1. Support for the upgrading and mechanical loading.
2. The screw pistons has resistant coating layer, inside of the cylinder body is plated with hard chromium.
3. Absolute mechanical locking load.
4. High-temperature baking, the surface is corrosion and impact-resistant.

This jack combined with the functions of the other jacks, mechanical jack carry the security is suitable for the piston continued to support the load of work for a long-time stretch.