Threaded Ring Gauge Long Form Calibration Certificate No Material Tool Steel Dimension Type Inch Gauge Type Go/No-Go (Plus/Minus) Pitch Diameter 0.9168 (Go) 0.91 (No-Go) Pitch Diameter - Go Member 0.9168 in Pitch Diameter - No-Go Member 0.91 in Thread Class 2A Thread Length 15/16 in Thread Size 1 In.-8 Thread Type UNC Compatible Holder Size 5T Finish Uncoated Gauge Design Adjustable Hardness RC 60-62 Included Certification Certificate of Accuracy with NIST Traceability