JM716648-JM716610 bearing: complete specifications & equivalents
The JM716648-JM716610 is a ANSI ABMA 19.2 radial bearing sized 85 x 130 x 30 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 85 mm |
| Outer diameter D | 130 mm |
| Width B | 30 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 149 kN |
| Basic static load rating C0 | 214 kN |
| Limiting speed (mechanical) | 2600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1370 g |
| Manufacturer designation | NTN 4T-JM716648/JM716610 |
| 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 | 3.346 in |
|---|---|
| Outer diameter D | 5.118 in |
| Width B | 1.181 in |
| ISO bore code | 48 |
| Radial section height (D−d)/2 | 22.5 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) | 102 of 148 |
| Bore above smallest 4t-inch-series size | 72.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| JM716648 | 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 JM716648-JM716610 model number is decoded
NTN supplies this 3.346 in (85 mm) shaft position as 4T-JM716648/JM716610: cone JM716648, cup JM716610, profiled rollers and a pressed-steel cage, rated 149 kN basic dynamic and 214 kN static. 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 — JM716648 sits in the JM metric-envelope family. Catalogue mass of the 4T-JM716648/JM716610 cone-plus-cup set is 1370 g; shaft and housing shoulders must carry that mass square to the axis during fitting. Cup-side note for JM716610: within the JM metric-envelope family tables the JM716648 cone is listed against several cup options, and it is the cup that fixes the 130 mm OD and the 30 mm assembled width — quote the full JM716648/JM716610 pair, never the cone alone. A single-row tapered bearing reacts thrust in one direction only; 4T-JM716648/JM716610 is adjusted against a second bearing so the shaft is located in both directions.
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
- 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
- brinell marks on cone and cup raceways from impact during handling or hammer fitting
Selection pitfalls — read before you substitute
- Mount the 85 mm cone by induction heating (max 120 °C) and the 130 mm cup with a press sleeve; at 1370 g a cocked ring brinells the raceway directly.
- The J-prefixed JM716648 code belongs to a metric-envelope inch family: its 85 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-JM716648/JM716610 sets have no seals: a hub or gearbox needs external sealing or the 2,600 r/min grease figure is meaningless once water reaches the cone rib.
- Shaft and housing fillets must clear the ring chamfers of JM716648 and JM716610; use undercut shoulders so the rings seat on the face, not on a radius.
- ABMA makes the 85×130 mm envelope interchangeable, not the ratings: NTN prints 149/214 kN for this execution and another make of the same number can differ in roller complement.
- The 149/214 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-JM716648/JM716610; 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-JM716648/JM716610?
4T-JM716648/JM716610 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 85 mm bore (3.346 in), 130 mm outside diameter and 30 mm assembled width T (5.118 × 1.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 149 kN, C0 214 kN, grease limiting speed 2,600 r/min, oil speed 3,500 r/min, mass about 1370 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-JM716648/JM716610 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the JM716648 cone or the JM716610 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 149/214 kN ratings change with the cup.
What is the difference between 4T-JM716648/JM716610 and a metric ISO 355 tapered bearing?
4T-JM716648/JM716610 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 85×130×30 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-JM716648/JM716610 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 JM716648/JM716610 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-JM716648/JM716610 list two speeds, 2,600 and 3,500 r/min?
The lower figure, 2,600 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-JM716648/JM716610 at 3,500 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.