Threaded Ring Gauge Long Form Calibration Certificate No Material Tool Steel Dimension Type Metric Gauge Type Go/No-Go (Plus/Minus) Pitch Diameter 2.188 mm (Go) 2.117 mm (No-Go) Pitch Diameter - Go Member 2.188 mm Pitch Diameter - No-Go Member 2.117 mm Thread Class 6G Thread Length 4 mm Thread Size M2.5 x 0.45 Thread Type Metric Compatible Holder Size 1T Finish Uncoated Gauge Design Adjustable Hardness RC 60-62