NingBo KaiCheng Bearings Manufacturing Co., Ltd. founded in 1988, It’s specialized in manufacturing deep groove ball bearings, tapered roller bearings, automobile bearings, r minitype series etc. The high speed and low noise bearings is our mainly produces of EMQ bearings. We are own our brand of "CIE", It is of advanced productive technique, consummate device and complete testing means. As well as we have powerful strength for new products, r minitype series and special bearings development. Form last year, We are sales about Seventy million US$ for export, About 90% produce in our factory is for export.

Bearing accuracy Bearing accurany refers to accuracy on and rotation. According to chinese national standard, the bearing accuracy is divided into five classes: Class 0, Class 6, Class 5, Class 4 and Class 2. All of them are equivalent to ISO standard.The comparison of different accuracy classes are shown as follows:

Comparison table of accuracy grade Standard Accuracy Grade GB ISO ANSI SKF DIN JIS 0 0 ABEC1 PO PO 0 6 6 ABEC3 P6 P6 6 5 5 ABEC5 P5 P5 5 4 4 ABEC7 P4 P4 4 2 2 ABEC9 P2 P2 2