L432349-L432310 bearing: complete specifications & equivalents
The L432349-L432310 is a ANSI ABMA 19.2 radial bearing sized 158.75 x 205.583 x 23.812 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 158.75 mm |
| Outer diameter D | 205.583 mm |
| Width B | 23.812 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 140 kN |
| Basic static load rating C0 | 247 kN |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1890 g |
| Manufacturer designation | NTN 4T-L432349/L432310 |
| 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 | 6.25 in |
|---|---|
| Outer diameter D | 8.094 in |
| Width B | 0.937 in |
| ISO bore code | 49 |
| Radial section height (D−d)/2 | 23.4 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) | 142 of 148 |
| Bore above smallest 4t-inch-series size | 146.05 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| L432349-310 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 158.75×205.583×23.812 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 L432349-L432310 model number is decoded
For an inch shaft of 158.75 mm carrying combined radial and thrust load, NTN lists 4T-L432349/L432310, a single-row 4T tapered roller set of 140 kN C and 247 kN C0 inside the 205.583 mm OD cup. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: L432349 identifies the cone of 158.75 mm (6.25 in) bore by catalogue lookup, and L432310 fixes the 205.583 mm OD. The 0.9 kN of dynamic capacity per millimetre of bore summarises the 140 kN rating over the 158.75 mm bore — sanity-check any interchange candidate against this ratio and the 23.812 mm T. The printed 140/247 kN ratings belong to the assembled L432349+L432310 pair; a sibling row using the same cone with a different cup carries its own rating row because the raceway track shifts with the cup. A single-row tapered bearing reacts thrust in one direction only; 4T-L432349/L432310 is adjusted against a second bearing so the shaft is located in both directions.
Typical equipment & failure modes
Common applications
- port-crane travel and hoist gearboxes
- cement-plant mill and kiln drive trains
- large shredder and recycler main shafts
- power-plant coal-mill and fan 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
- indentation of the raceways by hard particles in an open, unsealed arrangement
Selection pitfalls — read before you substitute
- At 158.75 mm bore the 4T-L432349/L432310 set is adjusted with hydraulic nuts or measured shims on mill and crane positions; manual torque methods cannot control preload at the 140 kN C level.
- The light L family at 158.75 mm bore (205.583×23.812 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full L432349/L432310 reference at purchase.
- ABMA makes the 158.75×205.583 mm envelope interchangeable, not the ratings: NTN prints 140/247 kN for this execution and another make of the same number can differ in roller complement.
- ABMA makes the 158.75×205.583 mm envelope interchangeable, not the ratings: NTN prints 140/247 kN for this execution and another make of the same number can differ in roller complement.
- Do not confuse T (23.812 mm, the assembled cone-plus-cup width) with the cone width when drawing spacers; an abutment sized to T leaves the cup unseated.
- The 140/247 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-L432349/L432310; 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-L432349/L432310?
4T-L432349/L432310 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 158.75 mm bore (6.25 in), 205.583 mm outside diameter and 23.812 mm assembled width T (8.094 × 0.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 140 kN, C0 247 kN, grease limiting speed 1,500 r/min, oil speed 2,000 r/min, mass about 1890 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-L432349/L432310 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the L432349 cone or the L432310 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 140/247 kN ratings change with the cup.
What is the difference between 4T-L432349/L432310 and a metric ISO 355 tapered bearing?
4T-L432349/L432310 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 158.75×205.583×23.812 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-L432349/L432310 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 L432349/L432310 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-L432349/L432310 list two speeds, 1,500 and 2,000 r/min?
The lower figure, 1,500 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-L432349/L432310 at 2,000 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.