A 4-jaw independent chuck C Type is a specialized lathe chuck designed for holding irregular, square, or asymmetrical workpieces. The "C Type" design represents a bolt-locking joint layout that mounts directly to short circular cone spindles.

Based on how they connect to the machine tool spindle, short circular cone shape chucks can be classified into Type A (joined with screws), Type C (bolt locking joint), and Type D (pull connection).

Independent chucks allow each jaw to adjust separately. This provides the flexibility to clamp non-cylindrical workpieces and perform precise off-center adjustments that standard self-centering 3-jaw chucks cannot achieve.

Type C chucks are best suited for heavy-duty turning and precision machining operations where a rigid, direct-to-spindle lock is necessary to handle high rotational forces and heavy workpieces.

To maintain accuracy and longevity, clean the chuck guide slots regularly to remove metal shavings, and apply recommended chuck lubrication to the jaw adjustment screws and sliding interfaces.