SKF, NSK, KOYO, NTN TIMKEN LongTeng can supply various roller bearing, ball bearing and auto bearing, including angular contact ball bearing, deep groove ball bearing, spherical roller bearing, self-aligning ball bearing, taper roller bearing, cylindrical roller bearing. Brands: SKF NSK NACHI KOYO NTN IKO and OEM service SKF bearing 6404 belongs to deep groove ball bearing, which is commonly used for supporting axial loads and radial loads. Detailed information of SKF 6404 is following: Inner diameter: 20 mm Outer diameter: 72 mm Thickness: 19 mm Limited speed: 24000 r/min Reference speed: 15000 r/min Mass: 0.40 kgs