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上海宝钢集团公司钢管分公司研制出Φ１０２ｍｍ (４″)圆螺纹套管（带接箍）和Φ１０２ｍｍ（４″）直连型套管产品。其中 ,Φ１０２ｍｍ圆螺纹套管采用螺距为每口寸八扣的ＡＰＩ圆螺纹连接 ,接箍公称直径为１１２ｍｍ。Φ１０２ｍｍ直连型套管采用螺距为每口寸八扣的偏梯形螺
Shanghai Baosteel Group Corporation Steel Pipe Branch has developed Φ102mm (4 “) round threaded sleeve (with coupling) and Φ102mm (4”) straight-connected sleeve products. Among them, the Φ102mm round threaded casing with a pitch of eight holes per inch API threaded connection, coupling nominal diameter of 112mm. Φ102mm straight type casing with a pitch of eight buckle for each port of the partial trapezoidal screw