WuXi Free Petroleum Pipe Manufacture Co., Ltd.

The leading manufacturer and supplier of casing and tube couplings in China.With reliable chemical composition and mechanical analysis, strict precision in size, and quality stability, we produce couplings to casing and tubing according to API standards and special threading products according to customers requirements. 1.Round Thread Casing Couplings A.Size Designation:4-1/2 5 5-1/2 6-5/8 7 7-5/8 8-5/8 9-5/8 10-3/4 11-3/4 13-3/8 B.Grade:H40 J55 K55 N80 L80 P110 2.Buttress Thread Casing Couplings A.Size Designation:4-1/2 5 5-1/2 6-5/8 7 7-5/8 8-5/8 9-5/8 10-3/4 11-3/4 13-3/8 B.Grade:H40 J55 K55 N80 L80 P110 3.Nonupset Tubing Couplings A.Size Designation:2-3/8 2-7/8 3-1/2 4 4-1/2 B.Grade:H40 J55 K55 N80 L80 P110 4.Upset Tubing Couplings A.Size Designation:2-3/8 2-7/8 3-1/2 4 4-1/2 B.Grade:H40 J55 K55 N80 L80 P110 [Details]