CL-Series Electric Torque Screwdrivers – FAQ & User Guide
The Mountz CL-Series Electric Torque Screwdrivers are designed for medium- to high-torque production fastening applications that require accuracy, repeatability, and reliable performance. Featuring a precision automatic shut-off clutch, adjustable torque settings, and multiple start configurations, the CL-Series delivers consistent fastening performance for electronics, aerospace, automotive, and industrial assembly applications.
Quick Answer
The CL-Series is a line of low-voltage DC electric clutch screwdrivers designed for precision production fastening applications requiring accurate, repeatable torque control. Featuring a precision automatic shut-off clutch, adjustable torque settings, lever-start and push-to-start configurations, and optional ESD models, the CL-Series delivers dependable fastening performance across a wide range of torque requirements.
Who This Is For
- Manufacturing engineers
- Process engineers
- Quality engineers
- Assembly operators
- Automotive manufacturers
- Aerospace manufacturers
- Electronics manufacturers
- Industrial assembly facilities
When Should You Use This?
Use the CL-Series when:
- Medium- to high-torque fastening is required
- Repeatable torque control is critical
- High-volume production fastening is performed
- Adjustable torque settings are needed
- Continuous production operation is required
- ESD-safe models are required for static-sensitive environments
- Higher torque capacity is needed than smaller electric screwdrivers can provide
When Should You NOT Use This?
The CL-Series may not be the best choice when:
- Ultra-low torque fastening is required
- Torque and angle traceability are needed
- Programmable fastening strategies are required
- Fastening data collection is required
- A cordless screwdriver is preferred
For programmable fastening strategies and torque-angle monitoring, consider the Mountz ECT-Series or EPT-Series.
How the CL-Series Works
The CL-Series uses a low-voltage DC motor to drive a precision automatic shut-off clutch.
During operation, the screwdriver:
- Delivers repeatable torque output
- Automatically shuts off when the preset torque is reached
- Allows external torque adjustment
- Supports continuous production fastening
- Improves fastening consistency across repetitive assembly operations
Result:
- Accurate torque control
- Consistent fastening quality
- Reduced operator fatigue
- Improved production efficiency
- Reliable assembly performance
Core Features
- Precision automatic shut-off clutch
- External torque adjustment scale
- Low-voltage DC operation
- Lever-start and push-to-start models
- ESD-safe models available
- Wide torque range from 0.17–69 lbf.in
- Compatible with 4 mm HIOS and 1/4" female hex drive bits (model dependent)
- Requires a compatible transformer (power supply)
- CL9000 models include a shockless reaction stand for high-torque applications
Configuration Options
| Configuration | Best For |
|---|---|
| Lever Start | Standard production fastening |
| Push-to-Start | Repetitive assembly applications |
| ESD Models | Static-sensitive electronics manufacturing |
| High-Torque Models | Heavy-duty production fastening |
Available Models
The CL-Series includes multiple electric torque screwdrivers covering torque ranges from 0.17 to 69 lbf.in (2–780 cN·m). Models are available in lever-start, push-to-start, and ESD configurations to support a wide range of production fastening applications.
CL-Series Model Chart| Model | Item Number | Driver Type | Torque Range | RPM (30V / 20V) | Drive Size |
|---|---|---|---|---|---|
| CL2000 | 144103 | Lever Start | 0.17–1.7 lbf.in (2–20 cN·m) | 680 / 490 | 4 mm HIOS |
| CL2000ESD | 144097 | Lever Start (ESD) | 0.17–1.7 lbf.in (2–20 cN·m) | 680 / 490 | 4 mm HIOS |
| CL3000 | 144106 | Lever Start | 0.3–1.7 lbf.in (3–20 cN·m) | 1000 / 670 | 4 mm HIOS |
| CL3000ESD | 144098 | Lever Start (ESD) | 0.3–1.7 lbf.in (3–20 cN·m) | 1000 / 670 | 4 mm HIOS |
| CL4000 | 144110 | Lever Start | 0.9–4.8 lbf.in (10–55 cN·m) | 1000 / 690 | 1/4" Female Hex |
| CL4000PS | 144108 | Push-to-Start | 0.9–4.8 lbf.in (10–55 cN·m) | 1000 / 690 | 1/4" Female Hex |
| CL4000ESD | 144099 | Lever Start (ESD) | 0.9–4.8 lbf.in (10–55 cN·m) | 1000 / 690 | 1/4" Female Hex |
| CL6000 | 144116 | Lever Start | 1.7–8.8 lbf.in (20–100 cN·m) | 800 / 500 | 1/4" Female Hex |
| CL6000PS | 144119 | Push-to-Start | 1.7–8.8 lbf.in (20–100 cN·m) | 800 / 500 | 1/4" Female Hex |
| CL6000ESD | 144320 | Lever Start (ESD) | 1.7–8.8 lbf.in (20–100 cN·m) | 800 / 500 | 1/4" Female Hex |
| CL6500 | 144121 | Lever Start | 2.6–14 lbf.in (30–160 cN·m) | 900 / 600 | 1/4" Female Hex |
| CL6500PS | 144120 | Push-to-Start | 2.6–14 lbf.in (30–160 cN·m) | 900 / 600 | 1/4" Female Hex |
| CL6500ESD | 144100 | Lever Start (ESD) | 2.6–14 lbf.in (30–160 cN·m) | 900 / 600 | 1/4" Female Hex |
| CL7000 | 144126 | Lever Start | 2.6–22 lbf.in (30–250 cN·m) | 750 / 500 | 1/4" Female Hex |
| CL7000PS | 144125 | Push-to-Start | 2.6–22 lbf.in (30–250 cN·m) | 750 / 500 | 1/4" Female Hex |
| CL7000ESD | 144101 | Lever Start (ESD) | 2.6–22 lbf.in (30–250 cN·m) | 750 / 500 | 1/4" Female Hex |
| CL7000 | 144182 | High-Torque Version | 2.6–24 lbf.in (30–271 cN·m) | 550 | 1/4" Female Hex |
| CL9000PS | 144130 | Push-to-Start | 10–43 lbf.in (120–500 cN·m) | 330 | 1/4" Female Hex |
| CL9000PS-HT | 144265 | Push-to-Start | 17–69 lbf.in (192–780 cN·m) | 350 | 1/4" Female Hex |
Model Selection Guide
| If you need: | Recommended Model |
|---|---|
| Ultra-low torque precision assembly | CL2000 or CL3000 |
| Electronics assembly | CL4000 Series |
| Light-duty production fastening | CL6000 Series |
| Medium-torque production | CL6500 Series |
| Higher torque fastening | CL7000 Series |
| Maximum torque capacity | CL9000PS-HT |
| Push-to-start operation | Any PS model |
| ESD-safe production | Any ESD model |
Compatible Accessories
| Accessory | Purpose |
|---|---|
| Compatible Transformer | Required power supply |
| Coiled Cord | Connects screwdriver to transformer |
| Right Angle Adapter | Access confined fastening locations |
| Pistol Grip | Improves ergonomics |
| Push-to-Start Adapter | Converts compatible models |
| Vacuum Adapter Kit | Supports vacuum pickup applications |
Transformer
The CL-Series requires a compatible transformer (power supply) for operation.
Select the transformer based on the screwdriver model and application requirements. Refer to the transformer documentation for compatibility information.
Setup & Adjustment
- Connect the CL-Series screwdriver to a compatible transformer.
- Install the appropriate driver bit for the application.
- Adjust the external torque setting using the torque adjustment scale.
- Verify torque output using a calibrated torque analyzer before production.
- Perform sample fastenings and make final torque adjustments before beginning production.
- For CL9000 models, ensure the shockless reaction stand is properly installed before operation.
- Periodically verify torque output as part of your quality control program.
Common Applications
The CL-Series is commonly used in:
- Electronics assembly
- Automotive manufacturing
- Aerospace assembly
- Industrial equipment manufacturing
- Appliance assembly
- Telecommunications equipment assembly
- General production environments requiring medium- to high-torque fastening
- Applications requiring ESD protection or screw counting
Use Cases (Real-World Examples)
Electronics Assembly
Problem: Precision electronic assemblies require repeatable torque while protecting sensitive components from electrostatic discharge.
Solution: ESD models provide consistent torque control while helping protect static-sensitive assemblies during production.
Automotive & Industrial Assembly
Problem: Medium- to high-torque fasteners must be installed consistently throughout repetitive production cycles.
Solution: The CL-Series delivers accurate torque control with a precision automatic shut-off clutch to improve fastening consistency and product quality.
High-Volume Production
Problem: Production environments require durable fastening tools capable of continuous operation with reliable torque performance.
Solution: The CL-Series is designed for heavy-duty production applications and provides dependable fastening performance across a broad torque range.
High-Torque Applications
Problem: Higher torque fastening can create operator fatigue and torque reaction.
Solution: The CL9000 models include a shockless reaction stand to improve torque control while reducing torque reaction transmitted to the operator.
Maintenance
- Verify torque output regularly using a calibrated torque analyzer.
- Inspect the bit holder and drive components for wear or damage.
- Keep the screwdriver clean and free of dust and debris.
- Inspect the power cord and transformer before operation.
- Replace worn screwdriver bits as needed to maintain fastening accuracy.
- Periodically verify torque settings as part of your preventive maintenance program.
Integration & Advanced Features
- Precision automatic shut-off clutch
- External torque adjustment
- Low-voltage DC operation
- Lever-start and push-to-start configurations
- ESD-safe models available
- Compatible with the Mountz Scout Screw Counter for additional error-proofing
- Compatible with right-angle adapters, pistol grips, vacuum adapters, tool balancers, and ergonomic torque arms
- Transformer-powered operation
- Designed for heavy-duty production fastening applications
Media & Supporting Content
- CL-Series Product Page
- CL-Series Data Sheet
- CL-Series Operating Manual
- CLT-70STC3 Screw Counter Transformer
- CLC-60 Transformer
- STC30 Plus Transformer
Related Articles / Content
- On-Demand Webinar: How to Select an Electric Screwdriver for Your Manufacturing Process
- Guide: Optimizing Your Assembly Process: Selecting the Right Electric Screwdriver
- Mountz Power Tools Digital Catalog
- Mountz Power Tools Service Card
- Mountz Clutch Screwdriver Comparison Chart
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
