Frmin=Kr(6+4n/nr)(dm/100)2
where
Frmin minimum radial load (N)
Kr minimum load factor
Kr=100 for series 10
Kr=150 for series 2, 3, 4
Kr=200 for series 22
Kr=250 for series 23
n actual rotating speed (r/min)
nr limit of rotating speed (r/min)
dm mean diameter dm=0.5(d+D)(mm)