1.Size:1.9"~20"2.Material:J55,K55,N80-1,N80-Q,P110 etc.3.Thread:NU,EU,STC,LTC,BTC,VAM TOP and other special thread type.4.Standard:API 5L,API 5CT ,ISO 9001:20085. Surface treatment: Whole phosphating, ... ...
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tubing coupling, casing coupling, coupling blank, coupling stock ...
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