303/28R

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

Bore d28 mmOutside diameter D68 mmOverall width T19.75 mmDynamic rating Cr66.9 kNKoyo calculation tool ↗

Live manufacturer specification row

Published specifications

Metric family

Designation: 303/28R
Family: Metric Tapered Roller Bearings
Bore d: 28 mm
Outside diameter D: 68 mm
Overall width T: 19.75 mm
Inner ring width B: 18 mm
Minimum corner radius r: 1.5 mm
Minimum corner radius r1: 1.5 mm
Dynamic load rating Cr: 66.9 kN
Static load rating C0r: 54 kN
Fatigue load limit Cu: 8 kN
Grease limiting speed: 6,100 rpm
Published row text: 303/28R | 28 | 68 | 19.75 | 18 | 1.5 | 1.5 | 66.9 | 54 | 8 | 6100

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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