30306JR

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

Bore d30 mmOutside diameter D72 mmOverall width T20.75 mmDynamic rating Cr74.4 kNKoyo calculation tool ↗

Live manufacturer specification row

Published specifications

Metric family

Designation: 30306JR
Family: Metric Tapered Roller Bearings
Bore d: 30 mm
Outside diameter D: 72 mm
Overall width T: 20.75 mm
Inner ring width B: 19 mm
Minimum corner radius r: 1.5 mm
Minimum corner radius r1: 1.5 mm
Dynamic load rating Cr: 74.4 kN
Static load rating C0r: 60.1 kN
Fatigue load limit Cu: 9 kN
Grease limiting speed: 5,800 rpm
Published row text: 30306JR | 30 | 72 | 20.75 | 19 | 1.5 | 1.5 | 74.4 | 60.1 | 9 | 5800

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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