Threaded Ring Gauge Long Form Calibration Certificate No Material Tool Steel Dimension Type Inch Gauge Type Go (Plus) Pitch Diameter 1.3893 in Pitch Diameter - Go Member 10.829 in Thread Class 2A Thread Length 1 1/8 in Thread Size 1 1/2 In.-6 Thread Type UNC Compatible Holder Size 6T Finish Uncoated Gauge Design Adjustable Hardness RC 60-62 Included Certification Certificate of Accuracy with NIST Traceability Standards ASME B1.2 Tolerance Class X