JTEKT/Koyo DB matched pair · live catalog page 20
7921CDB FY
Manufacturer-published matched-pair dimensions, load ratings, fatigue limit, and limiting speed.
Live manufacturer specification row
Published specifications
- Designation
- 7921CDB FY
- Arrangement
- Back-to-back matched pair (DB)
- Bore d
- 105 mm
- Outside diameter D
- 145 mm
- Pair width B
- 40 mm
- Minimum corner radius r
- 1.1 mm
- Minimum corner radius r1
- 0.6 mm
- Dynamic load rating Cr
- 115 kN
- Static load rating C0r
- 123 kN
- Fatigue load limit Cu
- 5.75 kN
- Factor f0
- 16.4
- Grease limiting speed
- 5,300 rpm
- Published row text
- 7921CDB FY | 105 | 145 | 40 | 1.1 | 0.6 | 115 | 123 | 5.75 | 16.4 | 5300
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
DB matched pair7021BDB FYD 160 mm · pair width 52 mmDB matched pair7021DB FYD 160 mm · pair width 52 mmDB matched pair7021CDB FYD 160 mm · pair width 52 mmDB matched pair7221BDB FYD 190 mm · pair width 72 mmDB matched pair7221DB FYD 190 mm · pair width 72 mmDB matched pair7221CDB FYD 190 mm · pair width 72 mmDB matched pair7321BDB FYD 225 mm · pair width 98 mmDB matched pair7321DB FYD 225 mm · pair width 98 mm