Threaded Ring Gauge, Long Form Calibration Certificate No, Material Tool Steel, Dimension Type Inch, Gauge Type Go/No-Go (Plus/Minus), Pitch Diameter 0.5068 (Go), 0.5016 (No-Go), Pitch Diameter - Go Member 0.5068 in, Pitch Diameter - No-Go Member 0.5016 in, Thread Class 2A, Thread Length 3/4 in; 9/16 in, Thread Size 9/16 In.-12, Thread Type UNC, Compatible Holder Size 4T, Finish Uncoated, Gauge Design Adjustable, Hardness RC 60-62