Threaded Ring Gauge, Long Form Calibration Certificate No, Material Tool Steel, Dimension Type Inch, Gauge Type Go/No-Go (Plus/Minus), Pitch Diameter 1.3893 (Go), 1.3812 (No-Go), Pitch Diameter - Go Member 1.721 in, Pitch Diameter - No-Go Member 1.3812 in, Thread Class 2A, Thread Length 1 1/8 in; 3/4 in, Thread Size 1 1/2 In.-6, Thread Type UNC, Compatible Holder Size 6T, Finish Uncoated, Gauge Design Adjustable, Hardness RC 60-62