ER collet extension rod

ER drilling spindles are essential core components of multi-spindle drilling machines, CNC lathes, CNC milling machines, and automatic lathes,

primarily used to clamp drill bits, reamers, or tapping tools.

ER collets ensure machining accuracy and clamping force, and are available in single-head and double-head designs,

selected according to the appropriate machining requirements.

Nut types: Primarily divided into Type A (hexagonal nut) and Type M (torch nut).

Machines with limited space (such as Swiss-type lathes) often use smaller diameter Type M nuts to prevent interference.