Keystone Engineering & Manufacturing

By producing our products in house, Keystone has the ability to guarantee a top quality product and gives us the ability to react quickly to our customer's needs. Keystone Engineering was founded in 1980 after successfully designing the first quick-change drum system for the asphalt milling industry. The Milling Industry's First Quick-Change Drum Built by Keystone in 1979. The Milling Industry's First Micro-Milling Drum Built by Keystone in 1987. All of Keystone Engineering's products are proudly engineered and produced at our Avon, Indiana facility, using the latest design and manufacturing technology that is available. Keystone Engineering is the leading innovator of tooling systems and drum designs for grinding equipment and has a long standing reputation for excellent quality and customer service. The Flatliner can deliver precise depth control, cutting widths of 2" to 49" and with 100% surface coverage.