40,000RPM Balance toolholder ISO20-ER20 collet chuck tools holder CNC lathe engraving machine

Specification Overall Clamping Precision (A): ≤0.008mm Overall Clamping Precision (B): ≤0.005mm Product Precision (A): 0.003 mm Product Precision (B): 0.002 mm Material: High-quality steel 20CrMnTi Hardness: > HRC 55 degrees Roundness: 0.8u Carburizing depth: > 0.8 mm Surface roughness: > 0.8mm Standard Speed: 40000 RPM~50000 RPM