Threaded Ring Gauge Long Form Calibration Certificate No Material Tool Steel Dimension Type Metric Gauge Type Go (Plus) Pitch Diameter 7.324 mm Pitch Diameter - Go Member 7.324 mm Thread Class 6G Thread Length 8.7 mm Thread Size M8 x 1.00 Thread Type Metric Compatible Holder Size 2T Finish Uncoated Gauge Design Adjustable Hardness RC 60-62 Included Certification Certificate of Accuracy with NIST Traceability Standards ASME B1.16M Tolerance Class X