Sichuan Dongzhou Bearing Co.,Ltd is located in the brilliant ancient culture town-Guanghan city Sichuan province.38km distant from Chengdu city and 20km from Deyang city. The company covers an area of 65000 square meters, building area of 30000 square meters. Now there are 60 professional and technical personnel. It has a 40 years history to engage in STZ brand bearing research and development, manufacturing, sales and service. There are about 500 sets production and inspection equipments. And it owns the advanced, perfect physics and chemistry, metrologh, inspecting facilities and ways.It can produce more than 600 varieties bearings per year. The main production are: 1. The inner diameter of 12mm~140mm, all kinds of insert units and pillow blocks; 2. The outer diameter of 200mm~1600mm, all kinds of large and extra-large bearings. Especially the four row cylindrical roller bearings in the rolling mill, angular contact ball bearings, four row circular cone roller bearings, thrust roller