18685/20

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

Bore d44.45 mmOutside diameter D79.375 mmOverall width T17.462 mmDynamic rating Cr59.2 kNKoyo calculation tool ↗

Live manufacturer specification row

Published specifications

Inch family

Designation: 18685/20
Family: Inch Tapered Roller Bearings
Bore d: 44.45 mm
Outside diameter D: 79.375 mm
Overall width T: 17.462 mm
Inner ring width B: 17.462 mm
Minimum corner radius r: 2.8 mm
Minimum corner radius r1: 1.6 mm
Dynamic load rating Cr: 59.2 kN
Static load rating C0r: 59.1 kN
Fatigue load limit Cu: 8.65 kN
Grease limiting speed: 4,800 rpm
Published row text: 18685/20 | 44.45 | 79.375 | 17.462 | 17.462 | 2.8 | 1.6 | 59.2 | 59.1 | 8.65 | 4800

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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