Additional ball specification £º ball roundness : 0.0001 inch (0.003 mm) maximum; ball surface roughness : 5RA
maximum; tolerance shall to be ¡À0.001 inch (¡À0.025mm) for all ball diameter less than 2-inchs; tolerance shall to
be ¡À0.002 inch (¡À0.050mm) for all ball diameter not less than 2-inchs(precision grade : excess or equal to 25).