash is the cone (inner ring with roller set and cage), the number after the slash is the cup (outer ring), and the JLM prefixed family lettering ties the pair to its boundary plan. Imperial cross-check for the drawing: 55×90×23 mm converts to 2.165 × 3.543 × 0.906 in; the ABMA envelope swaps with like-numbered inch parts but the 86/109 kN ratings are NTN-specific. Cup-side note for JLM506810: within the JLM prefixed family tables the JLM506849 cone is listed against several cup options, and it is the cup that fixes the 90 mm OD and the 23 mm assembled width — quote the full JLM506849/JLM506810 pair, never the cone alone. With a rotating shaft a k5/m5 cone seat and an easy-push cup seat are typical practice for 4T-JLM506849/JLM506810; reverse the fit logic when the cup rotates.
Typical equipment & failure modes
Common applications
- industrial gearboxes built to inch shafting
- construction-equipment pivot and wheel positions
- mining and quarry conveyor drive pulleys
- machine-tool headstocks on inch spindles
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- 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
- rolling-contact fatigue spalling after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 55 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-JLM506849/JLM506810.
- The J-prefixed JLM506849 code belongs to a metric-envelope inch family: its 55 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.
- Quote the full JLM506849/JLM506810 pair at ordering: the JLM506849 cone also ships against sibling cups, and a cup from another reference changes the 23 mm assembled width and the rating.
- ABMA makes the 55×90 mm envelope interchangeable, not the ratings: NTN prints 86/109 kN for this execution and another make of the same number can differ in roller complement.
- Replacing one half of an adjusted pair without resetting end play negates the 23 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 86/109 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-JLM506849/JLM506810; 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-JLM506849/JLM506810?
4T-JLM506849/JLM506810 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 55 mm bore (2.165 in), 90 mm outside diameter and 23 mm assembled width T (3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 86 kN, C0 109 kN, grease limiting speed 3,900 r/min, oil speed 5,300 r/min, mass about 556 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-JLM506849/JLM506810 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the JLM506849 cone or the JLM506810 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 86/109 kN ratings change with the cup.
What is the difference between 4T-JLM506849/JLM506810 and a metric ISO 355 tapered bearing?
4T-JLM506849/JLM506810 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 55×90×23 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-JLM506849/JLM506810 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 JLM506849/JLM506810 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-JLM506849/JLM506810 list two speeds, 3,900 and 5,300 r/min?
The lower figure, 3,900 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-JLM506849/JLM506810 at 5,300 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.