Threaded Ring Gauge Long Form Calibration Certificate No Material Tool Steel Dimension Type Inch Gauge Type Go/No-Go (Plus/Minus) Pitch Diameter 1.1941 (Go) 1.1879 (No-Go) Pitch Diameter - Go Member 1.1941 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