Threaded Ring Gauge, Long Form Calibration Certificate No, Material Tool Steel, Dimension Type Inch, Gauge Type Go (Plus), Pitch Diameter 0.5967 in, Pitch Diameter - Go Member 0.5967 in, Thread Class 2A, Thread Length 9/16 in, Thread Size 5/8 In.-24, Thread Type UNEF, Compatible Holder Size 4T, Finish Uncoated, Gauge Design Adjustable, Hardness RC 60-62, Included Certification Certificate of Accuracy with NIST Traceability, Standards ASME B1.2, Tolerance Class X