A4059/138

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

Bore d14.989 mmOutside diameter D34.988 mmOverall width T10.998 mmDynamic rating Cr15.7 kNKoyo calculation tool ↗

Live manufacturer specification row

Published specifications

Inch family

Designation: A4059/138
Family: Inch Tapered Roller Bearings
Bore d: 14.989 mm
Outside diameter D: 34.988 mm
Overall width T: 10.998 mm
Inner ring width B: 10.988 mm
Minimum corner radius r: 0.8 mm
Minimum corner radius r1: 1.2 mm
Dynamic load rating Cr: 15.7 kN
Static load rating C0r: 11.9 kN
Fatigue load limit Cu: 1.55 kN
Grease limiting speed: 12,000 rpm
Published row text: A4059/138 | 14.989 | 34.988 | 10.998 | 10.988 | 0.8 | 1.2 | 15.7 | 11.9 | 1.55 | 12000

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.