CNC Horizontal Machining Center (HMC) machines are specialized machines that are used to machine a variety of different materials, including metals, plastics, and composites. They are used in a wide range of industries, including aerospace, automotive, and industrial manufacturing. The best-selling CNC Horizontal Machining Center machines can vary depending on the specific application, industry, and region. However, some popular and widely used models include:

1. Mazak HCN-6800 – Mazak is a well-known brand in the CNC machining industry, and their HCN-6800 machines are known for their high precision, efficiency, and versatility. They offer a wide range of models for different applications and industries.
2. DMG MORI NHX Series – DMG MORI is another well-known brand in the CNC machining industry, and their NHX series machines are known for their high precision and reliability. They offer a wide range of models for different applications and industries.
3. Okuma MA-Series – Okuma is a well-known brand in the CNC machining industry, and their MA-series machines are known for their high precision and durability. They offer a wide range of models for different applications and industries.
4. Mori Seiki NHX Series – Mori Seiki is a well-known brand in the CNC machining industry, and their NHX series machines are known for their high precision and productivity. They offer a wide range of models for different applications and industries.