AFBMA GradesDiameter Tolerance (µm)Diameter Tolerance (inches)Lot Diameter Variation (µm)Lot Diameter Variation (inches)Basic Diameter Tolerance (µm)Basic Diameter Tolerance (inches)Surface Roughness Ra (µm)Surface Roughness Ra (inches)
30.0750.000003±0.1±0.000005±0.5±0.000020.007±0.0000003
40.10.000004±0.1±0.000004±0.5±0.000020.007±0.0000003
50.1250.000005±0.15±0.000006±1.0±0.000040.008±0.0000003
100.2500.000010±0.25±0.000010±2.5±0.000100.010±0.0000004
150.3750.000015±0.40±0.000015±2.5±0.000100.010±0.0000004
250.6250.000025±0.70±0.000025±2.5±0.000100.010±0.0000004
501.2500.000050±1.25±0.000050±5.0±0.000200.020±0.0000008
1002.5000.000100±2.50±0.000100±10.0±0.000400.020±0.0000015