JLM710949-JLM710910 bearing: complete specifications & equivalents
The JLM710949-JLM710910 is a ANSI ABMA 19.2 radial bearing sized 65 x 105 x 24 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 65 mm |
| Outer diameter D | 105 mm |
| Width B | 24 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 94.5 kN |
| Basic static load rating C0 | 117 kN |
| Limiting speed (mechanical) | 3300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 744 g |
| Manufacturer designation | NTN 4T-JLM710949/JLM710910 |
| 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 | 2.559 in |
|---|---|
| Outer diameter D | 4.134 in |
| Width B | 0.945 in |
| ISO bore code | 49 |
| Radial section height (D−d)/2 | 20 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) | 82 of 148 |
| Bore above smallest 4t-inch-series size | 52.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| JLM710949 | 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 JLM710949-JLM710910 model number is decoded
The NTN 2203E inch table prints 4T-JLM710949/JLM710910 at 65 mm bore (2.559 in), 105 mm cup OD and 24 mm assembled T, with a grease limiting speed of 3,300 r/min and an oil ceiling of 4,500 r/min. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: JLM710949 identifies the cone of 65 mm (2.559 in) bore by catalogue lookup, and JLM710910 fixes the 105 mm OD. Catalogue mass of the 4T-JLM710949/JLM710910 cone-plus-cup set is 744 g; shaft and housing shoulders must carry that mass square to the axis during fitting. Cup-side note for JLM710910: within the JLM prefixed family tables the JLM710949 cone is listed against several cup options, and it is the cup that fixes the 105 mm OD and the 24 mm assembled width — quote the full JLM710949/JLM710910 pair, never the cone alone. Back-to-back (O) and face-to-face (X) arrangements of two 4T-JLM710949/JLM710910 sets react differently to shaft bending; choose the orientation for the moment load before locking shoulder geometry.
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
- 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
- Mount the 65 mm cone by induction heating (max 120 °C) and the 105 mm cup with a press sleeve; at 744 g a cocked ring brinells the raceway directly.
- The J-prefixed JLM710949 code belongs to a metric-envelope inch family: its 65 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.
- Open 4T-JLM710949/JLM710910 sets have no seals: a hub or gearbox needs external sealing or the 3,300 r/min grease figure is meaningless once water reaches the cone rib.
- Replacing one half of an adjusted pair without resetting end play negates the 24 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- Replacing one half of an adjusted pair without resetting end play negates the 24 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 94.5/117 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-JLM710949/JLM710910; 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-JLM710949/JLM710910?
4T-JLM710949/JLM710910 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 65 mm bore (2.559 in), 105 mm outside diameter and 24 mm assembled width T (4.134 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 94.5 kN, C0 117 kN, grease limiting speed 3,300 r/min, oil speed 4,500 r/min, mass about 744 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-JLM710949/JLM710910 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the JLM710949 cone or the JLM710910 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 94.5/117 kN ratings change with the cup.
What is the difference between 4T-JLM710949/JLM710910 and a metric ISO 355 tapered bearing?
4T-JLM710949/JLM710910 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 65×105×24 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-JLM710949/JLM710910 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 JLM710949/JLM710910 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-JLM710949/JLM710910 list two speeds, 3,300 and 4,500 r/min?
The lower figure, 3,300 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-JLM710949/JLM710910 at 4,500 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.