--- title: HF-Series Brushless Electric Screwdrivers – FAQ & User Guide description: Learn about the Mountz HF-Series brushless electric screwdrivers, including available models, torque ranges, features, setup, compatible accessories, and applications for medium- to high-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/hf-series-brushless-electric-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) # 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 1. Connect the HF-Series screwdriver to the HTC35 Transformer. 2. Install the appropriate bit for the fastening application. 3. Adjust the external torque setting to the desired value. 4. If RPM or Soft Start adjustments are required, connect the Program Lock Key to the HTC35 Transformer and configure the settings. 5. Verify the torque setting using a calibrated torque analyzer before production. 6. Install the optional Torque Cover if protection against accidental torque adjustment is required. 7. 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 - [HF-Series Product Page](https://www.mountztorque.com/Product-Type/Power-Assembly-Tools/Power-Assembly-Electric-Screwdrivers/Power-Assembly-Clutch-Screwdrivers/Electric-Screwdrivers-HF-Series?hsLang=en-us) - 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