... solid brass cage is used. When the outer diameter of bearing is no more than 400 millimeter, stamped steel cage is used2 ... Bearing Part NO. 6000,6200,6300,6400,6800,6900,16000,62200,62300 & NR ... .4 Material: Chrome steel, Carbon steel, stainless steel and ceramic bearing.5 Special bearings and Nonstandard bearings according to customers' drawings ...