1 1/2 inch-11 1/2 ANPT (Aeronautical National Pipe Taper (thread gauge)) BASIC L-1 RING GAGE Class X NIST traceable Tool steel RC 60/62 (cold stabilized) shipped in polly bag certificate of accuracy with each ring (these gages are manufactured to order delivery is 5 weeks aprox). Certificate of Accuracy is included.Click HERE to read about additional Long Form Cert.
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