Bearing 15123/15245 NTN

Technical Specifications

Bore (d): 1.2500 in (≈ 31.75 mm)

Outside diameter (D): 2.4409 in (≈ 61.999 mm)

Overall width (T): ~ 0.7500 in (≈ 19.05 mm)

Cone width (B): 19.05 mm

Cup width (C): 14.288 mm

Basic dynamic radial load rating (C): ~ 46.5 kN (≈10,500 lbf)

Basic static radial load rating (C₀): ~ 54.0 kN (≈12,100 lbf)

Speed limits (oil lubrication): ~8,200 rpm

Operating temperature range: −40 °C up to ~120 °C

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Key Features

Designed for combined radial + axial load capacity thanks to tapered roller geometry.

Separable cone & cup—allows flexible mounting and proper axial preload adjustment.

Manufactured to high precision (Class 2 in many listings) for demanding applications.

Inch-series size (imperial) — commonly used in equipment designed with inch standards.

Reliable NTN build quality — case-carburised steel, good fatigue life.

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Typical Applications

Gearboxes and transmissions where shafts carry both radial load and thrust.

Axle shafts or drives where axial location is required plus heavy radial loading.

Industrial equipment with mixed load conditions, especially where imperial-series bearings are specified.

Maintenance or replacement scenarios where the 15123/15245 set is called out.

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Spec / Ordering Notes

Ensure you order the correct cone (15123) and cup (15245) as a matched pair.

Verify the axial load direction: this bearing set supports axial loads in one direction unless configured in pairs.

Check shaft and housing fit, fillet radii, shoulder diameters—imperial series tolerances apply. For example, max fillet radius r₁s ~1.3 mm.

Confirm lubrication and speed environment; for example oil lubrication up to ~8,200 rpm for this bearing.

Since it is inch-series, confirm dimension compatibility if replacing metric bearings.