BT30 ER Series Tool Holder | 70mm High-Precision Milling Collet Chuck
The BT30 ER Series Tool Holder is a premier industrial-grade collet chuck designed for high-performance CNC milling centers. Engineered with a precision-ground 7:24 taper, this tool holder ensures maximum contact area with the machine spindle, providing exceptional concentricity and vibration dampening during high-speed operations. The integrated keyway design offers an additional layer of security, preventing tool slippage and maintaining precise orientation under high-torque conditions. With a balanced architecture optimized for high-frequency spindles, the 70mm projection length offers the perfect balance between tool reach and structural rigidity. Manufactured from high-grade alloy steel and hardened to ensure long-term durability, these tool holders are essential for maintaining surgical precision in complex milling, drilling, and engraving tasks.
- Precision-ground 7:24 BT30 taper for high-speed stability
- Integrated keyway for secure torque transmission and slip prevention
- Hardened alloy steel construction for superior wear resistance
- High-speed balanced design to minimize spindle vibration
- Excellent runout (T.I.R.) accuracy for improved tool life
- 70mm projection length optimized for various milling depths
- Fully compatible with standard ER20 and ER32 collet systems
Comparative Technical Spindle Motor Configurations Matrix
Use the structural data catalog matrix below to evaluate power outputs, maximum RPM, operating voltages, and cooling styles across standard TriQuench CNC spindle models.
| Spindle Capacity | Operating Speed | Operating Voltage | Cooling System |
|---|---|---|---|
| 12.0 kW | 18,000 RPM | 380 V | Water-Cooled |
| 0.8 kW | 24,000 RPM | 220 V | Air-Cooled (Long Shaft) |
| 3.7 kW | 40,000 RPM | 380 V | Water-Cooled ISO20 |
| 9.0 kW | 18,000 RPM | 380 V | Air-Cooled |
Technical Specifications
| Technical Parameter | Engineering Specification Value |
|---|---|
| MODEL NUMBER | BT30-ER-70 |
| TAPER SIZE | BT30 (7:24 Taper) |
| PROJECTION LENGTH | 70 mm |
| MATERIAL GRADE | 20CrMnTi Alloy Steel |
| HARDNESS RATING | HRC56-58 |
| BALANCING GRADE | G2.5 / 20,000 RPM |
| MECHANICAL | taperRunout: ≤ 0.003 mm | nutCompatibility: ER20 / ER32 (Specified at purchase) | lockingDesign: With Keyway Slot | weight: 0.65 kg (approx) |
Industrial Applications
| Usage Scenario | Target Industry |
|---|---|
| High-Precision CNC Milling and Routing | Machine Tool Manufacturing |
| Precision Engraving and 3D Carving | Precision Die and Mold Engineering |
| Automated Tool Change (ATC) Systems | Aerospace and Automotive Component Shops |
| Industrial Drilling and Tapping Operations | Medical Instrumentation and Fabrication |
| Medical and Aerospace Component Machining | Industrial Robotics and Automation |
| Mold and Die Fabrication | General Engineering |
| High-Speed Spindle Tooling Integration | General Engineering |
Technical FAQ & Operational Guide
What is the benefit of the keyway in the BT30 tool holder?
The keyway ensures the tool holder is locked into the spindle's drive keys, preventing rotational slip. This is critical for high-torque operations or when using specific cutting orientations that require precise alignment.
Is this tool holder suitable for High-Speed Machining (HSM)?
Yes, our BT30 holders are balanced to G2.5 at 20,000 RPM, making them ideal for high-speed spindles. This balancing reduces vibration, protecting both your spindle bearings and cutting tools.
Which ER collets should I use with this holder?
This holder is available in configurations for either ER20 or ER32 collets. Ensure you select the nut size that matches your existing collet sets for optimal compatibility.
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