The American Petroleum Institute (API) establishes a controlled gaging program to insure API thread form specifications are met in the production of oil field equipment, tools and pipe. API requires that those manufacturers using the API monogram inspect these components with working gages set to API master gages. We are licensed by the Institute to use the API monogram on all the API Spec 5B, Spec 7-2 and Spec 11B Master gages we sell.
You can downlaod our Gauge catalog for more detail, any enquiry please send email at sales@chinabestools.com, or call at +86-1380540684(Wechat number).
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