JLM508748-JLM508710 bearing: complete specifications & equivalents
The JLM508748-JLM508710 is a ANSI ABMA 19.2 radial bearing sized 60 x 95 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 | 60 mm |
| Outer diameter D | 95 mm |
| Width B | 24 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 92.5 kN |
| Basic static load rating C0 | 122 kN |
| Limiting speed (mechanical) | 3700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 609 g |
| Manufacturer designation | NTN 4T-JLM508748/JLM508710 |
| 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 | 2.362 in |
|---|---|
| Outer diameter D | 3.74 in |
| Width B | 0.945 in |
| ISO bore code | 48 |
| 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) | 76 of 148 |
| Bore above smallest 4t-inch-series size | 47.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| JLM508748 | 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 JLM508748-JLM508710 model number is decoded
For an inch shaft of 60 mm carrying combined radial and thrust load, NTN lists 4T-JLM508748/JLM508710, a single-row 4T tapered roller set of 92.5 kN C and 122 kN C0 inside the 95 mm OD cup. Letter prefixes inherited from the inch convention mark the load family: LM reads as light-medium, HM as heavy-medium, LL as extra-light, J-prefixed codes as metric-envelope families — JLM508748 sits in the JLM prefixed family. Grease relubrication at the 3,700 r/min limiting speed targets the cone-rib contact; sustaining 4,900 r/min needs an oil supply directed at the large roller ends. Housing fitment sequence for 4T-JLM508748/JLM508710: press the JLM508710 cup square into the 95 mm seat first, then bring the JLM508748 cone (on its 60 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. With a rotating shaft a k5/m5 cone seat and an easy-push cup seat are typical practice for 4T-JLM508748/JLM508710; reverse the fit logic when the cup rotates.
Typical equipment & failure modes
Common applications
- paper-machine and calender roll supports
- off-highway and forestry machine axles
- marine winch and deck-machinery shafts
- crusher and screening-plant eccentric shafts
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
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- Mount the 60 mm cone by induction heating (max 120 °C) and the 95 mm cup with a press sleeve; at 609 g a cocked ring brinells the raceway directly.
- The J-prefixed JLM508748 code belongs to a metric-envelope inch family: its 60 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 JLM508748/JLM508710 pair at ordering: the JLM508748 cone also ships against sibling cups, and a cup from another reference changes the 24 mm assembled width and the rating.
- 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.
- Shaft and housing fillets must clear the ring chamfers of JLM508748 and JLM508710; use undercut shoulders so the rings seat on the face, not on a radius.
- The 92.5/122 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-JLM508748/JLM508710; 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-JLM508748/JLM508710?
4T-JLM508748/JLM508710 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 60 mm bore (2.362 in), 95 mm outside diameter and 24 mm assembled width T (3.74 × 0.945 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 92.5 kN, C0 122 kN, grease limiting speed 3,700 r/min, oil speed 4,900 r/min, mass about 609 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-JLM508748/JLM508710 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the JLM508748 cone or the JLM508710 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 92.5/122 kN ratings change with the cup.
What is the difference between 4T-JLM508748/JLM508710 and a metric ISO 355 tapered bearing?
4T-JLM508748/JLM508710 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 60×95×24 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-JLM508748/JLM508710 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 JLM508748/JLM508710 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-JLM508748/JLM508710 list two speeds, 3,700 and 4,900 r/min?
The lower figure, 3,700 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-JLM508748/JLM508710 at 4,900 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.