615/612

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

Bore d44.45 mmOutside diameter D120.65 mmOverall width T41.275 mmDynamic rating Cr218 kNKoyo calculation tool ↗

Live manufacturer specification row

Published specifications

Inch family

Designation: 615/612
Family: Inch Tapered Roller Bearings
Bore d: 44.45 mm
Outside diameter D: 120.65 mm
Overall width T: 41.275 mm
Inner ring width B: 41.275 mm
Minimum corner radius r: 3.6 mm
Minimum corner radius r1: 3.2 mm
Dynamic load rating Cr: 218 kN
Static load rating C0r: 217 kN
Fatigue load limit Cu: 34 kN
Grease limiting speed: 3,500 rpm
Published row text: 615/612 | 44.45 | 120.65 | 41.275 | 41.275 | 3.6 | 3.2 | 218 | 217 | 34 | 3500

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.

Related Koyo bearings