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Mud Pump Piston Rod 42CrMo or Bomco F500 F800 F1000 F1300 F1600. Made of high-strength alloy steel with integral forging, excellent tensile strength for heavy-load mud pump operation. Surface blackening treatment delivers strong wear resistance, rust resistance and mud corrosion resistance. One-step forming structure with integrated flange and thread, avoiding fracture under reciprocating impact load.