Threaded Ring Gauge Long Form Calibration Certificate No Material Tool Steel Dimension Type Inch Gauge Type Go/No-Go (Plus/Minus) Pitch Diameter 0.525 (Go) 0.5205 (No-Go) Pitch Diameter - Go Member 0.525 in Pitch Diameter - No-Go Member 0.5205 in Thread Class 2A Thread Length 9/16 in Thread Size 9/16 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