Threaded Ring Gauge Long Form Calibration Certificate No Material Tool Steel Dimension Type Inch Gauge Type No-Go (Minus) Pitch Diameter 1.1879 in Pitch Diameter - No-Go Member 1.1879 in Thread Class 2A Thread Length 3/4 in Thread Size 1 1/4 In.-12 Thread Type UNF 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