Friction: To ensure the quality of the production line assembly work, and can be controlled and to achieve consistency. You must consider the impact generated by friction joints. As friction screw bearing surface, thread, and gaskets caused. In the process of tightening the screws, usually 90% torque loss due to friction can really tighten the screw axis force torque generated, only 10%

Durability of the oil seal low pressure oil; a simple configuration can produce highly efficient pulse; protective cover; direct short-term organ, has patented a newly developed breathe organ; protective pouches Ergonomically manufacturing; low pressure valve easy external adjustment; patent-pending modular hydraulic pull axis.

Material: Material decide what type of screws or tightening tool and screwed tight size forces, the most commonly used material for iron, aluminum, plastic and wood, such as different species.