JM207049-JM207010 bearing: complete specifications & equivalents
The JM207049-JM207010 is a ANSI ABMA 19.2 radial bearing sized 55 x 95 x 29 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 55 mm |
| Outer diameter D | 95 mm |
| Width B | 29 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 119 kN |
| Basic static load rating C0 | 144 kN |
| Limiting speed (mechanical) | 3800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 823 g |
| Manufacturer designation | NTN 4T-JM207049/JM207010 |
| 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 | 2.165 in |
|---|---|
| Outer diameter D | 3.74 in |
| Width B | 1.142 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) | 69 of 148 |
| Bore above smallest 4t-inch-series size | 42.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| JM207049 | 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 JM207049-JM207010 model number is decoded
NTN supplies this 2.165 in (55 mm) shaft position as 4T-JM207049/JM207010: cone JM207049, cup JM207010, profiled rollers and a pressed-steel cage, rated 119 kN basic dynamic and 144 kN static. Cone and cup of 4T-JM207049/JM207010 are separately stocked parts: a worn JM207010 cup can be replaced against the existing JM207049 cone, provided the new cup carries the identical reference — pairing across references changes the 29 mm assembled width and the rating. The 20.0 mm radial section over the 55 mm bore positions the contact line of the pair; abutment shoulders and spacers are dimensioned from that geometry, not from the bore alone. The printed 119/144 kN ratings belong to the assembled JM207049+JM207010 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. The rollers run with their large ends against the cone's guide rib; lubricant must reach that rib face of 4T-JM207049/JM207010, not only the raceway, or the pair smears on the first overloaded start.
Typical equipment & failure modes
Common applications
- agricultural tractor transmission and PTO shafts
- industrial gearboxes built to inch shafting
- construction-equipment pivot and wheel positions
- mining and quarry conveyor drive pulleys
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
- water-induced pitting when the open bearing sees washdown without external seals
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 55 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-JM207049/JM207010.
- The J-prefixed JM207049 code belongs to a metric-envelope inch family: its 55 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.
- An unloaded 4T-JM207049/JM207010 near 3,800 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded high-speed pairs.
- Shaft and housing fillets must clear the ring chamfers of JM207049 and JM207010; use undercut shoulders so the rings seat on the face, not on a radius.
- Quote the full JM207049/JM207010 pair at ordering: the JM207049 cone also ships against sibling cups, and a cup from another reference changes the 29 mm assembled width and the rating.
- The 119/144 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-JM207049/JM207010; 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-JM207049/JM207010?
4T-JM207049/JM207010 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 55 mm bore (2.165 in), 95 mm outside diameter and 29 mm assembled width T (3.74 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 119 kN, C0 144 kN, grease limiting speed 3,800 r/min, oil speed 5,100 r/min, mass about 823 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-JM207049/JM207010 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the JM207049 cone or the JM207010 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 119/144 kN ratings change with the cup.
What is the difference between 4T-JM207049/JM207010 and a metric ISO 355 tapered bearing?
4T-JM207049/JM207010 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 55×95×29 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-JM207049/JM207010 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 JM207049/JM207010 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-JM207049/JM207010 list two speeds, 3,800 and 5,100 r/min?
The lower figure, 3,800 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-JM207049/JM207010 at 5,100 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.