Threaded Ring Gauge, Long Form Calibration Certificate No, Material Tool Steel, Dimension Type Inch, Gauge Type Go/No-Go (Plus/Minus), Pitch Diameter 0.4485 (Go), 0.4435 (No-Go), Pitch Diameter - Go Member 0.4485 in, Pitch Diameter - No-Go Member 0.4435 in, Thread Class 2A, Thread Length 7/16 in, Thread Size 1/2 In.-13, Thread Type UNC, Compatible Holder Size 3T, Finish Uncoated, Gauge Design Adjustable, Hardness RC 60-62, Included Certification Certificate of Accuracy with NIST Traceability