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Pipe couplings in strict accordance with the American petroleum institute APISPEC5CT and 5 B standard production, material selection through authentication of large-scale enterprise pipe API, steel grade J55 N80 L80 including P110, thread processing using the domestic first-class numerical control lathe, import molding tool a complete processing, the accuracy of all accord with API standard, and close to zero error, to ensure the universality and interchangeability of threads; Testing equipment using a precise thread gauges, hardness tester nondestructive phosphorus powder scratches instrument and taper gear tooth type high pitch a single thread measurement instrument, and ensure that the product rate of 100%. |
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