General Info

These Force Sensing Bolts are available from ¼” diameter up to 1 ½” diameter, and are available in many different lengths. They are typically grade 9, (180 KSI) high strength alloy steel and they are intended for use in applications where hex head bolts are used.


The gauging process consists of the installation of foil type bonded strain gages in a small hole drilled along the longitudinal neutral axis of the bolt. This method compares favourably in accuracy and stability with the best external gauge installations, but is vastly superior to external gauge installations in mechanical and environmental ruggedness and miniaturisation since the internal strain gauge installation is self-protecting.

In most bolts, neither the gauge or the drilled hole reduce the allowable bolt load in a Strainsert fastener. The hole depth is confined to the shank of the bolt, and the hole diameter is controlled so that the bolt cross-section through the threads is smaller than the section through the shank with the gauge hole. Therefore, the gauge installation will withstand and accurately indicate high strength loads.

Some Features Include:

  • To measure accurate preload, service load and overload of bolted assemblies
  • For maximum uniformity, efficiency and reliability in bolted assemblies
  • For effective research, testing and manufacturing of bolted assemblies

Contact Hylec Controls for a quotation today!

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