HT200 / HT300 Gray Iron Machine Tool Castings High Stability & Vibration Damping Cast Iron Components for Machine Tools Our HT200 and HT300 gray iron machine tool castings are widely recognized as the most reliable structural parts for precision machinery and industrial equipment. Manufactured from high-grade gray cast iron material, these castings feature excellent vibration absorption, high rigidity, stable structure, and good thermal stability, perfectly suited for lathes,