Machine requirements
For machines that use ER20 tooling and water cooling. Check that your drive supports 21,000 rpm rated and that the mounting dimensions fit: Ø105 mm · 312 mm overall.
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GDK SPINDLE · MANUAL
GDK105-21Z/3.5
A 105 mm water-cooled ER20 spindle with 3.5 kW rated output at 21,000 rpm. Use its 350 Hz specification when comparing drive requirements.
3.5 kW ratedER20Water-cooled21,000 rpm rated
MODEL SELECTION
Is this spindle right for your machine?
Check before ordering
Check the 312 mm overall length and the mounting drawing. A nearby 24,000 rpm model is not an electrical match just because it uses ER20.
Compare alternatives
The GDK105 variable-range configuration has different output, current and installation dimensions.
Compare the differences →SPECIFICATIONS
Read the operating conditions.
This water-cooled spindle uses ER20 tooling. Power: 3.5 kW rated. Speed: 21,000 rpm rated. Installation dimensions and weight: 105 mm body diameter, 312 mm overall length, 12 kg weight. Winding options: 220 V / 12.1 A or 380 V / 7 A.
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| Output and duty | |
|---|---|
| Rated power (kW) | 3.5 |
| Rated speed (rpm) | 21,000 |
| Tooling and mounting | |
| Tool interface | ER20 |
| Tool change | Manual tool change |
| Electrical | |
| Frequency (Hz) | 350 |
| Dimensions and weight | |
| Body diameter (mm) | 105 |
| Overall length (mm) | 312 |
| Weight (kg) | 12 |
| Cooling and feedback | |
| Cooling | Water-cooled |
Winding options
Match the voltage and current of the winding you intend to order.
- 220 V · 12.1 A
- 380 V · 7 A
INSTALLATION CHECKS
Match the whole assembly.
Start with the exact GDK105-21Z/3.5 configuration. Compare the mounting drawing, nose clearance and connection locations with the existing installation. Check the collet, nut clearance and usable clamp area before reusing tooling or supports.
- Check the water circuit and the connector details shown in the drawing.
- Match the drive to the selected winding’s voltage and current.
COMPARE RELATED SPINDLES
Compare the installation differences.
These models illustrate different interfaces and installation requirements. Check each drawing before choosing.
Scroll across to compare columns. Keyboard: focus the table area and use the left/right arrow keys.
| Model | Power / duty | Speed | Interface | Cooling | Key difference |
|---|---|---|---|---|---|
| GDK105-21Z/3.5Current configuration | 3.5 kW rated | 21,000 rpm rated | ER20 | Water-cooled | Ø105 mm · 312 mm overall |
| GDK105-9-21Z/2.2-5.0 | 2.2 kW rated | 9,000–21,000 rpm | ER20 | Water-cooled | Ø105 mm · 344 mm overall · 155 mm clamp |
| GDK100-12-24Z/2.2-4.4 | 2.2 kW rated | 12,000–24,000 rpm | ER20 | Water-cooled | Ø100 mm · 295 mm overall · 140 mm clamp |
| GDK100-24Z/3.2 | 3.2 kW rated | 24,000 rpm rated | ER20 | Water-cooled | Ø100 mm · 295 mm overall · 140 mm clamp |
| GDK80-12-24Z/1.2-2.4 | 1.2 kW rated | 12,000–24,000 rpm | ER20 | Water-cooled | Ø80 mm · 284 mm overall · 135 mm clamp |
DOWNLOADS
Files for this configuration.
No standalone PDF is listed for this configuration. Use the full-size drawing above and include any document requirements in your inquiry.
For CAD or additional installation drawings, include the exact model and configuration in your inquiry.
MODEL QUESTIONS
Before you order.
What tooling and mounting does GDK105-21Z/3.5 need?
This configuration combines ER20 tooling, 21,000 rpm rated and Ø105 mm · 312 mm overall. Keep the complete code when comparing drawings.
What should I include in a replacement inquiry?
Include the existing nameplate, mounting dimensions, required ER20 tooling, drive details and cooling arrangement. The GDK105 variable-range configuration has different output, current and installation dimensions.
REQUEST A QUOTE
Tell us what your machine needs.
Share a model or describe what you need to match. Unknown technical details can be left blank.
Useful details to have ready
- Exact code and readable nameplate
- Mounting dimensions and available clearance
- Tool interface and required speed
- Drive output, cooling and ATC connections
Attach photographs or drawings in your email application.