WQK deep groove ball bearing 1.WQK ball bearing 2.ball bearing manufacturer 3.good quality fair price 4.OEM service Deep groove Ball Bearing / Ball bearing / Bearing for machine1. Main products:6000series, 6100series, 6200series, 6300series, 6400serice, 6900series and non-standard series2. Material: Gcr15, Gcr15Simn, G20Cr2Ni4A, Gr18Mo3. Inner diameter: 1 - 250 mm4. Application: Gearbox, ...