The frame of the cutting machine uses cast iron which is produced in Kawaguchi City, Saitama Prefecture.
The cast iron used is produced by the Meehanite manufacturing method, and boasts a tenacious and tough property while improving the peak value of hardness due to the unique alloying element content obtained through many years of research. Also, due to its high damping capacity, it quickly absorbs vibration and suppresses machine wear. This is the reason why the Nagai cutting machine lasts a long time.