Torque management nuts that prevent human error. They help prevent forgetting to tighten and keep the tightening torque within the appropriate range.
When the cap set on the nut reaches the appropriate torque, the inner claws break, and the cap spins freely to indicate that the installation is complete. A capped state means it has not been installed. The work is completed when the cap comes off and the nut is exposed. This prevents not only forgetting to tighten or insufficient tightening but also seizing due to over-tightening. It is possible to tighten with the appropriate torque using only an impact wrench, without the need for a torque wrench or special tightening machinery.
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basic information
There are various types of locking nuts with different anti-loosening functions in the world. All locking nuts exhibit their anti-loosening function when tightened to the appropriate torque value. However, if the operator forgets to tighten them, the anti-loosening function will not be activated. Conversely, over-tightening can lead to issues such as seizing. To prevent human error in advance, KFC has developed a nut that combines unprecedented resin products with steel products to add torque management functionality. A polycarbonate cap is set with the locking nut. When the specified torque is reached, the contact area between the inside of the cap and the nut breaks, causing the cap to spin freely and detach, thus completing the installation at the proper torque value. The Torcia Nut "K" is set with our anti-loosening K nut. The Torcia Nut "ZK" is set with our washer-equipped anti-loosening K nut.
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Applications/Examples of results
Construction projects with a large amount of fastening work Projects with strict time constraints that require speeding up Projects that particularly need to consider human errors such as forgetting to tighten or over-tightening Projects where efficiency in fastening and inspection work in high places or difficult locations is desired are suitable for this. It is especially recommended for projects that require torque management after construction and for those that do not rely on skilled workers. It is used in construction projects such as highway signs and facilities that require strict torque management.
Detailed information
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Torsion nut cap
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Locking K nut
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K nut with washer for preventing loosening
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Torsion Nut Installation Method Diagram
Line up（5）
| Model number | overview |
|---|---|
| TNK8 | A locking nut K nut (M8, SUS304) is included. |
| TNK10 | A locking nut K nut (M10, SUS304) is included. |
| TNK12 | A locking nut K nut (M12, SUS304) is included. |
| TNZK 8 | This product is made to order. A K nut with washer (M8) is included. |
| TNZK 10 | This product is made to order. A K nut with washer (M10) is included. |
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Company information
As a pioneer in post-installed anchors in Japan, KFC was established in 1965. We respond to customer needs with a consistent system from product development to sales and construction. Our business activities are centered around three main areas: construction fastening materials such as post-installed anchors, materials for tunnel excavation like rock bolts and auxiliary methods, and various construction works related to seismic reinforcement, safety measures, equipment, and refreshment.