TBX-Series Break-Over Torque Wrenches – FAQ & User Guide

Quick Answer

TBX-Series torque wrenches provide repeatable preset torque using a break-over mechanism that helps prevent over-torque, improve operator consistency, and support quality-controlled fastening applications.

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Who This Is For

• Manufacturing & process engineers
• Assembly operators
• Quality engineers
• Electronics, aerospace, automotive, and medical device manufacturers
• Industrial production and regulated manufacturing environments
• CX and Sales teams supporting fastening applications

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When Should You Use This?

Use TBX-Series torque wrenches when:

• Repeatable preset torque is required
• Operator consistency is critical
• Over-torque prevention is important
• Multiple operators use the same fastening tool
• Production assembly requires controlled fastening processes
• Quality-system compliance and traceability are priorities

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When Should You NOT Use This?

Do not use TBX-Series tools if:

• Torque needs to be adjusted frequently on the production floor
• Bidirectional torque operation is required
• General maintenance or low-volume service work is the primary application
• A lower-cost consumer-grade torque wrench is sufficient

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How TBX-Series Torque Wrenches Work

TBX tools use a break-over mechanism instead of a traditional click design.

When preset torque is reached:

• The wrench pivots or “breaks” at the hinge point
• The operator receives a strong visual and tactile indication
• Additional torque application is naturally interrupted

Result:

Improved torque consistency, reduced operator variability, and lower risk of over-torque or fastener damage.

Unlike click wrenches, the break-over action provides more reaction time and physically discourages continued force application.

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Core Features

• Preset torque configuration
• Break-over torque indication
• Strong tactile and visual feedback
• Helps reduce over-torque and under-torque conditions
• Interchangeable head system
• Designed for production-controlled environments
• Long calibration life
• ISO 6789 compliant
• ±4% torque accuracy

 

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TBX-Series Models

The TBX Series is available in multiple torque ranges to support controlled production fastening applications where repeatable torque and operator consistency are critical.

Each TBX model is preset to a specific torque value within its available torque range and should be verified using a torque analyzer during setup and calibration.

How TBX Models Are Specified

Each TBX model represents a torque wrench family capable of being preset to a range of torque values.

The published range indicates the available torque settings that can be specified during setup or calibration.

Example:

The TBX-25 has an available torque range of 5–25 N·m.

If your application requires 15 N·m, the wrench can be preset and verified at that torque value using a torque analyzer.

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TBX Torque Range Lineup

2.4 N·m → 25 N·m

TBX-12 / TBX-12 ESD
[2.4 ─────────────── 12]

TBX-25 / TBX-25 ESD
[5 ─────────────────────────────── 25]

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Model Selection Guide

Need lower torque fastening for precision assembly?

Choose:

• TBX-12
• TBX-12 ESD

These models provide a torque range of 2.4–12 N·m (21.2–106.2 lbf.in) and are commonly used for electronics, communications, and precision fastening applications.

Need a medium torque production wrench?

Choose:

• TBX-25
• TBX-25 ESD

These models provide a torque range of 5–25 N·m (44.3–221.3 lbf.in) and are intended for higher torque production fastening applications.

Need ESD-safe fastening capability?

Choose:

• TBX-12 ESD
• TBX-25 ESD

These models are designed for electronics manufacturing environments requiring electrostatic discharge protection.

Need maximum head configuration flexibility?

Choose any TBX model.

All TBX tools utilize interchangeable head systems that support open-end, box-end, ratchet, box ratchet, hex key, fixed square drive, and blank-end head configurations.

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Available TBX-Series Models

Model	Item Number	Torque Range (lbf.in)	Torque Range (N·m)	End Fitting
TBX-12	076815	21.2–106.2	2.4–12	Type A
TBX-12 ESD	076818	21.2–106.2	2.4–12	Type A
TBX-25	076816	44.3–221.3	5–25	Type B
TBX-25 ESD	076819	44.3–221.3	5–25	Type B

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Interchangeable Head Options / Configuration Options

TBX wrenches utilize interchangeable head systems that allow the tool to be configured for a variety of fastening applications.

Available head styles include:

• Open-End Heads
• Box-End Heads
• Ratchet Heads
• Box Ratchet Heads
• Hex Key Heads
• Fixed Square Drive Heads
• Blank End Heads

Mountz interchangeable heads use a common centerline so torque calibration remains unchanged when swapping head sizes.

Important note:
Head interchangeability is intended primarily for recalibration and configuration—not continuous production swapping.

Type A End Fitting (TBX-12 Models)

Compatible with:

• Open-End Heads
• Box-End Heads
• Hex Key Heads
• Fixed Square Drive Heads
• Ratchet Heads
• Box Ratchet Heads
• Blank End Heads

Type B End Fitting (TBX-25 Models)

Compatible with:

• Open-End Heads
• Box-End Heads
• Ratchet Heads
• Blank End Heads

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Which TBX Model Should I Select?

Start with these questions:

• What torque value is required?
• Is ESD protection required?
• Will the wrench be used in a production environment?
• Is preventing over-torque critical to the process?
• What type of interchangeable head is required?
• Are multiple operators using the tool?
• Is repeatability more important than frequent torque adjustment?
• Is a Type A or Type B interchangeable head system preferred?

The answers to these questions will help determine the appropriate TBX-Series model for the application.

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Setup & Adjustment

Internal Torque Adjustment

TBX tools use an internal adjustment mechanism.

To adjust torque:

1. Set up the wrench on a torque analyzer.
2. Use the adjustment hex key to modify the torque setting.
3. Verify the torque value using the analyzer.
4. Seal the end cap with a calibration sticker after adjustment.

TBX tools do not feature an external torque adjustment scale.

Break Angle Adjustment

TBX-12 and TBX-12 ESD models can be configured for:

• 20° break angle
• 90° break angle

TBX-25 and TBX-25 ESD models utilize a 20° break angle.

Can Torque Be Changed Later?

Yes.

TBX tools can be reconfigured to a new torque setting using a torque analyzer and internal adjustment mechanism. Once adjusted, the wrench should be recalibrated and verified before production use.

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Use Cases (Real-World Examples)

1. Electronics Manufacturing

Problem: Small fasteners are easily over-torqued

Solution: Break-over action helps prevent continued force after target torque is reached

2. Aerospace Assembly

Problem: Torque inconsistency between operators

Solution: Preset torque and break-over indication improve repeatability

3. Medical Device Manufacturing

Problem: Quality-critical assemblies require controlled fastening

Solution: TBX tools provide repeatable torque with reduced operator variability

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Troubleshooting

Issue 1: Interchangeable head wear over time

Cause:
Repeated high-cycle use near maximum torque range or poor fastener engagement

Solution:
Inspect heads regularly and replace worn components as needed

Issue 2: Continued force after break-over

Cause:
Operator applying additional load after torque indication

Solution:
Provide operator training and verify correct fastening technique

Issue 3: Torque inconsistency

Cause:
Worn sockets, improper calibration, or side loading

Solution:
Verify calibration and inspect tooling condition

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Calibration & Standards

• ISO 6789 compliant
• ±4% torque accuracy
• Calibration life up to 4× ISO standards
• Longer calibration intervals compared to many click-type wrenches

Benefits include:

• Reduced downtime
• Lower recalibration costs
• Improved process stability

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Integration / Advanced Notes

• Mechanical torque tool system
• No electronics or data capture
• Clockwise operation only (CW)
• Designed for controlled assembly environments
• Compatible with torque analyzers and calibration systems

Recommended accessories include:

• Mountz EZ-TorQ III Torque Analyzer
• Hex step adapters
• Interchangeable head kits
• Calibration Equipment

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Media & Supporting Content

• Product datasheet
• TBX-Series product page
• Mountz TBX Break-Over Wrench Digital Brochure
• Manual

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Related Articles / Content

• How to Select a Wrench Head
• Wrench Heads Product Page
• Torque Wrench Head Selection Guide

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Need Help?

• Contact Applications Engineering for setup guidance
• Speak with Sales for product selection assistance
  • Call us:
    • North America:(408) 850-9978
    • International: +44 1428 741756