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This piston rod has two kinds, one is: thermal refining and high frequency, the other: thermal refining, high frequency and chroming.The hardness reach to HRC58-62, Each liner is highly degree of finish. Especially after plating chromium the piston rod has a strong corrosion resistance and wear resistance , which is widely used for duplex mud pump. At present our piston rods, such as API 1# 3# 4# 5# 6#, have high mechanical strength, good stability. Our products export with locknut, well received by users.
