Tapered Roller Bearing Detail: 1.material: bearing steel 2.Certificate:ISO9001:2000 3.delivery time : ... ,51200,51300, Inch and metric series etc.MaterialChrome Steel ,GCr15,Carbon steel,Stainless steelNoise standardZ1, Z2, Z3, Z4Quality standardISO ... Rust prevention9.Product packaging Company Profileqinngdao rich Bearing Manufacturing Co., Ltd. is a specialized enterprise for the production of tapered ...