Instrumented Rockbolts (VW)

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The Model 4910 Instrumented Rockbolt comprises a vibrating wire strain gauge located inside a short length of standard threaded rockbolt or rebar. This short length is then connected via a coupling to a longer length of the same bolt material. The instrumented rockbolt is installed in the same manner as conventional rockbolts, making sure that the strain gauge remains located within the loaded part of the rockbolt.


  • Standard Range : 2500 µε, equivalent to around 27,215 kg in a 25 mm Ø bolt
  • Resolution : 0.5 µε, equivalent to around 5 kg in a 25 mm Ø bolt
  • Accuracy : ±0.25% F.S.
  • Linearity : ±0.5% F.S.
  • Output : 1400-3000 Hz
  • Temperature Range : −20 to +80°C
  • Bolt Sizes : 25 mm, #8 rebar, and larger
  • Length : 300 mm (standard)


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