We are pleased to introduce that we are the ISO 9001 certified u-joint manufacture with our own professional machine equipments in Hangzhou, China. Our main producing technique and in section standard are from the coopeation and technical transfer of original technician. We are also the OEM supplier for our worldwide customer. Our material for spider and bearing caps is 20Cr alloy steel (hardness after heat treatment is HRC 58-64 ), our material for needle roller bearing is Gcr15 high carbon steel( hardness after heat treatment is HRC 58-64) , There is one patent cross shape grease channel design inside our each bearing cap. we hope you can visit our company and factories in Hangzhou, we will show you our process of producing u-joints and inspection standard, etc. that will let you understand and have more confidence in our products.