2688/31

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

Bore d26.988 mmOutside diameter D66.421 mmOverall width T23.812 mmDynamic rating Cr83.8 kNKoyo calculation tool ↗

Live manufacturer specification row

Published specifications

Inch family

Designation: 2688/31
Family: Inch Tapered Roller Bearings
Bore d: 26.988 mm
Outside diameter D: 66.421 mm
Overall width T: 23.812 mm
Inner ring width B: 25.433 mm
Minimum corner radius r: 1.6 mm
Minimum corner radius r1: 1.2 mm
Dynamic load rating Cr: 83.8 kN
Static load rating C0r: 75.2 kN
Fatigue load limit Cu: 11.2 kN
Grease limiting speed: 6,500 rpm
Published row text: 2688/31 | 26.988 | 66.421 | 23.812 | 25.433 | 1.6 | 1.2 | 83.8 | 75.2 | 11.2 | 6500

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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