介紹：

  Usually,the rings and balls are made of Gcr15 high carton chromium beearing steel (equivalent of JIS G 4805 SUJ2 steel or AISI52100 steel) and 9Cr18 stainless steel(equivalent of AISI440)The shields are made of SPCC or 1Cr18Ni9.The seals are made of synthetic rubber and TeflonThe retainers are made of brass strips H62,SPCC steel,3Cr13,1Cr18Ni9,as well as phenolic resin and plastic.
  1．CROWN RETAINER： The standard metal crown retainer is very light weight, with specially coined ball pockets to reduce torque and provide smooth running characteristics. Material used is 400 series stainless steel.
  2．RIBBON RETAINER： The closed pocket design of the ribbon retainer is the most common type. The material used is 300 series stainless steel. For low torque applications, a loose clinched ribbon retainer may be available.
  3．PHENOLICRETAINER： Plastic crown retainers have the highest speed ratings of any standard retainer type, but have limited availability.