Threaded Ring Gauge Long Form Calibration Certificate No Material Tool Steel Dimension Type Metric Gauge Type Go (Plus) Pitch Diameter 11.324 mm Pitch Diameter - Go Member 3.089 mm Thread Class 6G Thread Length 11.1 mm Thread Size M12 x 1.00 Thread Type Metric Compatible Holder Size 3T Finish Uncoated Gauge Design Adjustable Hardness RC 60-62 Included Certification Certificate of Accuracy with NIST Traceability Standards ASME B1.16M Tolerance Class X