Threaded Plug Gauge Dimension Type Metric Gauge Type Go (Plus) Handle Design Member Only Thread Class 6H Thread Size M18 x 1.50 Thread Type Metric Tolerance Class X Gauge Finish Chrome Plated Gauge Length - Go Member 22.20 mm Gauge Material Tool Steel Hardness RC 70-72 Included Certification Certificate of Accuracy with NIST Traceability Pitch Diameter - Go Member 17.03 mm Standards ASME B1.16M Thread Direction Right Hand