LM814849-LM814810 bearing: complete specifications & equivalents
The LM814849-LM814810 is a ANSI ABMA 19.2 radial bearing sized 77.788 x 117.475 x 25.4 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 77.788 mm |
| Outer diameter D | 117.475 mm |
| Width B | 25.4 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 110 kN |
| Basic static load rating C0 | 162 kN |
| Limiting speed (mechanical) | 2900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 929 g |
| Manufacturer designation | NTN 4T-LM814849/LM814810 |
| 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 | 3.063 in |
|---|---|
| Outer diameter D | 4.625 in |
| Width B | 1 in |
| ISO bore code | 49 |
| Radial section height (D−d)/2 | 19.8 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) | 95 of 148 |
| Bore above smallest 4t-inch-series size | 65.088 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| LM814849 | 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 LM814849-LM814810 model number is decoded
The NTN 2203E inch table prints 4T-LM814849/LM814810 at 77.788 mm bore (3.063 in), 117.475 mm cup OD and 25.4 mm assembled T, with a grease limiting speed of 2,900 r/min and an oil ceiling of 3,900 r/min. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: LM814849 identifies the cone of 77.788 mm (3.063 in) bore by catalogue lookup, and LM814810 fixes the 117.475 mm OD. Catalogue mass of the 4T-LM814849/LM814810 cone-plus-cup set is 929 g; shaft and housing shoulders must carry that mass square to the axis during fitting. Housing fitment sequence for 4T-LM814849/LM814810: press the LM814810 cup square into the 117.475 mm seat first, then bring the LM814849 cone (on its 77.788 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. Running clearance of 4T-LM814849/LM814810 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
- plant gearboxes on inch-dimensioned shaft lines
- large conveyor head pulleys in bulk-handling plant
- paper-machine and calender roll supports
- off-highway and forestry machine axles
Known failure patterns
- rib-face scoring when the thrust share of the combined load exceeds what the cone rib of this size carries
- flaking on one cone only when a bent shaft loads the O/X pair unevenly
- cup creep and housing fretting when the cup seat is cut too loose for the rotating load
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- Mount the 77.788 mm cone by induction heating (max 120 °C) and the 117.475 mm cup with a press sleeve; at 929 g a cocked ring brinells the raceway directly.
- The light-medium LM family at 77.788 mm bore (117.475×25.4 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full LM814849/LM814810 reference at purchase.
- Shaft and housing fillets must clear the ring chamfers of LM814849 and LM814810; use undercut shoulders so the rings seat on the face, not on a radius.
- An unloaded 4T-LM814849/LM814810 near 2,900 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded high-speed pairs.
- Replacing one half of an adjusted pair without resetting end play negates the 25.4 mm T logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 110/162 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-LM814849/LM814810; 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-LM814849/LM814810?
4T-LM814849/LM814810 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 77.788 mm bore (3.063 in), 117.475 mm outside diameter and 25.4 mm assembled width T (4.625 × 1 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 110 kN, C0 162 kN, grease limiting speed 2,900 r/min, oil speed 3,900 r/min, mass about 929 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-LM814849/LM814810 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the LM814849 cone or the LM814810 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 110/162 kN ratings change with the cup.
What is the difference between 4T-LM814849/LM814810 and a metric ISO 355 tapered bearing?
4T-LM814849/LM814810 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 77.788×117.475×25.4 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-LM814849/LM814810 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 LM814849/LM814810 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-LM814849/LM814810 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-LM814849/LM814810 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.