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The outstanding design and quality construction of Whiting Portable Electric Jacks provide years of dependable service with minimum required maintenance. Portable Electric Jack construction starts with a steel base. Welded to the base is a structural steel column assembly which guides a steel-alloy screw, complete with precision machined buttress threads and a bronze-alloy nut. The jack nut travels on the screw and supports the lifting bracket. The screw is keyed to a worm gear and is supported by a large thrust bearing. The result is a Whiting Portable Electric Jack with dependable load-lifting capacity at any point within the lifting range of the system. Whiting Portable Electric Jacks range from 15 to 60 tons and are optimal for freight and transit rail applications. Key Features Include: All-welded rugged structural steel frame construction Easy and reliable maneuverabilityStandard lower limit and over travel switchBronze-alloy lifting nut designed for long life Sealed bellows offering superior dust and debris protection