Internal cold ER collet
Custom Internal Coolant ER Collet is designed for high-precision CNC machining requiring effective cooling and stable tool clamping. Its internal coolant-through design delivers coolant directly to the cutting edge, improving heat control, chip evacuation, and machining stability during high-speed operations.Made from heat-treated spring steel, it offers strong elasticity, low runout, and reliable clamping force. Compatible with standard ER systems, it supports customization in size, coolant holes, and tolerance grades.Ideal for precision milling, drilling, and tapping in demanding applications.