1. Basic Definitions

BT Tool Holders and SK Tool Holders are commonly used types of tool holders in CNC machining. Their designs and applications differ, making them suitable for various machining needs.

2. Specific Parameter Differences

1. Tool Holder Structure

   • BT Tool Holder: Features a self-locking structure that provides more stable tool fixation, suitable for high-speed and high-precision machining.
   • SK Tool Holder: Uses a traditional flat contact structure, with a locking mechanism that is less sophisticated, suitable for moderate speed and standard machining.

2. Precision

   • BT Tool Holder: Generally offers higher precision, with spindle runout precision reaching ±0.005mm.
   • SK Tool Holder: Precision is relatively lower, with spindle runout precision typically around ±0.01mm.

3. Applicable Range

   • BT Tool Holder: Widely used in high-speed, high-precision milling, drilling, and other machining applications.
   • SK Tool Holder: Suitable for general milling, drilling, and cutting operations.

4. Cooling Method

   • BT Tool Holder: Typically designed with internal cooling channels, which help enhance tool life and machining quality.
   • SK Tool Holder: Mostly relies on external cooling, resulting in relatively less effective cooling.

3. Usage Conditions and Application Scenarios

1. BT Tool Holder

   • Usage Conditions: Suitable for use in high-speed machining centers, especially in environments requiring long continuous operation.
   • Application Scenarios: Aerospace, automotive manufacturing, mold processing, and other fields that demand high precision and surface quality.

2. SK Tool Holder

   • Usage Conditions: Suitable for lower-speed and heavier-load machining environments.
   • Application Scenarios: General machining, conventional manufacturing industries, and routine maintenance.

BT and SK tool holders each have their own advantages in CNC machining. The BT tool holder is better suited for high-precision, high-efficiency applications, while the SK tool holder is ideal for traditional machining needs. Choosing the appropriate tool holder type can significantly improve machining quality and efficiency.