Characteristic rolling element frequency, BSF NTN HMK2018L/L118 Drawn cup needle roller bearings

Fw:20 mm; D:27 mm; C1:18 mm; Dw:2.5 mm; Lw:10.8 mm; Lubrication hole on outer ring:Non/No; Inner ring reference:IR17X20X20; Mass:0.02 kg; Cr:13 kN; C0r:17.3 kN; Nlim (grease):8,000 rpm; Min operating temperature, Tmin:-20 °C; Max operating temperature, Tmax:120 °C; Characteristic cage frequency, FTF