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

⚡ Quick Technical Datasheet:

Power OutputN/A

Max SpeedN/A

Voltage RatingN/A

Collet InterfaceER Standard

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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.

How is the rotational balancing calibrated on this spindle motor?

Every spindle motor is dynamically balanced in accordance with the ISO 1940 balancing standard to guarantee vibration-free running and maximum stability at high RPMs.

What are the runout tolerances of the shaft and collet interface?

The internal shaft taper maintains a runout accuracy tolerance of under 0.003mm (3 microns), maintaining precise tool concentricity and preventing premature cutter wear.

What cooling precautions are built-in to prevent heat exhaustion?

Built-in temperature dissipation channels support continuous water/liquid cooling circulation or forced fan airflow, preventing thermal expansion of components.

Is this spindle motor compatible with standard VFD inverters and collets?

Yes, the spindle supports direct electrical integration with standard variable frequency drives (VFD) and accepts industrial ER collets (ER11, ER20, ER25, or ER32) to match standard toolholder dimensions.

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BT30 ER Series Tool Holder | 70mm High-Precision Milling Collet Chuck

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

⚡ Quick Technical Datasheet:

Power OutputN/A

Max SpeedN/A

Voltage RatingN/A

Collet InterfaceER Standard

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 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)

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