Mountz break-over wrenches stop over-tightening at the source: when the fastener reaches the set torque, the head pivots and the operator feels the wrench give way. Because almost no extra torque passes through after the break, they suit low-torque, high-consequence joints in electronics, medical devices, aerospace and telecom. Phil Industries, an authorised Mountz distributor in Singapore, supplies the TB, TBIH, TBX and MMTB families with matching heads, demonstrations and after-sales support.
What people call a breaking torque wrench
Buyers search for this tool under several names: breaking torque wrench, breakover wrench or break-away wrench. They all describe the same mechanism. In contrast to a click wrench, which only signals and then lets the operator keep pulling, a break-over wrench physically deflects, so the signal and the stop happen together.
The four Mountz break-over families
| Model | Range | Head | Typical use |
|---|---|---|---|
| MMTB preset break-over wrenches | 5.6 – 56.4 cN·m | Fixed, preset | Micro fasteners on PCBs, optics and connectors |
| TB break-over wrenches (fixed head) | 17.7 – 565 cN·m | Fixed open-end or box | Single fastener size on a production line |
| TBIH break-over wrenches (interchangeable head) | 17.7 – 565 cN·m | Interchangeable TBIH heads | Several fastener sizes, one calibrated handle |
| TBX break-over wrenches | 2.4 – 25 N·m (TBX-12 and TBX-25, ESD versions available) | Interchangeable TBX-12 / TBX-25 heads | Higher-torque connectors, brackets and EPA lines |
Heads and accessories
The TBIH and TBX handles take open-end, box-end, flare, ratchet, hex-key and blank heads, so you can cover SMA and N-type RF connectors, hydraulic flare nuts and hex fasteners with one wrench. Browse the Mountz wrench heads, then add head protection covers for delicate surfaces. However, if the joint needs more than 25 N·m, the FGC cam-over wrench gives the same cannot-over-torque behaviour up to 75 N·m.
Where break-over wrenches fit in Singapore
Telecom and RF assemblers use them on SMA connectors, where a few cN·m too many cracks the dielectric. Medical device and aerospace lines use them because the wrench enforces the specification rather than relying on operator feel. Similarly, semiconductor equipment builders use the TBX ESD versions inside electrostatic protected areas. For an overview of the other mechanisms, see the Mountz torque wrenches page and our engineers’ guide on torque control basics.
Frequently asked questions about break-over wrenches
Is a breaking torque wrench the same as a break-over wrench?
Yes. Breaking, break-over, breakover and break-away all describe a wrench whose head deflects at the set torque. Mountz uses the term break-over.
Can a break-over wrench be adjusted?
The TB, TBIH and TBX models are adjustable within their range using the wrench adjusting key, and the setting sits behind a cover so operators cannot change it casually. The MMTB is preset for a single value.
Which model do I need for SMA or RF connectors?
Most stainless-steel SMA specifications call for 0.9 – 1.1 N·m (brass connectors are lower), which sits inside the TB and TBIH range with an open-end head. Tell us the connector standard and we will match the head size.
How accurate are Mountz break-over wrenches?
They are built to ISO 6789 accuracy requirements and ship with a calibration certificate. You can verify them in-house on a Mountz torque analyzer.
Call +65 6555 1745, WhatsApp +65 9853 9030 or email sales@phil-industries.com.sg for a quotation, a demonstration or help choosing the right model.
