HSK-63F Tool Holders: High-Performance Precision for CNC Machining

What is HSK-63F?

HSK stands for Hohl-Schaft-Kegel, a German standard for hollow taper shanks. The “63” refers to the flange size, while “F” denotes a specific form designed for automatic tool change systems. The HSK-63F interface provides both radial and axial contact, resulting in exceptional rigidity and precision.

✅ What Does HSK-63F Stand For?

HSK: Abbreviation for “Hohl-Schaft-Kegel” (German for Hollow Taper Shank).
63: Indicates the flange diameter in millimeters.
F: Refers to a specific HSK form designed for automatic tool change (ATC) systems without drive keys.

The HSK-63F system uses a short, hollow taper with dual-contact design—meaning it contacts both the spindle taper and face, resulting in higher rigidity and more accurate tool positioning.

🔩 HSK-63F Tool Holder Construction and Material

Material: Case hardened steel
Core tensile strength: Minimum 950 N/mm²
Hardness: HRC 58 ±2
Case depth: 0.8 mm
Surface finish: Anti-corrosion silver finish
Precision class: AT3 taper accuracy

This robust build ensures durability under extreme rotational forces and temperature fluctuations common in high-speed CNC machining.

🚀 Top 7 Benefits of HSK-63F Tool Holders

1. Superior High-Speed Performance

HSK-63F holders are specifically designed for operations above 20,000 RPM. Their lightweight, balanced design reduces centrifugal distortion, allowing stable and vibration-free cutting at ultra-high speeds.

2. Dual-Contact for Maximum Rigidity

Unlike BT or CAT holders, HSK-63F makes contact with both the spindle taper and flange face, which:

Increases rigidity
Reduces axial movement
Improves cutting performance and surface finish

3. Unmatched Repeatability

Thanks to AT3 taper tolerance, HSK-63F ensures:

High concentricity
Low runout (typically <3 µm)
Precise tool changes even after hundreds of cycles

4. Fast and Reliable Tool Changes

HSK-63F is ideal for automatic tool changers (ATC). The symmetrical design and short taper enable:

Lightning-fast engagement and release
Reliable clamping under high load
Reduced machine downtime

5. Wide Range of Tool Compatibility

Available in different styles:

Shrink fit holders
Hydraulic expansion chucks
Collet chucks
Milling adapters
Boring bar blanks

This versatility makes it compatible with most cutting tool geometries and materials.

6. Better Tool Life and Surface Quality

Reduced tool deflection and minimal vibration:

Increase tool life
Decrease tool wear
Provide better machined surface finish

7. Ideal for 5-Axis Machining

Compact and lightweight design makes it suitable for:

Simultaneous 5-axis machining
Multi-sided milling
Precision contouring

🛠️ Typical Technical Specifications

Feature	Specification
Taper Standard	DIN 69893-6, Form F
Flange Diameter	63 mm
Drive Keys	None (Fully Symmetric Design)
Accuracy Class	AT3
Material	Case Hardened Alloy Steel
Surface Treatment	Silver finish (anti-rust coating)
Application RPM	Up to 40,000 RPM
Usage	CNC Milling, Drilling, Engraving

🔧 HSK-63F vs BT, CAT & SK Holders

Feature	HSK-63F	BT / CAT
Contact Type	Dual (Taper + Face)	Taper Only
Speed Capability	Up to 40,000 RPM	Up to 12,000–18,000
Tool Change	Faster, More Accurate	Slower, Less Repeatable
Rigidity	Higher	Moderate
Thermal Stability	Excellent	Average

📌 Best Use Cases for HSK-63F Tool Holders

Aerospace parts with tight tolerances
Medical device component milling
Automotive mold and die applications
Woodworking CNC routers requiring high spindle speeds
High-speed engraving or multi-axis simultaneous machining

💡 Conclusion: Why Choose HSK-63F Tool Holders?

If you’re looking for faster cycle times, better part quality, and reliable tool changes—especially for high-speed, high-precision environments—HSK-63F tool holders are the ultimate choice.

Investing in HSK-63F holders helps manufacturers: