2580/20

Manufacturer-published tapered-roller dimensions, load ratings, fatigue load limit, and limiting speed.

Bore d31.75 mmOutside diameter D66.421 mmOverall width T25.4 mmDynamic rating Cr89.2 kNKoyo calculation tool ↗

Live manufacturer specification row

Published specifications

Inch family

Designation: 2580/20
Family: Inch Tapered Roller Bearings
Bore d: 31.75 mm
Outside diameter D: 66.421 mm
Overall width T: 25.4 mm
Inner ring width B: 25.357 mm
Minimum corner radius r: 0.8 mm
Minimum corner radius r1: 3.2 mm
Dynamic load rating Cr: 89.2 kN
Static load rating C0r: 85.1 kN
Fatigue load limit Cu: 12.7 kN
Grease limiting speed: 6,000 rpm
Published row text: 2580/20 | 31.75 | 66.421 | 25.4 | 25.357 | 0.8 | 3.2 | 89.2 | 85.1 | 12.7 | 6000

Verification boundary

Do not infer interchange

Exact set architectureConfirm metric versus inch family, cone/cup identity, series, and complete designation.

Fits and geometryVerify shaft/housing seats, shoulders, fillets, preload/endplay, and mounting arrangement.

DutyCheck combined radial/axial loading, lubrication, speed, temperature, contamination, and required life.

Current manufacturer dataUse the linked JTEKT/Koyo calculation and CAD tools before ordering.

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