pherical Roller/ball Bearings 1) 100% made from special 52100 for spherical roller bearings 2) Applicable for the duty and heavy work condition 3) 22000(K) series, 21000(K) series, 23000(K) series and large size bearing. Angular Contact Ball Bearing 1) Series: 3200, 3300, 5200, 5300, 7000, 7200, 7300, 7900 2) Type: A, B, C, DB, DF, DT Extra-Large Size Bearings We have special facilities to produce large, outsize and non-standard bearings, of bore diameters up to 4000mm. Our extra-large bearings are widely used in the metallurgical, electricity generation, construction and defense industries.