... .ISO 9001:2000 quality 4.NSK,TIMKEN,SKF, OEM service 5.12 year export experience DALIAN BEARING TEST & RESEARCH COMPANY Is at ... : stainless steel,bearing steel, carbon steel,high chrome4.precision: P0,P2,P4,P5,P65.tolerance grade:GB/T307.1---2056.greese/oil ... imported with original packaging11.the process of our own products: 1)assembly 2)windage test 3)cleaning 4)rotary test 5 ...