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Load Cells

Instrumented Rockbolts (VW) | Model 4910

  • Model 4910 Instrumented Rockbolt components (front to back: nut, rockbolt and mounting plate).
  • Model 4910 Probe shown with the Geokon Model GK-404 Vibrating Wire Readout.
Model 4910

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
0.5 µε, equivalent to around 5 kg in a 25 mm Ø bolt
±0.25% F.S.
±0.5% F.S.
1400-3000 Hz
Temperature Range
−20 to +80°C
Bolt Sizes
25 mm, #8 rebar, and larger
300 mm (standard)

Please Note: GEOKON maintains an ongoing policy of design review and reserves the right to amend products and specifications without notice. Various instruments are discontinued over time and replaced with new, updated models.