HGT precision bearing can be divided into four series: 618 series, 619 series, 718 series, 719 series. The inner diameter range from 100mm to 950mm, and the accuracy class is divided into P6, P5, P4, and P2. For High-speed Precision Angular Contact Ball Bearings, the standard accuracy is ISO4 (equivalent to ABEC 7 of the American Bearing Manufacturers Association); we can also produce bearings with the class of P4A (The dimensional accuracy comparable to ISO4, rotation accuracy is higher ISO4) as well as Super Precision Bearings which can achieve the type of ISO02 (equivalent to ABEC9).