L814749-L814710 bearing: complete specifications & equivalents
The L814749-L814710 is a ANSI ABMA 19.2 radial bearing sized 76.2 x 109.538 x 19.05 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 76.2 mm |
| Outer diameter D | 109.538 mm |
| Width B | 19.05 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 70 kN |
| Basic static load rating C0 | 115 kN |
| Limiting speed (mechanical) | 3100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 579 g |
| Manufacturer designation | NTN 4T-L814749/L814710 |
| 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 in |
|---|---|
| Outer diameter D | 4.313 in |
| Width B | 0.75 in |
| ISO bore code | 49 |
| Radial section height (D−d)/2 | 16.7 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) | 94 of 148 |
| Bore above smallest 4t-inch-series size | 63.5 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| L814749-710 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 76.2×109.538×19.05 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 L814749-L814710 model number is decoded
For an inch shaft of 76.2 mm carrying combined radial and thrust load, NTN lists 4T-L814749/L814710, a single-row 4T tapered roller set of 70 kN C and 115 kN C0 inside the 109.538 mm OD cup. Reading the designation: 4T-L814749/L814710 follows the ABMA inch convention — the number before the slash is the cone (inner ring with roller set and cage), the number after the slash is the cup (outer ring), and the light L family lettering ties the pair to its boundary plan. The 16.7 mm radial section over the 76.2 mm bore positions the contact line of the pair; abutment shoulders and spacers are dimensioned from that geometry, not from the bore alone. Housing fitment sequence for 4T-L814749/L814710: press the L814710 cup square into the 109.538 mm seat first, then bring the L814749 cone (on its 76.2 mm shaft) into adjustment — the two references are separate engineering parts that happen to ship as one set. A single-row tapered bearing reacts thrust in one direction only; 4T-L814749/L814710 is adjusted against a second bearing so the shaft is located in both directions.
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
- cone-rib and roller large-end smearing when the adjusted pair runs with preload but starved lubricant film
- 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
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- Mount the 76.2 mm cone by induction heating (max 120 °C) and the 109.538 mm cup with a press sleeve; at 579 g a cocked ring brinells the raceway directly.
- The light L family at 76.2 mm bore (109.538×19.05 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full L814749/L814710 reference at purchase.
- Do not confuse T (19.05 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- Grease packs must leave free volume inside the 19.05 mm-wide set; over-greasing a pair churning near the oil-band speed of 4,100 r/min raises temperature and destroys the setting.
- Never drive the 109.538 mm cup home through the rollers: fitting force goes through the ring faces only, or brinell marks release as noise within the first running hours.
- The 70/115 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-L814749/L814710; 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-L814749/L814710?
4T-L814749/L814710 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 76.2 mm bore (3 in), 109.538 mm outside diameter and 19.05 mm assembled width T (4.313 × 0.75 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 70 kN, C0 115 kN, grease limiting speed 3,100 r/min, oil speed 4,100 r/min, mass about 579 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-L814749/L814710 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the L814749 cone or the L814710 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 70/115 kN ratings change with the cup.
What is the difference between 4T-L814749/L814710 and a metric ISO 355 tapered bearing?
4T-L814749/L814710 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 76.2×109.538×19.05 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-L814749/L814710 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 L814749/L814710 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-L814749/L814710 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-L814749/L814710 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.