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DIN 17200 CK45 40Cr 20MnV6 72mm QT Chromium Plated Piston Rod for Hydraulic Cylinder Name: Chromium plated Piston Rod Type: Solid / Hollow Material: CK45, 20MnV6,42CrMo4, 40Cr D.: 40-400mm W.T: ≥5mm ...