Threaded Ring Gauge Long Form Calibration Certificate No Material Tool Steel Dimension Type Metric Gauge Type Go (Plus) Pitch Diameter 1.354 mm Pitch Diameter - Go Member 1.354 mm Thread Class 6G Thread Length 2.4 mm Thread Size M1.6 x 0.35 Thread Type Metric Compatible Holder Size 1T Finish Uncoated Gauge Design Adjustable Hardness RC 60-62 Included Certification Certificate of Accuracy with NIST Traceability Standards ASME B1.16M Tolerance Class X