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SK40-APU16 Precision Drill Chuck Holder for CNC Milling and Tapping Operations
SK40-APU16 Drill Chuck Tool Holder is a high-precision chuck designed for secure tool clamping in CNC milling, drilling, and tapping operations. This chuck provides outstanding performance, high rigidity, and stable operation even under high torque and rotational loads. It is an excellent choice for CNC machining centers and milling machines requiring reliable tool clamping during demanding operations.
Usage of SK40-APU16 Drill Chuck in CNC Applications
The SK40-APU16 precision drill chuck is commonly used in CNC milling machines, boring machines, and tapping machines. It is ideal for securely clamping cylindrical shank tools such as drills, taps, and reamers. Thanks to its powerful grip and balanced construction, it ensures minimal runout, making it suitable for both high-speed and high-torque machining tasks.
Key Features:
- Constructed from hardened alloy steel for maximum durability and wear resistance
- High gripping force for safe and stable clamping of drills and taps
- Balanced design suitable for high-speed CNC machining
- Compatible with APU16 industrial chucks with integrated keyless tightening
- Designed according to DIN 69281 (SK40) standard for universal spindle fit
- Ideal for use in metalworking, toolmaking, and automotive manufacturing
Specifications:
| Model | SK40-APU16 |
| Type | Drill Chuck Holder |
| Chuck Type | APU16 (Self-tightening / Keyless) |
| Shank | SK40 |
| Clamping Range | 1–16 mm |
| Material | Alloy Tool Steel |
| Hardness | HRC 56–60 |
| Accuracy | ≤ 0.01 mm |
| Dynamic Balance | G2.5 - 15000 RPM |
| Standard | SK40 DIN 69281 |
Applications in Professional CNC Machining
The SK40-APU16 CNC drill chuck is widely used in industries such as aerospace, automotive production, mold manufacturing, and precision engineering. It is especially effective in operations that require repeated tool changes and stable clamping without using keys or wrenches. The APU16 system ensures consistent performance even under heavy loads and frequent tool swaps.
Important Usage Notes:
- Only use tools with smooth cylindrical shanks — avoid using square or stepped tools
- Ensure the clamping range (1–16 mm) is suitable for your tool diameter
- Clean the chuck and shank before installation to avoid imbalance or slippage
Package Includes:
- 1 x SK40 APU16 Drill Chuck Holder
- 1 x Protective Plastic Case
Enhance your CNC machine's performance with the SK40-APU16 keyless drill chuck holder — designed for secure, accurate, and efficient machining operations in high-demand environments.

