NTN 7903UADG/GLP42U3G super-precision Angular contact ball bearings

d:17 mm; D:30 mm; B:7 mm; d1:21.3 mm; d2:20.3 mm; D1:25.7 mm; D2:27.7 mm; a:9 mm; Contact angle α:25 °; rs min:0.3 mm; r1s min:0.15 mm; f0:15.1; Precision class:P42; Mass:0.02 kg; Brand:NTN; Dynamic load, C:5.1 kN; Static load, C0:3.05 kN; Nlim (oil):69,800 rpm; Nlim (grease):43,200 rpm; Preload lev