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The serial products are made of high quality low carbon alloy steel. The forging quality is strictly controlled by use of the heating patent technology developed independently .The integral mechanical performance is guaranteed through the integral quenching and tempering treatment with the domestically advanced heat treatment technical equipment. The tolerance quality and strength are also well controlled with the rod head digital controlled process. The integral performance of sucker rod is at last guaranteed by means of techniques above. According to API SPEC 11B Polished rods, sinker bars.pony rods, centralizers and couplings of all specifications are available 1. Conventional Sucker Rod, D-grade, Anti-Corrosion Specs(in): 5/8, 3/4, 7/8, 1 Length(m): 7.62, 8.0, 8.5, 9.14 2. Ultra Hi-Strength Sucker Rod, HY Type The HY Type Ultra Hi-Strength Sucker Rod is made from low-carbon alloy steeel, which has fine ***** rod is processed with forging of the ends, hardening and tempering of the full rod, NC processing of the ends and surface quenching of full rod. The rod has a high tensile strength, its bearing capacity is better than D-grade ***** rod has hardened surface, so it is better than D-grade rod in terms of corrosion resistance and abrasion resistance. Specs(in): 5/8, 3/4, 7/8, 1 Length(m): 7.62, 8.0, 8.5, 9.14 3. Hollow Sucker Rod Diluents, corrosion inhibitors, hot oil and so on can be added through inner bore to reduce the viscosity of crude oil and control paraffin buildup in the well, which will help improve the physical property of the wellbore and the efficiency of the pump. The hollow rod is also suitable for sandy oil wells.Due to the fact that the torsion strength of the hollow rod is bigger than that of ordinary rod, it can be used to drive downhole screw pumping ***** hollow rod will facilitate installation of control devices into the well