Threaded Ring Gauge Long Form Calibration Certificate No Material Tool Steel Dimension Type Inch Gauge Type Go/No-Go (Plus/Minus) Pitch Diameter 0.1879 (Go) 0.1845 (No-Go) Pitch Diameter - Go Member 0.1879 in Pitch Diameter - No-Go Member 0.1845 in Thread Class 2A Thread Length 3/16 in Thread Size #12-24 Thread Type UNC Compatible Holder Size 1T Finish Uncoated Gauge Design Adjustable Hardness RC 60-62 Included Certification Certificate of Accuracy with NIST Traceability