LF-Series Brushless Electric Screwdrivers

The Mountz LF-Series Brushless Electric Screwdrivers are designed for low-torque precision fastening applications that require accuracy, reliability, and long tool life. Featuring Swiss Maxon brushless motors, adjustable torque, and ESD-safe construction, the LF-Series delivers consistent fastening performance while reducing maintenance requirements. Available in lever-start and push-to-start configurations, the LF-Series is commonly used in electronics, medical device, aerospace, and industrial assembly applications.

Quick Answer

The LF-Series is a line of brushless electric clutch screwdrivers designed for precision assembly applications requiring accurate, repeatable torque control. Powered by Swiss Maxon brushless motors, the LF-Series provides continuous-duty performance, adjustable torque settings, ESD-safe operation, and long motor life for low-torque production fastening applications.

Who This Is For

Manufacturing engineers
Process engineers
Quality engineers
Assembly operators
Electronics manufacturers
Medical device manufacturers
Aerospace manufacturers
Industrial assembly facilities

When Should You Use This?

Use the LF-Series when:

Low-torque precision fastening is required
Repeatable torque control is critical
High-volume production is performed
ESD-safe tools are required
Long motor life and reduced maintenance are important
Continuous-duty operation is needed
Electronics or medical assemblies require precise fastening

When Should You NOT Use This?

The LF-Series may not be the best choice when:

Medium- or high-torque applications are required
Torque and angle traceability is needed
Fastening data collection is required
Advanced process control or error-proofing is necessary
A cordless screwdriver is preferred

For smart fastening applications with torque and angle monitoring, consider the Mountz ECT-Series or EPT-Series.

How the LF-Series Works

The LF-Series uses a high-performance Swiss Maxon brushless motor to drive a precision automatic shut-off clutch.

During operation, the screwdriver:

Delivers consistent torque output
Automatically disengages when the preset torque is reached
Reduces motor wear through brushless technology
Allows external torque adjustment
Supports continuous-duty production fastening

Result:

Accurate torque control
Improved fastening consistency
Reduced maintenance
Longer motor life
Increased production efficiency

Core Features

Swiss Maxon brushless motor
Precision automatic shut-off clutch
External torque adjustment
Lever-start and push-to-start models
ESD-safe construction
Continuous-duty operation
Compatible with Scout Screw Counter
Long motor life
Reduced maintenance requirements
Requires STC40 or FT-30D transformer

Configuration Options

Lever-start models
Push-to-start models
External torque adjustment
Compatible with Scout Screw Counter
ESD-safe models
STC40 Transformer
FT-30D Mini Transformer

Available Models

The LF-Series includes eight brushless electric screwdrivers designed for precision, low-torque fastening applications. Models are available in both lever-start and push-to-start configurations and share the same ergonomic grip and 1/4" female hex drive.

LF-Series Model Chart

Model	Item Number	Start Type	Torque Range	RPM	Drive Size	Screw Capacity
LF060-A ESD	145897	Lever Start	0.8–5.2 lbf.in	1550	1/4" Female Hex	Small precision fasteners
LF060P-A ESD	145898	Push-to-Start	0.8–5.2 lbf.in	1550	1/4" Female Hex	Small precision fasteners
LF080-A ESD	145891	Lever Start	1.7–6.9 lbf.in	1250	1/4" Female Hex	Precision assembly
LF080P-A ESD	145892	Push-to-Start	1.7–6.9 lbf.in	1250	1/4" Female Hex	Precision assembly
LF120-A ESD	145893	Lever Start	2.6–10.4 lbf.in	1000	1/4" Female Hex	General electronics assembly
LF120P-A ESD	145894	Push-to-Start	2.6–10.4 lbf.in	1000	1/4" Female Hex	General electronics assembly
LF180-A ESD	145895	Lever Start	3.5–15.6 lbf.in	700	1/4" Female Hex	Higher-torque precision assembly
LF180P-A ESD	145896	Push-to-Start	3.5–15.6 lbf.in	700	1/4" Female Hex	Higher-torque precision assembly

Model Selection Guide

If you need...	Recommended Model
Lowest torque applications	LF060 Series
Precision electronics assembly	LF080 Series
General production assembly	LF120 Series
Highest torque capacity	LF180 Series
Lever-start operation	LF060-A, LF080-A, LF120-A, LF180-A
Push-to-start operation	LF060P-A, LF080P-A, LF120P-A, LF180P-A

Compatible Accessories

Accessory	Item Number	Purpose
STC40 Transformer	145754	Standard power supply
FT-30D Mini Transformer	145870	Compact power supply
Torque Cover	145823	Prevents accidental torque adjustment
Scout Screw Counter	Compatible	Screw counting applications

Compatible Transformers

The LF-Series requires either an STC40 Transformer or FT-30D Mini Transformer for operation.

Model	Item Number	Purpose
STC40 Transformer	145754	Standard power supply
FT-30D Mini Transformer	145870	Compact power supply

Setup & Adjustment

Connect the LF-Series screwdriver to either the STC40 Transformer or FT-30D Mini Transformer.
Install the appropriate driver bit.
Adjust the external torque setting for the application.
Verify the torque setting using a calibrated torque analyzer before production.
Install the optional Torque Cover if protection against accidental torque adjustment is required.
Connect the Scout Screw Counter if screw counting is part of the assembly process.
Perform sample fastenings and make final torque adjustments before beginning production.

Common Applications

The LF-Series is commonly used in:

Electronics assembly
Medical device manufacturing
Aerospace assembly
Telecommunications equipment assembly
Industrial product assembly
Precision manufacturing
General production environments requiring low-torque fastening

Use Cases (Real-World Examples)

Electronics Assembly

Problem: Precision electronic assemblies require accurate, repeatable low-torque fastening to prevent damage to sensitive components.

Solution: The LF-Series provides precise automatic shut-off clutch operation and repeatable torque control for delicate assembly applications.

Medical Device Manufacturing

Problem: Medical products require consistent fastening while minimizing maintenance and downtime.

Solution: The Swiss Maxon brushless motor delivers long service life and reliable fastening performance in continuous production environments.

High-Volume Production

Problem: Production tools must operate continuously with minimal maintenance while maintaining fastening accuracy.

Solution: The brushless motor design eliminates brush wear, reducing maintenance requirements while supporting continuous-duty operation.

ESD-Sensitive Manufacturing

Problem: Electrostatic discharge can damage sensitive electronic components during assembly.

Solution: All LF-Series models feature ESD-safe construction to help protect sensitive products and improve manufacturing quality.

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 debris.
Inspect the power cable and transformer before operation.
Periodically verify torque settings as part of your preventive maintenance program.
Replace worn screwdriver bits to maintain fastening accuracy.