JM714249-JM714210 bearing: complete specifications & equivalents
The JM714249-JM714210 is a ANSI ABMA 19.2 radial bearing sized 75 x 120 x 31 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 75 mm |
| Outer diameter D | 120 mm |
| Width B | 31 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 145 kN |
| Basic static load rating C0 | 197 kN |
| Limiting speed (mechanical) | 2900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1290 g |
| Manufacturer designation | NTN 4T-JM714249/JM714210 |
| 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 | 2.953 in |
|---|---|
| Outer diameter D | 4.724 in |
| Width B | 1.22 in |
| ISO bore code | 49 |
| 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) | 93 of 148 |
| Bore above smallest 4t-inch-series size | 62.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| JM714249 | 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 JM714249-JM714210 model number is decoded
4T-JM714249/JM714210 belongs to the NTN inch 4T tapered roller range (JM metric-envelope family); cone and cup are ordered by their own references and are individually interchangeable with like-numbered parts. The 4T prefix is NTN's tapered roller quality mark stamped on both parts; it is a brand mark, not a size code, so cross-references quote JM714249/JM714210 without it. Catalogue mass of the 4T-JM714249/JM714210 cone-plus-cup set is 1290 g; shaft and housing shoulders must carry that mass square to the axis during fitting. The printed 145/197 kN ratings belong to the assembled JM714249+JM714210 pair; a sibling row using the same cone with a different cup carries its own rating row because the raceway track shifts with the cup. NTN grades inch 4T bearings as open bearings without integral seals; at 75 mm bore the application supplies sealing and the grease fill or oil feed.
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
- 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
- indentation of the raceways by hard particles in an open, unsealed arrangement
Selection pitfalls — read before you substitute
- Mount the 75 mm cone by induction heating (max 120 °C) and the 120 mm cup with a press sleeve; at 1290 g a cocked ring brinells the raceway directly.
- The J-prefixed JM714249 code belongs to a metric-envelope inch family: its 75 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 JM714249/JM714210 pair at ordering: the JM714249 cone also ships against sibling cups, and a cup from another reference changes the 31 mm assembled width and the rating.
- Shaft and housing fillets must clear the ring chamfers of JM714249 and JM714210; use undercut shoulders so the rings seat on the face, not on a radius.
- Replacing one half of an adjusted pair without resetting end play negates the 31 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 145/197 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-JM714249/JM714210; 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-JM714249/JM714210?
4T-JM714249/JM714210 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 75 mm bore (2.953 in), 120 mm outside diameter and 31 mm assembled width T (4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 145 kN, C0 197 kN, grease limiting speed 2,900 r/min, oil speed 3,900 r/min, mass about 1290 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-JM714249/JM714210 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the JM714249 cone or the JM714210 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 145/197 kN ratings change with the cup.
What is the difference between 4T-JM714249/JM714210 and a metric ISO 355 tapered bearing?
4T-JM714249/JM714210 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 75×120×31 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-JM714249/JM714210 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 JM714249/JM714210 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-JM714249/JM714210 list two speeds, 2,900 and 3,900 r/min?
The lower figure, 2,900 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-JM714249/JM714210 at 3,900 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.