... bronze. 6.LubricationThrust ball bearings mostly work in the condition of heavy load, low speed, so generally it is extremely ... to impose filling lubrication. The grease we commonly use concludes calcium grease, lithium grease, and high temperature grease, etc.Company ... District, Qingdao city ,Shandong province, China 2012 High precision and low noise minature ball bearings liaocheng manufacuter