JL69349-JL69310 bearing: complete specifications & equivalents
The JL69349-JL69310 is a ANSI ABMA 19.2 radial bearing sized 38 x 63 x 17 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 38 mm |
| Outer diameter D | 63 mm |
| Width B | 17 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 43 kN |
| Basic static load rating C0 | 52.5 kN |
| Limiting speed (mechanical) | 5700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 200 g |
| Manufacturer designation | NTN 4T-JL69349/JL69310 |
| 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 | 1.496 in |
|---|---|
| Outer diameter D | 2.48 in |
| Width B | 0.669 in |
| ISO bore code | 49 |
| Radial section height (D−d)/2 | 12.5 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) | 41 of 148 |
| Bore above smallest 4t-inch-series size | 25.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| JL69349 | 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 JL69349-JL69310 model number is decoded
4T-JL69349/JL69310 is the NTN 4T catalogue entry for a 38×63×17 mm inch tapered roller bearing — an ABMA-dimensioned cone/cup set, not an ISO 355 metric bearing, even though the table quotes metric equivalents. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: JL69349 identifies the cone of 38 mm (1.496 in) bore by catalogue lookup, and JL69310 fixes the 63 mm OD. The 1.1 kN of dynamic capacity per millimetre of bore summarises the 43 kN rating over the 38 mm bore — sanity-check any interchange candidate against this ratio and the 17 mm T. Cup-side note for JL69310: within the JL prefixed family tables the JL69349 cone is listed against several cup options, and it is the cup that fixes the 63 mm OD and the 17 mm assembled width — quote the full JL69349/JL69310 pair, never the cone alone. Running clearance of 4T-JL69349/JL69310 is set at mounting by axial displacement of cone or cup — the catalogue does not ship a preloaded set, so the drawing must state end play or preload.
Typical equipment & failure modes
Common applications
- truck and trailer axle hubs on inch-dimensioned axles
- agricultural tractor transmission and PTO shafts
- industrial gearboxes built to inch shafting
- construction-equipment pivot and wheel positions
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- cup creep and housing fretting when the cup seat is cut too loose for the rotating load
- flaking on one cone only when a bent shaft loads the O/X pair unevenly
- 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 38 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-JL69349/JL69310.
- The J-prefixed JL69349 code belongs to a metric-envelope inch family: its 38 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-JL69349/JL69310 sets have no seals: a hub or gearbox needs external sealing or the 5,700 r/min grease figure is meaningless once water reaches the cone rib.
- ABMA makes the 38×63 mm envelope interchangeable, not the ratings: NTN prints 43/52.5 kN for this execution and another make of the same number can differ in roller complement.
- Quote the full JL69349/JL69310 pair at ordering: the JL69349 cone also ships against sibling cups, and a cup from another reference changes the 17 mm assembled width and the rating.
- The 43/52.5 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-JL69349/JL69310; 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-JL69349/JL69310?
4T-JL69349/JL69310 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 38 mm bore (1.496 in), 63 mm outside diameter and 17 mm assembled width T (2.48 × 0.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 43 kN, C0 52.5 kN, grease limiting speed 5,700 r/min, oil speed 7,600 r/min, mass about 200 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-JL69349/JL69310 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the JL69349 cone or the JL69310 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 43/52.5 kN ratings change with the cup.
What is the difference between 4T-JL69349/JL69310 and a metric ISO 355 tapered bearing?
4T-JL69349/JL69310 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 38×63×17 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-JL69349/JL69310 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 JL69349/JL69310 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-JL69349/JL69310 list two speeds, 5,700 and 7,600 r/min?
The lower figure, 5,700 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-JL69349/JL69310 at 7,600 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.