The heart of the HM6420 is a 50” diameter x 66” wide hammermill. The heavy-duty mill features a 1.75” drum skin custom formed from rolled plate. The mill is supported by a 7” main shaft constructed of alloy steel that has been ultrasonic tested. Each pocket within the mill is manufactured from high strength A-514 steel. These combinations create a structural sound mill for added durability and integrity. The mill is equipped with 20 carbide infused hammer inserts built to withstand the toughest material fed into the machine. Each holder is securely attached to the mill via a patent-pending quick change pocket system. Each holder recesses into the mill pocket, increasing durability. A top plate covers the pocket and holds in place by six hex bolts. The hammer insert is attached to each holder utilizing two bolts. With this set-up, the mill hardware is easier and quicker to replace.