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A BT-ER holder is a high-precision tool holder used in CNC milling machines to hold cutting tools securely.

  • BT refers to the spindle taper (e.g., BT30, BT40, BT50), standardized for tool holding systems.

  • ER refers to the collet system (e.g., ER11, ER16, ER32), which provides clamping flexibility for various tool shank sizes.