Threaded Ring Gauge Long Form Calibration Certificate No Material Tool Steel Dimension Type Inch Gauge Type Go/No-Go (Plus/Minus) Pitch Diameter 0.2752 (Go) 0.2712 (No-Go) Pitch Diameter - Go Member 0.2752 in Pitch Diameter - No-Go Member 0.2712 in Thread Class 2A Thread Length 11/32 in Thread Size 5/16 In.-18 Thread Type UNC Compatible Holder Size 2T Finish Uncoated Gauge Design Adjustable Hardness RC 60-62 Included Certification Certificate of Accuracy with NIST Traceability