Threaded Ring Gauge Long Form Calibration Certificate No Material Tool Steel Dimension Type Inch Gauge Type No-Go (Minus) Pitch Diameter 0.3287 in Pitch Diameter - No-Go Member 0.3287 in Thread Class 2A Thread Length 7/16 in Thread Size 3/8 In.-16 Thread Type UNC Compatible Holder Size 3T Finish Uncoated Gauge Design Adjustable Hardness RC 60-62 Included Certification Certificate of Accuracy with NIST Traceability Standards ASME B1.2 Tolerance Class X