Threaded Ring Gauge Long Form Calibration Certificate No Material Tool Steel Dimension Type Inch Gauge Type No-Go (Minus) Pitch Diameter 0.7946 in Pitch Diameter - No-Go Member 0.7946 in Thread Class 2A Thread Length 11/16 in Thread Size 7/8 In.-9 Thread Type UNC Compatible Holder Size 5T Finish Uncoated Gauge Design Adjustable Hardness RC 60-62 Included Certification Certificate of Accuracy with NIST Traceability Standards ASME B1.2 Tolerance Class X