If you're trying to lift something heavy, a jack can be incredibly useful, if not necessary, but do you need a screw jack or a hydraulic jack?

The ActionJac line of bevel gear screw jack systems is offered from Nook Industries, innovator of linear motion components and systems. Available in many configurations, this line offers customers ...

And the worm gears are precision ground. The jacks come in a variety of sizes with maximum load capacities ranging from ¼ to 100 tons.