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Vibrating Wire Strain Gauges for Bridge, Tunnel & Dam Monitoring: Complete Selection Guide
The global construction industry is experiencing a massive surge in large-scale infrastr...
Precision Thru Hole Load Cells for Structural Monitoring
thru hole load cells
Force measurement in applications where a rod, cable, or bolt passes through the sensor demands a different design approach. Thru hole load cells solve this by allowing the load-bearing element to run straight through the center, capturing tension accurately without altering the load path. These sensors are used on construction sites to verify anchor bolts, in wind turbine foundations, and anywhere structural integrity depends on knowing exactly what’s happening at the tie-down point. Kingmach has built a range of thru hole load cells specifically for these fieldwork-heavy environments. Most models share a compact form, robust sealing against moisture and dust, and straightforward integration with common readout equipment. Rather than a one-size-fits-all product, we treat each inquiry as a request for a sensor that has to work in a real setting: a certain bolt diameter, a certain expected load range, a certain wiring constraint. That’s why our catalog extends from small-bore designs to high-capacity units, with custom machining available when standard dimensions fall short. The result is measurement gear that fits into daily practice, not just a lab bench.
Technical Detail
Configured around process stability, mold life, and long-term uptime.
Thru hole load cells from Kingmach are built around a simple idea: if you need to measure tension in an anchor, you shouldn’t have to fight the sensor to make it fit. The annular design lets a threaded rod, cable, or bolt pass through, with strain gauges bonded inside the body to convert deformation into a clean electrical signal. This is the kind of sensor that ends up in rock bolt testing, pile load checks, and stay cable monitoring. Wide product range means we don’t force a limited catalog onto every project. Standard models come in capacities from a few kilonewtons up to several meganewtons, with bore sizes matched to common thread diameters. For high-cycle or outdoor use, stainless steel versions with IP67-rated seals are typically specified; for less demanding indoor setups, alloy steel may be a cost-effective choice. Customization available for specific project requirements covers more than just capacity and bore—we regularly adjust output signal compatibility, cable length, and mechanical interfaces. Global distribution network means shorter lead times and local support, whether the job is in Southeast Asia, Europe, or North America. Technical support and after-sales service often involve helping field engineers with shunt calibration, wiring for their data loggers, or troubleshooting installation issues. The result is a sensor that doesn’t just deliver a spec sheet number; it holds up under site conditions and keeps delivering data the crew can rely on.
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Common technical questions
What’s the main reason to choose a thru hole load cell instead of a conventional load button or canister style?
When the load is applied through a bolt, cable, or tendon, a thru hole load cell lets that element pass through the center. This keeps the measurement in line with the force axis without creating bending moments the way an offset sensor might. It’s really about avoiding extra fixtures and keeping the load path clean.
Are these sensors only for high-capacity applications like bridge strand monitoring?
Not at all. While we do make large-bore, high-capacity models for structural work, the same design is used in small-scale test rigs and product validation, sometimes with capacities under 50 kN. Bore size often dictates the physical application more than the load range does.
Can I get a thru hole load cell that’s submersible or fully sealed for outdoor use?
Yes, many models are available with IP67 or IP68 sealing, using stainless steel bodies and welded construction. We typically discuss the expected exposure—rain, dust, temporary submersion—and recommend a protection rating and cable gland that match.
How do I specify the right bore size for my anchor rod?
You’ll need the rod’s outer diameter and thread type. We usually pick a bore about 2-3 mm larger than the rod to allow for easy installation without excessive play. Send us the details of what you’re measuring, and we’ll help nail down the fit.
What sort of output signal do these load cells provide, and can I use them with my existing data logger?
The standard output is millivolt per volt, which works with most strain gauge readout devices. If you need a digital signal or a 4-20 mA transmitter for long cable runs, we can discuss integrating a signal conditioner into the sensor or providing a separate module.
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