HF-Series Brushless Electric Screwdrivers – FAQ & User Guide
The Mountz HF-Series Brushless Electric Screwdrivers are designed for medium- to high-torque production fastening applications that require accuracy, reliability, and long tool life. Featuring Swiss Maxon brushless motors, adjustable speed settings, and continuous-duty performance, the HF-Series delivers consistent torque control for demanding manufacturing environments. Available in lever-start and push-to-start configurations, these screwdrivers are commonly used in electronics, medical device, automotive, and industrial assembly applications.
Quick Answer
The HF-Series is a brushless electric torque screwdriver designed for medium- to high-torque production fastening applications. Powered by a Swiss Maxon brushless motor, the HF-Series delivers accurate torque control, adjustable speed, continuous-duty performance, and ESD-safe operation for demanding manufacturing environments.
Who This Is For
- Manufacturing engineers
- Process engineers
- Quality engineers
- Assembly operators
- Electronics manufacturers
- Medical device manufacturers
- Automotive and industrial manufacturers
- Companies requiring reliable, high-production electric screwdrivers
When Should You Use This?
Use the HF-Series when:
- Continuous production fastening is required
- Medium- to high-torque screwdriving applications are performed
- Fastening accuracy and repeatability are critical
- Operator-adjustable speed is desired
- ESD-safe tools are required
- Long motor life and low maintenance are important
- Production lines require reliable clutch screwdrivers
When Should You NOT Use This?
The HF-Series may not be the best choice when:
- Torque and angle traceability are required
- Fastening data collection is needed
- Advanced process control or error-proofing is required
- A cordless screwdriver is preferred
- Smart fastening strategies are needed
For advanced traceability and programmable fastening strategies, consider the Mountz ECT-Series or EPT-Series transducerized screwdrivers.
How the HF-Series Works
The HF-Series uses a high-performance Swiss Maxon brushless motor to drive a precision mechanical clutch that automatically disengages once the preset torque is reached.
The screwdriver:
- Delivers repeatable torque output
- Automatically disengages at the preset torque
- Allows operators to adjust speed and Soft Start settings
- Protects internal electronics through Over Heat Protection (OHP) and Over Current Protection (OCP)
- Supports continuous-duty production environments
Result:
- Consistent fastening performance
- Improved production efficiency
- Reduced maintenance requirements
- Longer motor life
- Improved product quality
Core Features
- Brushless Swiss Maxon motor
- Adjustable torque output
- Adjustable RPM settings
- Programmable Soft Start (0.2–0.6 seconds)
- External torque adjustment
- Over Heat Protection (OHP)
- Over Current Protection (OCP)
- LED status indicator
- ESD-safe construction
- Compatible with Scout Screw Counter
- Continuous-duty operation
- Requires HTC35 Transformer
Configuration Options
- Lever Start models
- Push-to-Start models
- Adjustable RPM settings
- Programmable Soft Start
- External torque adjustment
- Compatible with Scout Screw Counter
- ESD-safe models
- HTC35 Transformer power supply
Available Models
The HF-Series includes three brushless electric screwdrivers designed for medium- and high-torque production fastening applications. Models are available in lever-start and push-to-start configurations and feature adjustable speed, ESD-safe construction, and external torque adjustment.
HF-Series Model Chart| Model | Item Number | Start Type | Torque Range | RPM | Drive Size | Screw Capacity |
|---|---|---|---|---|---|---|
| HF50N-A ESD | 145925 | Lever Start | 17.4–43.4 lbf.in (196.2–490.5 cN·m) | 600–1050 | 1/4" Female Hex | M4–M6 |
| HF50NP-A ESD | 145926 | Push-to-Start | 17.4–43.4 lbf.in (196.2–490.5 cN·m) | 600–1050 | 1/4" Female Hex | M4–M6 |
| HF100N-A ESD | 145927 | Lever Start | 34.7–87 lbf.in (392.4–981 cN·m) | 150–550 | 1/4" Female Hex | M4–M10 |
Model Selection Guide
| If you need... | Recommended Model |
|---|---|
| Lever-start operation | HF50N-A or HF100N-A |
| Push-to-start operation | HF50NP-A |
| Medium-torque assembly | HF50N-A or HF50NP-A |
| Higher torque fastening | HF100N-A |
| Fast production cycle times | HF50 Series |
| Larger fasteners up to M10 | HF100N-A |
Compatible Accessories
| Accessory | Item Number | Purpose |
|---|---|---|
| HTC35 Transformer | 145824 | Required power supply for all HF-Series screwdrivers |
| Program Lock Key | 145774 | Required to adjust RPM and Soft Start settings |
| Torque Cover | 145903 | Helps prevent accidental or unauthorized torque adjustment |
| Scout Screw Counter | Compatible | Supports screw counting applications |
HTC35 Transformer
The HF-Series requires the HTC35 Transformer for operation.
| Model | Item Number | Input | Output |
|---|---|---|---|
| HTC35 Transformer | 145824 | 110/230 VAC | 35 VDC, 4A |
Setup & Adjustment
- Connect the HF-Series screwdriver to the HTC35 Transformer.
- Install the appropriate bit for the fastening application.
- Adjust the external torque setting to the desired value.
- If RPM or Soft Start adjustments are required, connect the Program Lock Key to the HTC35 Transformer and configure the settings.
- Verify the torque setting using a calibrated torque analyzer before production.
- Install the optional Torque Cover if protection against accidental torque adjustment is required.
- Perform sample fastenings and make final adjustments before beginning production.
Common Applications
The HF-Series is commonly used in:
- Electronics assembly
- Medical device manufacturing
- Aerospace assembly
- Automotive subassembly
- Industrial equipment manufacturing
- Telecommunications equipment assembly
- General production environments requiring repeatable torque control
Use Cases (Real-World Examples)
Electronics Assembly
Problem: Continuous production fastening requires accurate torque while minimizing maintenance.
Solution: The HF-Series combines a Swiss Maxon brushless motor with a precision clutch to deliver repeatable torque and long service life.
Medical Device Manufacturing
Problem: Precision assemblies require consistent fastening without excessive operator fatigue.
Solution: The lightweight design and adjustable speed settings help improve fastening accuracy and operator comfort during repetitive assembly.
High-Volume Production
Problem: Electric screwdrivers must operate continuously without overheating or excessive maintenance.
Solution: The brushless motor, Over Heat Protection (OHP), and Over Current Protection (OCP) are designed to support continuous-duty production environments.
Quality-Controlled Assembly
Problem: Operators may accidentally change torque settings during production.
Solution: The optional Torque Cover helps protect torque settings from accidental adjustment, improving fastening consistency.
Maintenance
- Verify torque output regularly using a calibrated torque analyzer.
- Inspect the bit holder and drive components for wear or damage.
- Keep ventilation openings clean and free of debris.
- Inspect the power cable and HTC35 Transformer before operation.
- Verify RPM and Soft Start settings after any configuration changes.
- Replace worn screwdriver bits as needed to maintain fastening performance.
Integration & Advanced Features
- Swiss Maxon brushless motor
- Adjustable RPM settings
- Programmable Soft Start (0.2–0.6 seconds)
- External torque adjustment
- Over Heat Protection (OHP)
- Over Current Protection (OCP)
- LED status indicator
- Compatible with the Scout Screw Counter
- ESD-safe construction
- Requires HTC35 Transformer for operation
Media & Supporting Content
Related Content / Content
Coming Soon*
Need Help?
- Contact Applications Engineering for setup guidance
- Speak with Sales for product selection
- Call us:
- North America:(408) 850-9978
- International: +44 1428 741756
M-F 6am - 5pm PST
