The MACK Werkzeuge DIN 6350 is a manual 3-jaw scroll chuck designed for general turning applications on engine lathes. The DIN 6350 designation refers to the German standard for manually operated lathe chuck mounting dimensions — the bolt circle, spigot diameter, and flange dimensions conform to this standard for interchangeability with common lathe spindle noses. MACK Werkzeuge is a German precision clamping tool manufacturer (ISO 9001 certified) based in Sontheim an der Brenz, specializing in lathe chucks sold under the Zentra brand alongside collets, machine vises, and tool holders.

How does a scroll chuck work?

A scroll chuck uses a spiral-shaped scroll plate driven by a chuck key. Turning the key rotates the scroll, which simultaneously moves all three jaws radially inward or outward. This self-centering mechanism ensures the workpiece is automatically centered, making scroll chucks ideal for round and hexagonal stock where quick, repeatable setup is needed.

What is the difference between DIN 6350 and other chuck mounting standards?

DIN 6350 defines the rear-mount flange interface for manual lathe chucks — specifying bolt circle diameter, spigot dimensions, and bolt sizes for each chuck diameter. Other mounting standards include DIN 55026 (camlock), DIN 55027 (bayonet), and direct spindle-nose mounting. A DIN 6350 chuck bolts to a driving plate or adapter that is in turn mounted on the lathe spindle, providing a straightforward and widely compatible mounting solution for toolroom and job shop lathes.