K7074 Class X No-Go Pin Gauge Material Steel Finish Uncoated Diameter 0.3279 in Diameter Increment 0.0001 in Diameter Range 0.2811 in to 0.4060 in Diameter Sub-Range 0.3251 in to 0.3300 in Dimension Type Inch Gauge Type No-Go (Minus) Included Certification Certificate of Accuracy with NIST Traceability Surface Finish 4 Microinch or Better Tolerance 0.00004 in Tolerance Class X Hardness RC 60/65 Long Form Calibration Certificate No Overall Length 2 in Standards ISO 17025