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High Quality Hydraulic Hollow Jack Post Tension Jack for Sale. Wide Tonnage Range: Available from 420KN to 6500KN to meet various construction needs. Customizable Voltage: Standard 380V/50Hz/3phase, with voltage customizable per equipment. OEM Service Available: Professional design team supports OEM orders and custom designs. Fast Delivery: Normal goods delivered in 3-5 days; non-standard items in 25-30 days. Comprehensive Warranty: One-year warranty with technical support available as needed. Free Spare Parts: Spare parts are provided free of charge for the machines. High Precision Design: Hydraulic system ensures accurate force application for prestressing. Multiple Certifications: Products certified with RoHS, ISO, and CE standards.