... abrasion resistance with material Model: PTFE.4) Gear material of gear box is 42CrMO,High-frequent quenching, hardness: ... HRC 40-45,precision of gear grinding : Class 6 Machine picture: Kinds of Package ... , main products of which : single-column vertical lathe, double-column vertical lathe and CNC vertical lathe with advanced and aesthetic design, reliable function, ...