--- title: Flex Power In-Line Pulse Tools – FAQ & User Guide description: Learn about the Mountz Flex Power In-Line Pulse Tools, including available auto shut-off and non-shut-off models, torque ranges, setup, maintenance, and applications for high-speed, low-reaction pneumatic fastening in production environments. --- - 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/flex-power-in-line-pulse-tools-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. [Pneumatic Tools](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us#pneumatic-tools) # Flex Power In-Line Pulse Tools – FAQ & User Guide ## The Mountz Flex Power In-Line Pulse Tools are designed for high-speed production fastening applications requiring low vibration, minimal torque reaction, and repeatable torque output. Available in automatic shut-off and non shut-off models, the Flex Power Series delivers excellent power-to-weight ratios and ergonomic performance for demanding manufacturing environments. ### Quick Answer The Flex Power In-Line Pulse Tools are pneumatic pulse tools designed for medium- to high-torque production fastening applications. Featuring pulse technology, low reaction force, an excellent power-to-weight ratio, and both automatic shut-off and non shut-off models, the Flex Power Series improves operator comfort while delivering fast, repeatable fastening performance. --- ### Who This Is For - Manufacturing engineers - Process engineers - Quality engineers - Assembly operators - Automotive manufacturers - Heavy equipment manufacturers - Aerospace manufacturers - General industrial assembly facilities --- ### When Should You Use This? Use Flex Power In-Line Pulse Tools when: - Medium- to high-torque fastening is required - High-speed production is important - Reducing operator fatigue is a priority - Low torque reaction is desired - Impact wrench vibration should be minimized - Pneumatic fastening is preferred --- ### When Should You NOT Use This? Flex Power In-Line Pulse Tools may not be the best choice when: - Programmable fastening is required - Torque-angle monitoring or traceability is needed - Very low torque precision fastening is required - Cordless operation is preferred - Electric fastening systems are required For programmable fastening, consider the Mountz ECT-Series, HD-Series, or YF-Series. --- ### How Flex Power Pulse Tools Work Flex Power Pulse Tools use compressed air to drive a hydraulic pulse mechanism that delivers torque in short, controlled pulses. **During operation, the tool:** - Uses compressed air to power the motor. - Transfers energy through specially formulated pulse fluid. - Delivers torque through hydraulic pulses rather than continuous impact. - Automatically shuts off (Auto Shut-Off models) or continues running (Non Shut-Off models) depending on the selected configuration. - Minimizes vibration and reaction force compared to traditional impact wrenches. **Result:** - Fast rundown speeds - Repeatable torque output - Reduced operator fatigue - Lower vibration - Improved ergonomics --- ### Core Features - Hydraulic pulse fastening technology - Available in Auto Shut-Off and Non Shut-Off models - High-speed rundown - Excellent power-to-weight ratio - Low noise operation - Minimal vibration - Reaction-free operation - Comfortable rubberized non-slip grip - Special pulse fluid extends service intervals - Double sealing reduces maintenance requirements - Wide range of torque capacities - Available with 1/4" female hex and 3/8" square drive outputs --- ### Configuration Options | Configuration | Best For | | --- | --- | | Auto Shut-Off | Repeatable production fastening | | Non Shut-Off | Operator-controlled fastening | | 1/4" Female Hex | Screwdriving applications | | 3/8" Square Drive | Nutrunner and socket applications | --- ### Available Models The Flex Power In-Line Series includes both **Auto Shut-Off** and **Non Shut-Off** pulse tools covering torque ranges from **4.4 to 34.6 lbf.ft (6–47 N·m)**. Models are available with either **1/4" female hex** or **3/8" square drive** outputs. Flex Power In-Line Model Chart | Auto Shut-Off Model | Non Shut-Off Model | Item Numbers | Drive Type | Torque Range | Free Speed | | --- | --- | --- | --- | --- | --- | | FLEXS-30SX | FLEX-30SX | 360122 / 360130 | 1/4" Female Hex | 4.4–9.2 lbf.ft (6–12.5 N·m) | 4200 RPM | | FLEXS-40SX | FLEX-40SX | 360123 / 360131 | 1/4" Female Hex | 7.4–13.2 lbf.ft (10–18 N·m) | 4200 RPM | | FLEXS-40S | FLEX-40S | 360124 / 360132 | 3/8" Square Drive | 8.1–14 lbf.ft (11–19 N·m) | 4200 RPM | | FLEXS-50SX | FLEX-50SX | 360125 / 360133 | 1/4" Female Hex | 10.3–19.1 lbf.ft (14–26 N·m) | 7200 RPM | | FLEXS-50S | FLEX-50S | 360126 / 360134 | 3/8" Square Drive | 11.1–19.9 lbf.ft (15–27 N·m) | 7200 RPM | | FLEXS-60SX | FLEX-60SX | 360127 / 360135 | 1/4" Female Hex | 14.8–22.1 lbf.ft (20–30 N·m) | 6000 RPM | | FLEXS-60S | FLEX-60S | 360128 / 360136 | 3/8" Square Drive | 16.2–25.8 lbf.ft (22–35 N·m) | 6000 RPM | | FLEXS-70S | FLEX-70S | 360129 / 360137 | 3/8" Square Drive | 22.8–34.6 lbf.ft (31–47 N·m) | 5000 RPM | *Specifications are based on the Flex Power In-Line Pulse Tool Product Bulletin.* --- ### Model Selection Guide | If you need: | Recommended Model | | --- | --- | | Lowest torque applications | FLEX-30SX / FLEXS-30SX | | General production fastening | FLEX-40 Series | | Medium-torque applications | FLEX-50 Series | | Higher torque fastening | FLEX-60 Series | | Maximum torque capacity | FLEX-70S / FLEXS-70S | | Automatic torque shut-off | FLEXS models | | Operator-controlled fastening | FLEX models | | Socket applications | 3/8" Square Drive models | | Screwdriving applications | 1/4" Female Hex models | --- Compatible Accessories | Accessory | Purpose | | --- | --- | | Air Filter, Regulator & Lubricator (FRL) | Provides clean, regulated compressed air | | 1/4" Hex Bits | Screwdriving applications | | 3/8" Drive Sockets | Nutrunner applications | | Torque Analyzer | Verifies tool torque output | | Digital Torque Wrench | Joint validation and verification | --- ### Setup & Adjustment 1. Connect the tool to a clean, dry, regulated compressed air supply. 2. Maintain a recommended operating pressure of **85 PSI**. 3. Install the appropriate driver bit or socket. 4. Adjust the tool to the required torque setting. 5. Verify torque output using a calibrated torque analyzer before production. 6. Validate torque on the actual application joint, as extensions, adapters, joint conditions, and air pressure can affect final torque. 7. Periodically verify torque as part of your quality control program. ### Common Applications The Flex Power In-Line Pulse Tools are commonly used in: - Automotive assembly - Heavy equipment manufacturing - Aerospace assembly - Truck and commercial vehicle assembly - Industrial equipment manufacturing - General industrial production - High-volume fastening applications - Medium- to high-torque assembly operations --- ### Use Cases (Real-World Examples) #### Automotive Assembly **Problem:** Operators require high-speed fastening while minimizing fatigue from torque reaction and vibration. **Solution:** Flex Power Pulse Tools use hydraulic pulse technology to deliver fast rundown speeds with minimal reaction force and vibration, improving operator comfort during repetitive assembly. --- #### High-Volume Production **Problem:** Continuous production environments demand fastening tools that deliver consistent torque while reducing maintenance. **Solution:** The specially formulated pulse fluid and double-sealing system extend service intervals and improve long-term reliability in continuous-duty applications. --- #### Heavy-Duty Fastening **Problem:** Production applications require higher torque than conventional screwdrivers while maintaining operator comfort. **Solution:** Flex Power models provide torque capacities up to **34.6 lbf.ft (47 N·m)** with an excellent power-to-weight ratio and reduced torque reaction. --- #### Socket and Screwdriving Applications **Problem:** Different fastening applications require different drive styles. **Solution:** The Flex Power Series is available with both **1/4" female hex** and **3/8" square drive** outputs, allowing the same product family to support screwdriving and socket fastening applications. --- ### Maintenance - Verify torque output regularly using a calibrated torque analyzer. - Inspect the drive spindle, anvil, and bit or socket for wear or damage. - Use clean, dry, regulated compressed air maintained at the recommended **85 PSI**. - Install a high-quality air filter, regulator, and lubricator (FRL) to help remove moisture and debris from the air supply. - Inspect air hoses and fittings for leaks or damage. - Periodically check pulse tool performance and service the pulse mechanism according to the recommended maintenance schedule. - Validate torque on the actual joint whenever tooling, extensions, sockets, or air pressure conditions change. --- ### Integration & Advanced Features - Hydraulic pulse fastening technology - Available in Auto Shut-Off and Non Shut-Off models - High-speed rundown - Excellent power-to-weight ratio - Low noise operation - Minimal vibration - Reaction-free operation - Comfortable rubberized non-slip grip - Special pulse fluid designed to extend service intervals - Double-sealing system to improve durability and reduce maintenance - Available with 1/4" female hex and 3/8" square drive outputs - Designed for continuous-duty industrial production applications --- ### Media & Supporting Content                                       ![flexs40sx-360123\_01.mainview](https://mountztorque.com/hs-fs/hubfs/flexs40sx-360123_01.mainview.jpg?width=600&height=600&name=flexs40sx-360123_01.mainview.jpg) - [Flex Power In-Line Pulse Tools Product Page](https://www.mountztorque.com/Product-Type/Power-Assembly-Tools/Power-Assembly-Pneumatic-Tools/Power-Assembly-Pulse-Tools/Power-Assembly-Pulse-Tools-Flex-Power-Inline?hsLang=en-us) - [Flex Power In-Line Pulse Tool Data Sheet](https://www.mountztorque.com/core/media/media.nl?id=5794875&c=456127&h=WevwkaUwo2B9wpLY963HiFmv0yvO_vfJydLqk9PZiPXqoNFP&hsLang=en-us) - [Flex Power Operating Manual](https://www.mountztorque.com/core/media/media.nl?id=5743763&c=456127&h=TAL0rJWsXQ46cjyy8ohRjIU2sAYBTZuw9kWvXYnpdxp6GpXK&hsLang=en-us) - [Flex Power In-Line Quick Start Guide](https://www.mountztorque.com/core/media/media.nl?id=5743775&c=456127&h=8k20sKH6tCom4TMS9ZwZ9nvUerVITVXKZB9yixjxuzaghRLz&hsLang=en-us) --- ### Related Content - [Optimizing Fastening Solutions: The Advantages of Pulse Tools Over Impact Wrenches](https://mountztorque.com/mountz-torque-article-optimizing-fastening-solutions-the-advantages-of-pulse-tools-over-impact-wrenches?hsLang=en-us) - [Guide: Pulse Tool Selection Best Practices: Prioritizing Ergonomics, Productivity, and Cost Efficiency](https://mountztorque.com/en-us/pulse-tool-selection-best-practices-prioritizing-ergonomics-productivity-and-cost-efficiency?hsLang=en-us) - [Understanding Joint Relaxation and Mitigation Strategies](https://mountztorque.com/understanding-joint-relaxation-and-mitigation-strategies?hsLang=en-us) - [Mountz Power Tools Sales Bang Sheet](https://online.flippingbook.com/view/282676755/) - [Mountz Brushless Tools Sales Bang Sheet](https://online.flippingbook.com/view/496028839/) - [Mountz Torque Power Assembly Tools Catalog](https://online.flippingbook.com/view/301147279/) - [On-Demand Webinar: How to Test a Power Tool Calibration & Reliability](https://mountztorque.com/en-us/how-to-test-a-power-tool-calibration-reliability-2025?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) - [Article: Choosing the Right Power Tool for Your Joint Application](https://mountztorque.com/choosing-the-right-power-tool-for-your-joint-application?hsLang=en-us) --- ### 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) - [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