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Free-Running Inserts Free-Running Insertsis a high-precision surface of the cold-ro...
size:1/16"-16" The abbreviation of the NPT is National (American) Pipe Thread, 60 de...
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buttress thread specification oilfield seamless casing coupling standard API SPEC...
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API 2 7/8 and 2 7/8 EUE*NU K55/J55 tubing crossover coupling TIANJIN DALIPU OIL COUN...
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