Ring Gage,5/16-18 Size,Tool Steel
-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.2712 (No-Go), Pitch Diameter - Go Member 0.2712 in, Thread Class 2A, Thread Length 11/32 in, Thread Size 5/16 In.2752 in, Pitch Diameter - No-Go Member 0.