JH211749-JH211710 bearing: complete specifications & equivalents
The JH211749-JH211710 is a ANSI ABMA 19.2 radial bearing sized 65 x 120 x 39 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 65 mm |
| Outer diameter D | 120 mm |
| Width B | 39 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 205 kN |
| Basic static load rating C0 | 248 kN |
| Limiting speed (mechanical) | 3100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1900 g |
| Manufacturer designation | NTN 4T-JH211749/JH211710 |
| 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 | 2.559 in |
|---|---|
| Outer diameter D | 4.724 in |
| Width B | 1.535 in |
| ISO bore code | 49 |
| Radial section height (D−d)/2 | 27.5 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) | 82 of 148 |
| Bore above smallest 4t-inch-series size | 52.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| JH211749 | 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 JH211749-JH211710 model number is decoded
For an inch shaft of 65 mm carrying combined radial and thrust load, NTN lists 4T-JH211749/JH211710, a single-row 4T tapered roller set of 205 kN C and 248 kN C0 inside the 120 mm OD cup. Cone and cup of 4T-JH211749/JH211710 are separately stocked parts: a worn JH211710 cup can be replaced against the existing JH211749 cone, provided the new cup carries the identical reference — pairing across references changes the 39 mm assembled width and the rating. Two single-row inch sets are normally mounted as an adjusted O or X pair; the 39 mm T of each 4T-JH211749/JH211710 enters the spacer calculation, so the tolerance on assembled width matters as much as the bore fit. The printed 205/248 kN ratings belong to the assembled JH211749+JH211710 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. Mount the 65 mm cone with an induction heater (max 120 °C) and press the 120 mm cup with a sleeve; driving either ring through the rollers brinells the raceways.
Typical equipment & failure modes
Common applications
- large conveyor head pulleys in bulk-handling plant
- paper-machine and calender roll supports
- off-highway and forestry machine axles
- marine winch and deck-machinery shafts
Known failure patterns
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- 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 fatigue when the pair runs continuously near the grease limiting speed without oil cooling
- water-induced pitting when the open bearing sees washdown without external seals
Selection pitfalls — read before you substitute
- Mount the 65 mm cone by induction heating (max 120 °C) and the 120 mm cup with a press sleeve; at 1900 g a cocked ring brinells the raceway directly.
- The J-prefixed JH211749 code belongs to a metric-envelope inch family: its 65 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 JH211749/JH211710 pair at ordering: the JH211749 cone also ships against sibling cups, and a cup from another reference changes the 39 mm assembled width and the rating.
- Grease packs must leave free volume inside the 39 mm-wide set; over-greasing a pair churning near the oil-band speed of 4,100 r/min raises temperature and destroys the setting.
- Fit selection follows the rotating ring: a rotating cone on a 65 mm shaft takes a k5/m5 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
- The 205/248 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-JH211749/JH211710; 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-JH211749/JH211710?
4T-JH211749/JH211710 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 65 mm bore (2.559 in), 120 mm outside diameter and 39 mm assembled width T (4.724 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 205 kN, C0 248 kN, grease limiting speed 3,100 r/min, oil speed 4,100 r/min, mass about 1900 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-JH211749/JH211710 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the JH211749 cone or the JH211710 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 205/248 kN ratings change with the cup.
What is the difference between 4T-JH211749/JH211710 and a metric ISO 355 tapered bearing?
4T-JH211749/JH211710 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 65×120×39 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-JH211749/JH211710 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 JH211749/JH211710 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-JH211749/JH211710 list two speeds, 3,100 and 4,100 r/min?
The lower figure, 3,100 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-JH211749/JH211710 at 4,100 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.