Threaded Ring Gauge Long Form Calibration Certificate No Material Tool Steel Dimension Type Metric Gauge Type No-Go (Minus) Pitch Diameter 6.212 mm Pitch Diameter - No-Go Member 6.21 mm Thread Class 6G Thread Length 8.7 mm Thread Size M7 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