... (μm)Ra(μm)101/16”~1”0.250.250.500.025281/16”~1”0.70.71.400.050401/16”~1”1.001.002.000.080601/16”~1”1 ... ”~1”12.7012.7025.40-10001/16”~1”25.4025.4050.80- GradeAvailable Size RangeGauge Interval(μm)Preferred Gauge(μm)101/16”~1”1-10,…..,-1,0,+1 ... ,…..,+9281/16”~1”2.00-12,…..,-2,0,+2 ...