In CNC machining, the tool holder clamping system directly affects accuracy, stability and tool life. Three mainstream types are compared below.

Mechanical Clamping

Uses collet or physical pressure to hold tools.

Pros: low cost, easy operation, wide application, suitable for roughing

Cons: average concentricity, poor high-speed balance

Use: general machining, daily milling and drilling

Hydraulic Clamping

Uses oil pressure for uniform clamping.

Pros: high concentricity, good vibration damping, stable finishing

Cons: higher cost, not for heavy interrupted cutting

Use: precision machining, mold processing, small tools

Thermal (Shrink-Fit) Clamping

Uses heating and cooling to grip tools tightly.

Pros: ultra-high precision, best for high speed, slim shape

Cons: needs heating machine, high investment

Use: high-speed machining, deep cavity, high-precision parts

Simple Selection Guide

General machining → mechanical

Precision finishing → hydraulic

High-speed & deep cavity → thermal