LM102949-LM102910 bearing: complete specifications & equivalents
The LM102949-LM102910 is a ANSI ABMA 19.2 radial bearing sized 45.242 x 73.431 x 19.558 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 45.242 mm |
| Outer diameter D | 73.431 mm |
| Width B | 19.558 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 60 kN |
| Basic static load rating C0 | 76 kN |
| Limiting speed (mechanical) | 4800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 309 g |
| Manufacturer designation | NTN 4T-LM102949/LM102910 |
| 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 | 1.781 in |
|---|---|
| Outer diameter D | 2.891 in |
| Width B | 0.77 in |
| ISO bore code | 49 |
| Radial section height (D−d)/2 | 14.1 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) | 55 of 148 |
| Bore above smallest 4t-inch-series size | 32.542 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| LM102949-910 | SKF | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
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 LM102949-LM102910 model number is decoded
NTN supplies this 1.781 in (45.242 mm) shaft position as 4T-LM102949/LM102910: cone LM102949, cup LM102910, profiled rollers and a pressed-steel cage, rated 60 kN basic dynamic and 76 kN static. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: LM102949 identifies the cone of 45.242 mm (1.781 in) bore by catalogue lookup, and LM102910 fixes the 73.431 mm OD. Contact-angle geometry of the light-medium LM family gives 4T-LM102949/LM102910 its radial/axial load split — at 60/76 kN the static rating is about 1.27× C, typical of inch tapered sets proportioned for combined duty. Cup-side note for LM102910: within the light-medium LM family tables the LM102949 cone is listed against several cup options, and it is the cup that fixes the 73.431 mm OD and the 19.558 mm assembled width — quote the full LM102949/LM102910 pair, never the cone alone. NTN grades inch 4T bearings as open bearings without integral seals; at 45.242 mm bore the application supplies sealing and the grease fill or oil feed.
Typical equipment & failure modes
Common applications
- truck and trailer axle hubs on inch-dimensioned axles
- agricultural tractor transmission and PTO shafts
- industrial gearboxes built to inch shafting
- construction-equipment pivot and wheel positions
Known failure patterns
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- 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
- rolling-contact fatigue spalling after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 45.242 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-LM102949/LM102910.
- The light-medium LM family at 45.242 mm bore (73.431×19.558 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full LM102949/LM102910 reference at purchase.
- Do not confuse T (19.558 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- Fit selection follows the rotating ring: a rotating cone on a 45.242 mm shaft takes a k5/m5 seat, and a rotating cup reverses the logic — decide from the load diagram, not from habit.
- Shaft and housing fillets must clear the ring chamfers of LM102949 and LM102910; use undercut shoulders so the rings seat on the face, not on a radius.
- The 60/76 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-LM102949/LM102910; 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-LM102949/LM102910?
4T-LM102949/LM102910 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 45.242 mm bore (1.781 in), 73.431 mm outside diameter and 19.558 mm assembled width T (2.891 × 0.77 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 60 kN, C0 76 kN, grease limiting speed 4,800 r/min, oil speed 6,400 r/min, mass about 309 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-LM102949/LM102910 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the LM102949 cone or the LM102910 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 60/76 kN ratings change with the cup.
What is the difference between 4T-LM102949/LM102910 and a metric ISO 355 tapered bearing?
4T-LM102949/LM102910 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 45.242×73.431×19.558 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-LM102949/LM102910 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 LM102949/LM102910 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-LM102949/LM102910 list two speeds, 4,800 and 6,400 r/min?
The lower figure, 4,800 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-LM102949/LM102910 at 6,400 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.