--- title: K-Series Electric Torque Screwdrivers – FAQ & User Guide description: Learn about the Mountz K-Series electric torque screwdrivers, including available models, torque ranges, setup, compatible accessories, maintenance, and applications for medium-torque production fastening. --- - Chat - [Contact Us](https://go.mountztorque.com/contact-us?_gl=1*1t1uhd0*_gcl_au*MjMwOTIyMTI2LjE2ODU1OTU4Mjc.&_ga=2.126080644.843342068.1685595827-2758410.1685595827&hsLang=en-us) - [Sign in](https://www.mountztorque.com/secure/checkout.ssp?is=login&login=T&fragment=login-register&hsLang=en-us) - [![mountztorque](https://mountztorque.com/hubfs/MO18001_Logo_H_Color_Tag_RGB.svg)](https://www.mountztorque.com/?hsLang=en) - North America:[(408) 850-9978](tel:4088509978) - International:[+44 1428 741756](tel:441428741756) - [Shop Products](https://www.mountztorque.com/Product-Type) - [Learning Center](https://www.mountztorque.com/Learning-Center) - [About Us](https://www.mountztorque.com/about-us) - [Service and Calibration](https://go.mountztorque.com/usa-service?_gl=1*1itcg2n*_gcl_au*MjMwOTIyMTI2LjE2ODU1OTU4Mjc.&_ga=2.172874026.843342068.1685595827-2758410.1685595827) [![Mountz\_Assets\_ConversionCalculator\_white](https://mountztorque.com/hubfs/Mountz_Assets_ConversionCalculator_white.svg) Conversion Calculator](https://www.mountztorque.com/torque-conversion-calculator?hsLang=en) [![Mountz\_Assets\_TorqueToolFinder\_white](https://mountztorque.com/hubfs/Mountz_Assets_TorqueToolFinder_white.svg) Torque Tool Finder](https://www.mountztorque.com/torque-conversion-calculator?hsLang=en) [Skip to content](https://mountztorque.com/en-us/knowledge-base/k-series-electric-torque-screwdrivers-faq#main-content) English - United States Show submenu for translations ![vast.png](https://mountztorque.com/hs-fs/hubfs/Mountz%20Logo%20-%20HS.png?width=413&height=135&name=Mountz%20Logo%20-%20HS.png) - [Sample Contact Page](https://5139817.hs-sites.com/sample-contact) - [Sample About Page](https://5139817.hs-sites.com/sample-about) - [Default HubSpot Blog](https://mountztorque-5139817.hs-sites.com/blog) Open main navigation Close main navigation - [Sample Contact Page](https://5139817.hs-sites.com/sample-contact) - [Sample About Page](https://5139817.hs-sites.com/sample-about) - [Default HubSpot Blog](https://mountztorque-5139817.hs-sites.com/blog) - English - United States Show submenu for translations - Contact us Contact us How can we help you? - There are no suggestions because the search field is empty. 1. [Mountz Torque Knowledge Base](https://mountztorque.com/en-us/knowledge-base?hsLang=en-us) 2. [Product Overviews](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us) 3. [Electric Screwdrivers](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us#electric-screwdrivers) # K-Series Electric Torque Screwdrivers – FAQ & User Guide ## The Mountz K-Series Electric Torque Screwdrivers are designed for medium-torque production fastening applications that require accuracy, repeatability, and reliable performance. Featuring a precision automatic shut-off clutch, adjustable torque settings, and ergonomic pistol-style design, the K-Series delivers consistent fastening performance for electronics, automotive, aerospace, and industrial assembly applications. ### 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 1. Connect the K-Series screwdriver to a compatible transformer. 2. Install the appropriate driver bit. 3. Adjust the external torque setting for the fastening application. 4. Verify the torque setting using a calibrated torque analyzer before production. 5. Install the optional Torque Cover if protection against accidental torque adjustment is required. 6. Perform sample fastenings and make final torque adjustments before beginning production. 7. 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. --- ### Integration & Advanced Features - Precision automatic shut-off clutch - External torque adjustment - Lever-start and push-to-start configurations - ESD-safe models available - Ergonomic pistol-style housing - Compatible with optional Torque Cover - Transformer-powered operation - Designed for medium-torque production fastening applications - Rugged production tool design for repetitive assembly environments --- ### Media & Supporting Content                                                                           ![K Series 1200x72](https://mountztorque.com/hs-fs/hubfs/K%20Series%201200x72.jpg?width=670&height=670&name=K%20Series%201200x72.jpg) - [K-Series Product Page](https://www.mountztorque.com/Product-Type/Power-Assembly-Tools/Power-Assembly-Electric-Screwdrivers/Power-Assembly-Clutch-Screwdrivers/Electric-Screwdrivers-K-Series?hsLang=en-us) - [K-Series Product Data Sheet](https://www.mountztorque.com/core/media/media.nl?id=5810270&c=456127&h=7QJuLKMvqyEkdk-wHxiDJpodvNLIRs5CDhWMY8hypxGAJUKu&hsLang=en-us) - [K-Series Operating Manual](https://www.mountztorque.com/core/media/media.nl?id=5743757&c=456127&h=ztReG-KunMmhoToktKUwpAGmX-EcDjDkVvdYdaYUY_00zzFG&hsLang=en-us) - [STC30 Plus Transformer](https://www.mountztorque.com/STC30-Plus-Transformer?quantity=1&hsLang=en-us) --- ### Related Articles / Content - [On-Demand Webinar: How to Select an Electric Screwdriver for Your Manufacturing Process](https://mountztorque.com/en-us/how-to-choose-an-electric-screwdriver-for-precision-assembly-2026?hsLang=en-us) - [Guide: Longevity of Brushless Electric Screwdrivers versus Standard Electric Screwdrivers](https://mountztorque.com/longevity-of-brushless-electric-screwdrivers-versus-standard-electric-screwdrivers?hsLang=en-us) - [Guide: Optimizing Your Assembly Process: Selecting the Right Electric Screwdriver](https://mountztorque.com/optimizing-your-assembly-process-selecting-the-right-electric-screwdriver?hsLang=en-us) - [Case Study: Aerospace Manufacturer Increases Production Efficiency With Brushless Electric Screwdrivers](https://mountztorque.com/aerospace-manufacturer-increases-production-efficiency-with-brushless-electric-screwdrivers?hsLang=en-us) - [Mountz Torque Brushless Electric Screwdrivers Bang Sheet](https://online.flippingbook.com/view/496028839/) - [Mountz Power Tools Service Card](https://online.flippingbook.com/view/326143065/) --- ### Need Help? - [Contact Applications Engineering for setup guidance](https://mountztorque.com/en-us/contact-us?hsLang=en-us) - [Speak with Sales for product selection](https://mountztorque.com/en-us/contact-us?hsLang=en-us) - Call us: - North America:[(408) 850-9978](tel:4088509978) - International: [+44 1428 741756](tel:441428741756) - [Product FAQs](https://mountztorque.com/en-us/knowledge-base/product-faqs?hsLang=en-us#main-content) - [Hand Tools](https://mountztorque.com/en-us/knowledge-base/product-faqs?hsLang=en-us#hand-tools) - [Product Overviews](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us#main-content) - [Torque Screwdrivers](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us#torque-screwdrivers) - [Torque Arms](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us#torque-arms) - [Torque Wrenches](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us#torque-wrenches) - [Torque Analyzers](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us#torque-analyzers) - [Torque Sensors](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us#torque-sensors) - [DC Control Tools](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us#dc-control-tools) - [Electric Screwdrivers](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us#electric-screwdrivers) - [Run Down Adapters](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us#run-down-adapters) - [Calibration Equipment](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us#calibration-equipment) - [Pneumatic Tools](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us#pneumatic-tools) - [Torque Multipliers](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us#torque-multipliers) - [Bits, Sockets and Adapters](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us#bits-sockets-and-adapters) - [Common Questions](https://mountztorque.com/en-us/knowledge-base/common-questions?hsLang=en-us#main-content) - [Torque Analyzers & Sensors](https://mountztorque.com/en-us/knowledge-base/common-questions?hsLang=en-us#torque-analyzers-sensors) - [Torque Wrenches](https://mountztorque.com/en-us/knowledge-base/common-questions?hsLang=en-us#torque-wrenches) - [Sample Contact Page](https://5139817.hs-sites.com/sample-contact) - [Sample About Page](https://5139817.hs-sites.com/sample-about) - [Default HubSpot Blog](https://mountztorque-5139817.hs-sites.com/blog) [![vast.png](https://mountztorque.com/hs-fs/hubfs/Mountz%20Logo%20-%20HS.png?width=413&height=135&name=Mountz%20Logo%20-%20HS.png "vast.png")](https://mountztorque.com?hsLang=en-us) [mailto:email@email.com](mailto:email@email.com) Copyright © 2026, Mountz Inc. ![Stock placeholder image with grayscale geometrical mountain landscape](https://mountztorque.com/hubfs/raw_assets/public/Mountz%20Landing%20Pages/images/footer-logo-white-text.svg "Stock placeholder image with grayscale geometrical mountain landscape") TORQUE PRODUCTS - [Torque Analyzers and Sensors](https://www.mountztorque.com/Product-Type/Torque-Analyzers-and-Sensors) - [Torque Screwdrivers](https://www.mountztorque.com/Product-Type/Torque-Screwdrivers) - [Torque Wrenches](https://www.mountztorque.com/Product-Type/Torque-Wrenches) - [Power Assembly Tools](https://www.mountztorque.com/Product-Type/Power-Assembly-Tools) - [Torque Multipliers](https://www.mountztorque.com/Product-Type/Torque-Multipliers) - [Bits Sockets and Adapters](https://www.mountztorque.com/Product-Type/Bits-Sockets-and-Adapters) - [Production Aids](https://www.mountztorque.com/Product-Type/Production-Aids) - [Accessories](https://www.mountztorque.com/Product-Type/Accessories) - [Error Proofing Aids & Tools](https://www.mountztorque.com/Product-Type/Error-Proofing-Aids-Tools) COMPANY - [About Us](https://www.mountztorque.com/about-us) - [Blog](https://blog.mountztorque.com/) - [Awards](https://www.mountztorque.com/awards) - [Careers](https://www.mountztorque.com/careers) - [Compliances](https://www.mountztorque.com/compliances) - [Core Management](https://mountztorque.com/core-management-team) - [Events](https://www.mountztorque.com/events) - [ISO Certifications](https://www.mountztorque.com/iso-certifications) - [Mountz Intranet](https://mountztorque.com/mountz-sales-intranet) - [Mountz Employee Center](https://mountztorque.com/mountz-employee-center) - [Quality Policy](https://www.mountztorque.com/quality-policy) - [Shop Mountz Apparel](https://stores.inksoft.com/shopmountz/shop/home) - [Torque Webinars](https://www.mountztorque.com/torque-webinars) CONTACT US - [Ask a Question](https://mountztorque.com/contact-us) - [Request an Appointment](https://mountztorque.com/contact-us) - [Request a Catalog](https://mountztorque.com/contact-us) - [Request a Quote](https://mountztorque.com/contact-us) - [Technical Support Request](https://mountztorque.com/contact-us) - [Establish Payment Terms for Your Online Account](https://mountztorque.com/paymentterms) SERVICE, CALIBRATION & REPAIRS - [Torque Conversion Calculator](https://www.mountztorque.com/torque-conversion-calculator) - [Wrench Adapter Calculator](https://www.mountztorque.com/calculations-for-torque-wrench-extension-adapters-and-spanners) - [Service, Calibration and Repairs](https://go.mountztorque.com/usa-service?_gl=1*bwn60t*_gcl_au*MTg5NDQxNTc1LjE3NjY1NTUxNjk.&_ga=2.111592644.1984556770.1766555169-1854918924.1766555169) ![Mountz\_Assets\_Phone\_white](https://mountztorque.com/hubfs/Mountz_Assets_Phone_white.svg) North America: [(408) 850-9978](tel:+14088509978) ![Mountz\_Assets\_Phone\_white](https://mountztorque.com/hubfs/Mountz_Assets_Phone_white.svg)Technical Support: [(669) 200-4219](tel:+6692004219) ![Mountz\_Assets\_clock\_white](https://mountztorque.com/hubfs/Mountz_Assets_clock_white.svg)M-F 6am - 5pm PST   Silicon Valley Headquarters: 1080 N. 11th St San Jose, CA 95112 Alabama Distribution and Service Center: 19051 Underwood Road Foley, AL 36535 Mountz UK: Pier Copse Courtyard Liphook Hants. GU307JN United Kingdom ![Mountz\_Assets\_Phone\_white](https://mountztorque.com/hubfs/Mountz_Assets_Phone_white.svg)International: [+44 1428 741756](tel:+441428741756) [View All Our Locations](https://www.mountztorque.com/locations?hsLang=en) [![Share on facebook](https://7528309.fs1.hubspotusercontent-na1.net/hub/7528309/hubfs/raw_assets/public/mV0_d-web-default-modules_hubspot/img/facebook-color.png?width=24&name=facebook-color.png)](https://www.facebook.com/share.php?u=https%3A%2F%2Fmountztorque.com%2Fsmart-manufacturing-week-2026%3Futm_medium%3Dsocial%26utm_source%3Dfacebook) [![Share on linkedin](https://7528302.fs1.hubspotusercontent-na1.net/hub/7528302/hubfs/raw_assets/public/mV0_d-web-default-modules_hubspot/img/linkedin-color.png?width=24&name=linkedin-color.png)](https://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fmountztorque.com%2Fsmart-manufacturing-week-2026%3Futm_medium%3Dsocial%26utm_source%3Dlinkedin) [![Share on twitter](https://7528304.fs1.hubspotusercontent-na1.net/hub/7528304/hubfs/raw_assets/public/mV0_d-web-default-modules_hubspot/img/twitter-color.png?width=24&name=twitter-color.png)](https://twitter.com/intent/tweet?original_referer=https%3A%2F%2Fmountztorque.com%2Fsmart-manufacturing-week-2026%3Futm_medium%3Dsocial%26utm_source%3Dtwitter&url=https%3A%2F%2Fmountztorque.com%2Fsmart-manufacturing-week-2026%3Futm_medium%3Dsocial%26utm_source%3Dtwitter&source=tweetbutton&text=) [![Share on pinterest](https://7528311.fs1.hubspotusercontent-na1.net/hub/7528311/hubfs/raw_assets/public/mV0_d-web-default-modules_hubspot/img/pinterest-color.png?width=24&name=pinterest-color.png)](https://pinterest.com/pin/create/button/?url=https%3A%2F%2Fmountztorque.com%2Fsmart-manufacturing-week-2026%3Futm_medium%3Dsocial%26utm_source%3Dpinterest&media=) Copyright © 2025 Mountz Torque. All Rights Reserved. - [Terms and Conditions of Sale](https://www.mountztorque.com/terms-and-conditions-of-sale) - [Privacy Policy](https://www.mountztorque.com/privacy-policy) - [Terms of Service](https://www.mountztorque.com/terms-of-service) - Site Map