--- title: TB Break-Over Torque Wrenches – FAQ & User Guide description: Learn about Mountz TB preset break-over torque wrenches, including torque ranges, fixed head configurations, model selection, setup, calibration, maintenance, and applications for controlled 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/tb-break-over-torque-wrenches-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. [Torque Wrenches](https://mountztorque.com/en-us/knowledge-base/product-overviews?hsLang=en-us#torque-wrenches) # TB Break-Over Torque Wrenches – FAQ & User Guide ## The Mountz TB Break-Over Torque Wrenches are compact preset production tools designed for repetitive fastening applications requiring consistent torque and error prevention. Featuring a permanently attached fixed head and break-over mechanism, the TB helps reduce over- and under-tightening while providing a configuration tailored to the application. ### Quick Answer The TB is a compact preset break-over torque wrench designed for repetitive production fastening at a predetermined torque value. When the preset torque is reached, the wrench breaks over, signaling the operator to stop applying force. This helps reduce the risk of over- and under-tightening while supporting repeatable, controlled fastening. Unlike the TBIH, the TB is configured with a **fixed head that is permanently attached to the wrench**. The head type and size are selected when configuring the tool and cannot be interchanged after assembly. --- ### Who This Is For - Manufacturing engineers - Process engineers - Quality engineers - Assembly operators - Production supervisors - Electronics manufacturers - Medical device manufacturers - Aerospace manufacturers - Automotive manufacturers - General industrial assembly facilities --- ### When Should You Use This? **Use the TB when:** - Repetitive fastening is performed at the same torque setting - A dedicated wrench configuration is preferred - Low- to medium-torque fastening is required - Over- and under-tightening need to be controlled - Preventing routine operator torque adjustment is important - A compact wrench is needed for restricted spaces - The application uses a consistent fastener type and size - A permanently attached wrench head is suitable for the process Preset torque wrenches are particularly useful when operators repeatedly assemble parts at the same torque setting. --- ### When Should You NOT Use This? **The TB may not be the best choice when:** - Operators need to frequently change torque settings - Different wrench heads need to be used with the same handle - An adjustable wrench with a visible torque scale is required - Torque requirements exceed the TB range - Electronic torque measurement or fastening data collection is needed - Counterclockwise torque application is required If you need the ability to remove and change wrench heads, consider the **TBIH Break-Over Wrench** instead. The TB has a permanently attached head, while the TBIH uses removable interchangeable heads. --- ### How the TB Works The TB uses a preset break-over mechanism to provide a clear indication when the target torque has been reached. **During operation:** - The wrench is preset to the required torque value. - The operator applies torque to the fastener. - When the preset torque is reached, the wrench breaks over. - The break-over action signals the operator to stop applying force. - The wrench is then ready for the next fastening cycle. **Result:** - Reduced risk of over-tightening - Reduced risk of under-tightening - Repeatable application of preset torque - Improved operator consistency - Better control of repetitive fastening processes The break-over mechanism also helps minimize shock to the assembly. --- ### Core Features - Preset break-over torque wrench - Permanently attached fixed head - Configurable head type and size - Torque range from 25 ozf.in to 50 lbf.in - Break-over mechanism signals when preset torque is reached - Helps reduce over- and under-tightening - Tamper-resistant internal torque adjustment - No external adjustment scale - Small and lightweight design - Designed for restricted spaces - Six colored aluminum handle options for production identification - Designed for repetitive production fastening - Meets ISO 6789:2017 accuracy and repeatability requirements at ±6% of setting The data sheet specifically identifies repeatability, traceability, and precision as benefits of the TB design. --- ### TB Wrench Configuration The TB is a **made-to-order configurable wrench**. Four elements are selected to create the finished wrench and its part number: 1. Wrench handle torque capacity 2. Handle color 3. Wrench head type 4. Wrench head size Once configured, the selected wrench head is permanently attached to the TB handle. --- ### Available Torque Ranges | Configuration | Torque Range | S.I. Range | | --- | --- | --- | | 0600A | 25–50 ozf.in | 17.7–35.3 cN·m | | 0600B | 3–12 lbf.in | 33.9–135.6 cN·m | | 0600C | 12–21 lbf.in | 135.6–237.3 cN·m | | 0600D | 25–50 lbf.in | 226–565 cN·m | **Note:** The current Mountz product page lists the highest configuration as **20–50 lbf.in**, while the 2021 data sheet lists **25–50 lbf.in** for 0600D. I would use **20–50 lbf.in** in the Knowledge Base if you want it aligned with the current product listing. --- ### Model Selection Guide | If you need: | Recommended Configuration | | --- | --- | | Lowest torque fastening | 0600A | | Low-torque fastening | 0600B | | Low- to medium-torque fastening | 0600C | | Highest TB torque capacity | 0600D | | Dedicated production identification | Select the appropriate handle color | | Dedicated fastener configuration | Select the required fixed head type and size | --- ### Handle Color Options The TB is available with six colored aluminum handles that can be used to visually identify different torque settings, applications, assembly stations, or production processes. | Handle Color | Configuration Number | | --- | --- | | Black | 1 | | Blue | 2 | | Red | 3 | | Green | 4 | | Gold | 5 | | Silver | 6 | --- ### TB Fixed Head Options The TB is configured with a permanently attached wrench head selected for the fastening application. **Available head types include:** | Head Type | Configuration | Best For | | --- | --- | --- | | Open End | OE | General fastening and applications requiring side access | | Box End | BE | Increased fastener engagement and control | | Hex Key | HK | Internal hex fasteners | | Flare End | FE | Fasteners around tubing, lines, or obstructions | | Ratchet | RH | Applications requiring repeated tightening without repositioning the wrench | The data sheet provides numerous imperial and metric sizes depending on the selected head style. ### Open End Heads Open end heads are available in imperial and metric configurations, with the data sheet listing sizes from **5/64" through 7/8"** and **3 mm through 22 mm**. ### Box End Heads Box end heads are available in multiple imperial and metric sizes for applications requiring greater fastener engagement. ### Hex Key Heads Hex key configurations support internal hex fasteners and are available in both imperial and metric sizes. ### Flare End Heads Flare end configurations are designed for applications where tubing, lines, or other components limit access around the fastener. ### Ratchet Head The TB can also be configured with a **52-tooth, 1/4" female hex ratchet head**. --- ### TB vs. TBIH The main difference between the TB and TBIH is the wrench head design. | Feature | TB | TBIH | | --- | --- | --- | | Torque Type | Preset | Preset | | Break-Over Mechanism | Yes | Yes | | Head Style | Fixed | Interchangeable | | Head Selected for Application | Yes | Yes | | Head Removable After Assembly | No | Yes | | Best For | Dedicated repetitive fastening | Applications requiring head flexibility | Choose the **TB** when the same head type and size will be used consistently. Choose the **TBIH** when you need the flexibility to remove the wrench head and install another option. --- ### Setup & Torque Adjustment The TB does not have an external torque scale. Its torque value is set using an internal adjustment mechanism and must be verified with a torque analyzer. **For calibration and adjustment:** 1. Select a torque tester or sensor that covers the TB's torque range. 2. Connect the wrench using the appropriate adapter. 3. Apply torque clockwise slowly and smoothly until the wrench breaks over. 4. Note the measured torque value. 5. Adjust the internal torque setting as required. 6. Repeat the test and adjustment until the desired torque value is achieved. 7. Verify the setting before placing the wrench into production. Mountz specifies using **Peak mode** when calibrating break-over torque wrenches with a digital torque tester or sensor. --- ### Calibration & Accuracy The TB should be periodically calibrated and verified as part of the facility's torque control program. Mountz specifies the TB as meeting or exceeding the accuracy and repeatability requirements of **ISO 6789:2017 at ±6% of setting**. The TB is calibrated in the **clockwise direction only**. Mountz's TB FAQ also notes that ISO 6789-1:2017 calls for a maximum of 5,000 cycles before recalibration. --- ### Common Applications **The TB is commonly used in:** - Electronics assembly - Medical device manufacturing - Aerospace assembly - Automotive manufacturing - Instrumentation and precision equipment assembly - General industrial production - Restricted or confined assembly areas - Repetitive production fastening - Dedicated fastening stations - Applications requiring preset torque with a fixed head --- ### Use Cases (Real-World Examples) #### Repetitive Production Fastening **Problem:** Operators repeatedly tighten the same fastener to the same torque value. **Solution:** The TB provides a dedicated preset torque setting and fixed head configuration, helping improve consistency across repetitive fastening cycles. #### Restricted Assembly Areas **Problem:** Limited workspace makes larger torque wrenches difficult to operate. **Solution:** The TB's compact, lightweight design makes it suitable for fastening applications with restricted access. Current product information lists the handle at approximately **5 inches long and 9/16 inch in diameter**. #### Production Error-Proofing **Problem:** Operators can accidentally change adjustable torque settings during production. **Solution:** The TB uses an internal torque adjustment with no external scale, helping prevent routine operator adjustment once the wrench has been configured and verified. #### Dedicated Fastening Station **Problem:** A workstation repeatedly uses the same fastener type, size, and torque value. **Solution:** The TB can be configured with the required fixed head, torque capacity, and handle color to create a dedicated fastening tool for that process. --- ### Maintenance - Keep the wrench clean and free of debris. - Inspect the handle, break-over mechanism, pivot point, and fixed wrench head for wear or damage. - Periodically verify torque output using a calibrated torque analyzer. - Recalibrate according to your facility's calibration schedule and applicable quality requirements. - Verify torque after changing the internal preset value. - Apply torque smoothly at the proper load point when testing or calibrating the wrench. - Remove damaged or improperly functioning tools from service until inspected or repaired. --- ### Integration & Advanced Notes - Mechanical preset torque wrench requiring no electrical power - Fixed head permanently attached to the wrench - Multiple head styles and sizes available when configuring the tool - Internal torque adjustment helps prevent unauthorized setting changes - Six handle colors support visual production identification - Designed for repetitive fastening at a predetermined torque - Clockwise calibration - Compact design for restricted assembly areas - Made-to-order configuration allows torque capacity, handle color, head style, and head size to be selected for the application --- ### Media & Supporting Content                   ![TB Blue 0600B2-OE6\_01.mainview (1)-1](https://mountztorque.com/hs-fs/hubfs/TB%20Blue%200600B2-OE6_01.mainview%20(1)-1.jpg?width=500&height=500&name=TB%20Blue%200600B2-OE6_01.mainview%20(1)-1.jpg) - [TB Break-Over Torque Wrench Product Page](https://www.mountztorque.com/Product-Type/Torque-Wrenches/Torque-Wrenches-Break-Over-Wrenches/Torque-Wrenches-Break-Over-Wrenches-TB?hsLang=en-us) - [TB Break-Over Wrench Data Sheet](https://online.flippingbook.com/view/812949348/) - [TB Break-Over Wrench Manual](https://www.mountztorque.com/core/media/media.nl?id=5743824&c=456127&h=sWYOgmndJLaQv9Vs7ctPIapKDGy17I6SWk8d6KChMy77ZRmL&hsLang=en-us) --- ### Related Content - [Mountz Hand Tools Digital Catalog](https://online.flippingbook.com/view/902216619/) - [Mountz Hand Tools Bang Sheet](https://online.flippingbook.com/view/282685980/) - [How to Select a Wrench Head Infographic](https://online.flippingbook.com/view/64324625/) - [Article: Enhancing Assembly Line Productivity with Top-Quality Preset Torque Wrenches](https://mountztorque.com/enhancing-assembly-line-productivity-with-top-quality-preset-torque-wrenches?hsLang=en-us) - [Article: Unlocking Quality and Control: The Open-End Torque Wrench Advantage](https://mountztorque.com/unlocking-quality-and-control-the-open-end-torque-wrench-advantage?hsLang=en-us) - 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