Question

Which 6400 series bearing will be best suitable for a radial load of 1.8 kN with operation at 1200 rpm for 2000 hours? Loading is steady. Basic dynamic capacities of various 6400 series bearing are:

Bearing	6401	6402	6403	6404
Dynamic Capacity	5300 N	6000 N	7350 N	9800 N

• A. 6403 bearing
• B. 6402 bearing
• C. 6401 bearing
• D. 6404 bearing

Answer 1

The correct option is D 6404 bearing

$L_{10}=\frac{60N{L}_h}{{10}^6}=\frac{60\times 1200\times 2000}{{10}^6}$ = 144 million resolutions
$L_{10}={\left(\frac{C}{P}\right)}^3$
$144={\left(\frac{C}{1.8}\right)}^3$
$\Rightarrow C=9.434KN=9434N$

$\therefore$ 6404 bearing is best suitable .