JTEKT/Koyo DB matched pair · live catalog page 12
7909CDB FY
Manufacturer-published matched-pair dimensions, load ratings, fatigue limit, and limiting speed.
Live manufacturer specification row
Published specifications
- Designation
- 7909CDB FY
- Arrangement
- Back-to-back matched pair (DB)
- Bore d
- 45 mm
- Outside diameter D
- 68 mm
- Pair width B
- 24 mm
- Minimum corner radius r
- 0.6 mm
- Minimum corner radius r1
- 0.3 mm
- Dynamic load rating Cr
- 33.7 kN
- Static load rating C0r
- 28.2 kN
- Fatigue load limit Cu
- 1.55 kN
- Factor f0
- 16
- Grease limiting speed
- 12,000 rpm
- Published row text
- 7909CDB FY | 45 | 68 | 24 | 0.6 | 0.3 | 33.7 | 28.2 | 1.55 | 16 | 12000
Verification boundary
What still needs to match
Arrangement and contact angleConfirm DB arrangement, contact angle, precision, preload, and complete suffix.
Fits and geometryVerify shaft/housing seats, shoulders, fillets, spacers, and axial clamping.
DutyCheck combined radial/axial load, stiffness, speed, lubrication, temperature, and required life.
Current dataUse the linked JTEKT/Koyo calculation and CAD tools before ordering.
Related Koyo DB pairs
Same bore dimension
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