Threaded Plug Gauge Dimension Type Inch Gauge Type No-Go (Minus) Handle Design Member Only Thread Class 2B Thread Size 1/4 In.-20 Thread Type UNC Tolerance Class X Gauge Finish Chrome Plated Gauge Length - No-Go Member 5/16 in Gauge Material Tool Steel Hardness RC 70-72 Included Certification Certificate of Accuracy with NIST Traceability Pitch Diameter - No-Go Member 0.2224 in Standards ASME B1.2 Thread Direction Right Hand