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Vibrating Wire Strain Gauges for Bridge, Tunnel & Dam Monitoring: Complete Selection Guide
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Donut Load Cells: Monitoring Bolt Forces with Confidence
donut load cell
When tension needs to be measured in a bolted assembly, a donut load cell offers a straightforward solution. It fits directly under a nut or between flanges, turning the bolt itself into a force sensor. This passive, strain-gauge-based design is widely used in structural health monitoring projects—think bridge stay cables, wind turbine foundations, or tunnel supports. Kingmach supplies these robust donut load cells for demanding geotechnical and infrastructure applications, offering customizable designs, reliable accuracy, and global technical support.
Technical Detail
Configured around process stability, mold life, and long-term uptime.
Kingmach donut load cells (also known as ring-type or through-hole load cells) are designed for precise bolt tension and compression measurement in structural and geotechnical monitoring. Manufactured with high-quality materials and strain gauge technology, they ensure long-term stability and repeatability. Available in various capacities and sizes, they can be customized to fit specific bolt diameters and project requirements. Common applications include monitoring anchor bolt forces in dams, tunnels, and bridges, ensuring structural integrity and safety. Our donut load cells are easy to install, requiring minimal modification to existing assemblies. With a global distribution network and dedicated technical support, Kingmach provides reliable solutions for your load monitoring needs. Contact us to discuss your project and request a quote.
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View DetailsFAQ
Common technical questions
What is a donut load cell and how does it work?
A donut load cell is a ring-shaped force sensor that measures tension or compression in a bolt or cable. It is installed around a bolt, under the nut or between flanges, and uses strain gauges to detect deformation when force is applied, converting it into an electrical signal proportional to the load.
What are typical applications for donut load cells?
Donut load cells are commonly used in structural health monitoring for bridges, tunnels, dams, and wind turbines. They measure bolt tension in foundation anchors, stay cable forces, rock bolt loads, and ensure the integrity of critical connections.
Can Kingmach customize donut load cells for my project?
Yes, Kingmach offers customization services including non-standard capacities, sizes, mounting configurations, and output signals to meet specific project requirements. Contact our team with your specifications.
What output signals do your donut load cells provide?
Standard donut load cells provide millivolt signals (mV/V) compatible with most data loggers. Upon request, we can integrate signal conditioning to output 4-20mA, 0-5V, or digital interfaces.
How do I install a donut load cell?
Installation is straightforward: the load cell is placed over the bolt, typically under the nut or washer, and tightened to a specified preload. It is essential to follow the calibration and installation guidelines provided by Kingmach to ensure accurate measurements.
Need a solution for your project?
Share your product type, target capacity, and application requirements. Our team can review the details and recommend a practical next step.