The cool type series uses forced cooling fluid that, when passed through the nut, minimizes heat generation and thermal expansion. Applications:     * Cool type 1 + hollow shaft design:       high speed machine tools and machining center.     * Cool type 2:       electric-driven injection machines, presses, power units and other replaceable hydraulic drives. More Information:     * Model# Guide     * FEM analysis     * Performance analysis Specs:     * Cool type 1     * Cool type 2