LM501349-LM501314 bearing: complete specifications & equivalents
The LM501349-LM501314 is a ANSI ABMA 19.2 radial bearing sized 41.275 x 73.431 x 21.43 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 41.275 mm |
| Outer diameter D | 73.431 mm |
| Width B | 21.43 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 62 kN |
| Basic static load rating C0 | 69.5 kN |
| Limiting speed (mechanical) | 5000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 354 g |
| Manufacturer designation | NTN 4T-LM501349/LM501314 |
| 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 | 1.625 in |
|---|---|
| Outer diameter D | 2.891 in |
| Width B | 0.844 in |
| ISO bore code | 49 |
| Radial section height (D−d)/2 | 16.1 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) | 47 of 148 |
| Bore above smallest 4t-inch-series size | 28.575 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| LM501349-LM501310 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same NTN cone 4T-LM501349 paired with a different cup (LM501310): cone interchangeable, cup differs — OD, assembled width T and ratings follow the cup. Verify the full cone/cup reference before substituting. |
| LM501349-310 | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue. |
| LM501349-314 | 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 LM501349-LM501314 model number is decoded
For an inch shaft of 41.275 mm carrying combined radial and thrust load, NTN lists 4T-LM501349/LM501314, a single-row 4T tapered roller set of 62 kN C and 69.5 kN C0 inside the 73.431 mm OD cup. Unlike ISO 355 metric numbers, this ABMA code does not encode the bore arithmetically: LM501349 identifies the cone of 41.275 mm (1.625 in) bore by catalogue lookup, and LM501314 fixes the 73.431 mm OD. Contact-angle geometry of the light-medium LM family gives 4T-LM501349/LM501314 its radial/axial load split — at 62/69.5 kN the static rating is about 1.12× C, typical of inch tapered sets proportioned for combined duty. The printed 62/69.5 kN ratings belong to the assembled LM501349+LM501314 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. Running clearance of 4T-LM501349/LM501314 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
- 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
- water-induced pitting when the open bearing sees washdown without external seals
Selection pitfalls — read before you substitute
- Hub and pinion positions of this 41.275 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-LM501349/LM501314.
- The light-medium LM family at 41.275 mm bore (73.431×21.43 mm assembled) is one of several inch families sharing similar bores; cross-series swaps change OD, T and contact angle, so match the full LM501349/LM501314 reference at purchase.
- Open 4T-LM501349/LM501314 sets have no seals: a hub or gearbox needs external sealing or the 5,000 r/min grease figure is meaningless once water reaches the cone rib.
- Do not confuse T (21.43 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 21.43 mm-wide set; over-greasing a pair churning near the oil-band speed of 6,600 r/min raises temperature and destroys the setting.
- The 62/69.5 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 4T-LM501349/LM501314; 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-LM501349/LM501314?
4T-LM501349/LM501314 is an inch-series single-row tapered roller bearing to the ABMA boundary plan: 41.275 mm bore (1.625 in), 73.431 mm outside diameter and 21.43 mm assembled width T (2.891 × 0.844 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 62 kN, C0 69.5 kN, grease limiting speed 5,000 r/min, oil speed 6,600 r/min, mass about 354 g. It is an open, separable cone/cup set with a pressed-steel cage.
Are the cone and cup of 4T-LM501349/LM501314 interchangeable separately?
Yes — ABMA inch parts are individually interchangeable: the LM501349 cone or the LM501314 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 62/69.5 kN ratings change with the cup.
What is the difference between 4T-LM501349/LM501314 and a metric ISO 355 tapered bearing?
4T-LM501349/LM501314 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 41.275×73.431×21.43 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-LM501349/LM501314 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 LM501349/LM501314 references; the 4T spelling is retained among this page's search aliases.
Why does 4T-LM501349/LM501314 list two speeds, 5,000 and 6,600 r/min?
The lower figure, 5,000 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-LM501349/LM501314 at 6,600 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.