Threaded Ring Gauge Long Form Calibration Certificate No Material Tool Steel Dimension Type Inch Gauge Type Go/No-Go (Plus/Minus) Pitch Diameter 0.4757 (Go) 0.472 (No-Go) Pitch Diameter - Go Member 0.4757 in Pitch Diameter - No-Go Member 0.472 in Thread Class 2A Thread Length 7/16 in Thread Size 1/2 In.-28 Thread Type UNEF Compatible Holder Size 3T Finish Uncoated Gauge Design Adjustable Hardness RC 60-62 Included Certification Certificate of Accuracy with NIST Traceability