JM205149-JM205110 bearing: complete specifications & equivalents
The JM205149-JM205110 is a ANSI ABMA 19.2 radial bearing sized 50 x 90 x 28 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 50 mm |
| Outer diameter D | 90 mm |
| Width B | 28 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 118 kN |
| Basic static load rating C0 | 141 kN |
| Limiting speed (mechanical) | 4100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 755 g |
| Manufacturer designation | NTN 4T-JM205149/JM205110 |
| 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 | 1.969 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 1.102 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) | 63 of 148 |
| Bore above smallest 4t-inch-series size | 37.3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| JM205149 | 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 JM205149-JM205110 model number is decoded
For an inch shaft of 50 mm carrying combined radial and thrust load, NTN lists 4T-JM205149/JM205110, a single-row 4T tapered roller set of 118 kN C and 141 kN C0 inside the 90 mm OD cup. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: JM205149 identifies the cone of 50 mm (1.969 in) bore by catalogue lookup, and JM205110 fixes the 90 mm OD. The 2.4 kN of dynamic capacity per millimetre of bore summarises the 118 kN rating over the 50 mm bore — sanity-check any interchange candidate against this ratio and the 28 mm T. Housing fitment sequence for 4T-JM205149/JM205110: press the JM205110 cup square into the 90 mm seat first, then bring the JM205149 cone (on its 50 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. Running clearance of 4T-JM205149/JM205110 is set at mounting by axial displacement of cone or cup — the catalogue does not ship a preloaded set, so the drawing must state end play or preload.
Typical equipment & failure modes
Common applications
- machine-tool headstocks on inch spindles
- pump and blower drive shafts with combined load
- truck and trailer axle hubs on inch-dimensioned axles
- agricultural tractor transmission and PTO 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
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 50 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-JM205149/JM205110.
- The J-prefixed JM205149 code belongs to a metric-envelope inch family: its 50 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.
- Inch and metric bores collide on paper — 50 mm is 1.969 in, not a round metric size; a metric bearing that seems 0.1 mm off will not seat on the inch shaft.
- Grease packs must leave free volume inside the 28 mm-wide set; over-greasing a pair churning near the oil-band speed of 5,400 r/min raises temperature and destroys the setting.
- Shaft and housing fillets must clear the ring chamfers of JM205149 and JM205110; use undercut shoulders so the rings seat on the face, not on a radius.
- The 118/141 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-JM205149/JM205110; 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-JM205149/JM205110?
4T-JM205149/JM205110 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 50 mm bore (1.969 in), 90 mm outside diameter and 28 mm assembled width T (3.543 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 118 kN, C0 141 kN, grease limiting speed 4,100 r/min, oil speed 5,400 r/min, mass about 755 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-JM205149/JM205110 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the JM205149 cone or the JM205110 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 118/141 kN ratings change with the cup.
What is the difference between 4T-JM205149/JM205110 and a metric ISO 355 tapered bearing?
4T-JM205149/JM205110 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 50×90×28 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-JM205149/JM205110 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 JM205149/JM205110 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-JM205149/JM205110 list two speeds, 4,100 and 5,400 r/min?
The lower figure, 4,100 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-JM205149/JM205110 at 5,400 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.