SUJ2 Steel Ball

The standard of manufacturingSUJ2 steel ballcomplies with the following: 1.GB/T 308-2002 rolling bearing-steel ball. 2.JB/T1225-2001 specification for heat-treatment of rolling bearing parts made from high carbon chromium bearing steel. 3.JB/T 8923-1999 rolling bearing steel-specifications of vibration(acceleration) for steel ball. 4.JB/T53404.2-1994 supplementary stipulation for standard photograph atlas about surface quality of steel ball. 5.CSBTS TC98.62-1999 rolling bearing-processing remainder and tolerance of steel ball. 6.CSBTS TC98.63-1999 rolling bearing-specification for surface roughness of steel ball.