Threaded Ring Gauge, Long Form Calibration Certificate No, Material Tool Steel, Dimension Type Inch, Gauge Type Go/No-Go (Plus/Minus), Pitch Diameter 0.5875 (Go), 0.5828 (No-Go), Pitch Diameter - Go Member 0.5875 in, Pitch Diameter - No-Go Member 0.5828 in, Thread Class 2A, Thread Length 9/16 in, Thread Size 5/8 In.-18, Thread Type UNF, Compatible Holder Size 4T, Finish Uncoated, Gauge Design Adjustable, Hardness RC 60-62, Included Certification Certificate of Accuracy with NIST Traceability