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