L44649-L44610 bearing: complete specifications & equivalents
The L44649-L44610 is a ANSI ABMA 19.2 radial bearing sized 26.988 x 50.292 x 14.224 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 26.988 mm |
| Outer diameter D | 50.292 mm |
| Width B | 14.224 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 32 kN |
| Basic static load rating C0 | 34 kN |
| Limiting speed (mechanical) | 7400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 120 g |
| Manufacturer designation | NTN 4T-L44649/L44610 |
| 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 | 1.063 in |
|---|---|
| Outer diameter D | 1.98 in |
| Width B | 0.56 in |
| ISO bore code | 49 |
| Radial section height (D−d)/2 | 11.7 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) | 22 of 148 |
| Bore above smallest 4t-inch-series size | 14.288 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| L44649-610 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 26.988×50.292×14.224 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
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 L44649-L44610 model number is decoded
4T-L44649/L44610 belongs to the NTN inch 4T tapered roller range (light L family); cone and cup are ordered by their own references and are individually interchangeable with like-numbered parts. 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 — L44649 sits in the light L family. Two single-row inch sets are normally mounted as an adjusted O or X pair; the 14.224 mm T of each 4T-L44649/L44610 enters the spacer calculation, so the tolerance on assembled width matters as much as the bore fit. Housing fitment sequence for 4T-L44649/L44610: press the L44610 cup square into the 50.292 mm seat first, then bring the L44649 cone (on its 26.988 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. Mount the 26.988 mm cone with an induction heater (max 120 °C) and press the 50.292 mm cup with a sleeve; driving either ring through the rollers brinells the raceways.
Typical equipment & failure modes
Common applications
- pump and blower drive shafts with combined load
- truck and trailer axle hubs on inch-dimensioned axles
- agricultural tractor transmission and PTO shafts
- industrial gearboxes built to inch shafting
Known failure patterns
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- false brinelling on a stationary pair exposed to vibration during transport or standby
- preload loss and noise after one bearing of the adjusted pair is replaced without resetting end play
- cage damage from a mounting blow transmitted through the roller complement
- edge loading when shaft deflection exceeds the few arc-minutes an adjusted pair tolerates
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 26.988 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-L44649/L44610.
- The light L family at 26.988 mm bore (50.292×14.224 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full L44649/L44610 reference at purchase.
- Replacing one half of an adjusted pair without resetting end play negates the 14.224 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- Open 4T-L44649/L44610 sets have no seals: a hub or gearbox needs external sealing or the 7,400 r/min grease figure is meaningless once water reaches the cone rib.
- Replacing one half of an adjusted pair without resetting end play negates the 14.224 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 32/34 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-L44649/L44610; 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-L44649/L44610?
4T-L44649/L44610 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 26.988 mm bore (1.063 in), 50.292 mm outside diameter and 14.224 mm assembled width T (1.98 × 0.56 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 32 kN, C0 34 kN, grease limiting speed 7,400 r/min, oil speed 9,900 r/min, mass about 120 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-L44649/L44610 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the L44649 cone or the L44610 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 32/34 kN ratings change with the cup.
What is the difference between 4T-L44649/L44610 and a metric ISO 355 tapered bearing?
4T-L44649/L44610 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 26.988×50.292×14.224 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-L44649/L44610 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 L44649/L44610 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-L44649/L44610 list two speeds, 7,400 and 9,900 r/min?
The lower figure, 7,400 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-L44649/L44610 at 9,900 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.