A straight shank extension rod is a commonly used tool auxiliary component in the field of mechanical machining, mainly used to extend the effective working length of the tool to meet the needs of special machining scenarios such as deep cavities and deep holes.

Its structure is usually designed with a straight handle, with one end connected to the spindle or handle of the machine tool, and the other end used to install cutting tools or clamps (such as ERM, ER series clamps). Through precise dimensional parameters (such as handle diameter, total length, fitting length, etc.), it ensures stable adaptation to the machine tool and cutting tool, ensuring accuracy and rigidity during the machining process.

Common models are often distinguished based on the type of chuck, shank specifications, and length they are compatible with (such as C8-ER8M-55, C10-ER11A-100, etc.), and are widely used in CNC milling, drilling, and other machining processes. They are important tools for improving machining flexibility and adaptability.