K-Series Electric Torque Screwdrivers

Quick Answer

The K-Series is a line of electric clutch screwdrivers designed for medium-torque production fastening applications requiring accurate, repeatable torque control. Featuring a precision automatic shut-off clutch, adjustable torque settings, and lever-start or push-to-start configurations, the K-Series provides reliable fastening performance for continuous production environments.

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 K-Series when:

Medium-torque fastening is required
Repeatable torque control is critical
High-volume production is performed
Operator comfort is important
Adjustable torque settings are needed
Continuous production fastening is required
Larger fasteners require higher torque capacity than the EF-Series

When Should You NOT Use This?

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

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

For programmable fastening strategies and torque-angle monitoring, consider the Mountz ECT-Series or EPT-Series.

How the K-Series Works

The K-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
Helps improve fastening consistency

Result:

Accurate torque control
Improved product quality
Reduced fastening variation
Increased production efficiency
Reliable assembly performance

Core Features

Precision automatic shut-off clutch
External torque adjustment scale
Lever-start and push-to-start configurations
ESD-safe models available
Ergonomic pistol-style housing
Rugged production tool design
Repeatable torque control
Compatible with optional Torque Cover
Requires a compatible transformer (power supply)

Configuration Options

Lever-start models
Push-to-start models
ESD-safe models
External torque adjustment
Optional Torque Cover
Transformer-powered operation

Available Models

The K-Series includes four electric torque screwdrivers designed for medium-torque production fastening applications. Models are available in lever-start and push-to-start configurations with torque capacities ranging from 2.6 to 39 lbf.in (29.4–441 cN·m).

K-Series Model Chart

Model	Item Number	Start Type	Torque Range	RPM (High/Low)	Drive Size
K250-A ESD	145665	Lever Start	2.6–21.7 lbf.in (29.4–245 cN·m)	1050 / 630	1/4" Female Hex
K250P-A ESD	145673	Push-to-Start	2.6–21.7 lbf.in (29.4–245 cN·m)	1050 / 630	1/4" Female Hex
K350-A ESD	145666	Lever Start	3.5–30.4 lbf.in (39.3–343 cN·m)	750 / 460	1/4" Female Hex
K350P-A ESD	145674	Push-to-Start	3.5–30.4 lbf.in (39.3–343 cN·m)	750 / 460	1/4" Female Hex
K450-A ESD	145667	Lever Start	4.3–39 lbf.in (49.1–441 cN·m)	550 / 330	1/4" Female Hex
K450P-A ESD	145675	Push-to-Start	4.3–39 lbf.in (49.1–441 cN·m)	550 / 330	1/4" Female Hex

Model Selection Guide

If you need:	Recommended Model
Lower medium-torque applications	K250 Series
General production assembly	K350 Series
Highest torque capacity	K450 Series
Lever-start operation	K250-A, K350-A, K450-A
Push-to-start operation	K250P-A, K350P-A, K450P-A

Compatible Accessories

Accessory	Item Number	Purpose
Torque Cover	145615	Prevents accidental torque adjustment
Transformer	Required	Powers the screwdriver

Transformer

The K-Series requires a compatible transformer (power supply) for operation.

Refer to the product documentation to select the appropriate transformer for your screwdriver model.

Setup & Adjustment

Connect the K-Series screwdriver to a compatible transformer.
Install the appropriate driver bit.
Adjust the external torque setting for the fastening 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.
Perform sample fastenings and make final torque adjustments before beginning production.
Periodically verify torque output as part of your quality control program.

Common Applications

The K-Series is commonly used in:

Automotive assembly
Aerospace manufacturing
Industrial equipment assembly
Heavy electronics assembly
Appliance manufacturing
General production environments requiring medium-torque fastening
Applications requiring higher torque than the EF-Series

Use Cases (Real-World Examples)

Automotive Assembly

Problem: Production fastening applications require higher torque capacity while maintaining repeatable fastening performance.

Solution: The K-Series provides accurate torque control with a precision automatic shut-off clutch, helping improve fastening consistency and assembly quality.

Industrial Manufacturing

Problem: Medium-torque fasteners must be installed consistently throughout repetitive production cycles.

Solution: The K-Series delivers reliable fastening performance with adjustable torque settings and ergonomic operation for continuous production environments.

High-Volume Production

Problem: Operators require a dependable electric screwdriver capable of handling larger fasteners without sacrificing repeatability.

Solution: The K-Series combines higher torque capacity with automatic shut-off clutch technology to provide consistent fastening performance throughout the production shift.

Electronics & Equipment Assembly

Problem: Larger electronic enclosures and industrial equipment require more fastening torque than standard precision screwdrivers can provide.

Solution: The K-Series bridges the gap between precision assembly tools and higher-torque production fastening applications.

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