Screw Withdrawal Force Meter
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Screw Withdrawal Force Meter | Fakopp

The force required for screw withdrawal serves as an indicator for wood strength, density, and shear modulus. To facilitate this measurement, Fakopp Enterprise has introduced a portable screw withdrawal force meter, utilizing a 4mm diameter screw with an 18mm thread length. Although the screw withdrawal force is a localized parameter, selecting a representative location on a beam can yield valuable insights for evaluating wooden structures.



Drive the screw into the wood material perpendicular to its surface. Connect the force transducer's cable to the R320 display unit. Switch on the unit by holding down the "ON" button for 3 seconds and select the Peak hold function. Initiate the screw withdrawal process by positioning the mechanics over the screw, capturing the screw head with the fork of the force transducer. Rotate the handle slowly in a clockwise direction until the screw is fully removed, maintaining a withdrawal speed of approximately 0.5 mm/s. Record the maximum force value and press the "Max" button to reset the display before conducting the next test.

  • Force transducer capacity: 5 kN (survives 10kN)
  • Temperature sensitivity: less than 0.005%/Ko
  • Hysteresis error: less than 0.05%
  • Repetition error: less than 0.03%
  • Operating temperature: -10 °C to +40 °C
  • Resistance: 350 Ω
  • Material: steel
  • Manufacturer: Kaliber MM Kft., Budapest, Hungary
  • Force meter resolution: 5 N
  • Display unit operation temperature: +10 °C to +40 °C
  • Battery: 4 pieces of AA size 1.5 V battery


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