Rock Direct Shear Testing Equipment
RDS-100 Direct Shear Testing System

The GCTS RDS-100 Rock Direct Shear Testing System is a simple, manually operated, and inexpensive apparatus for testing a variety of rock specimen configurations. The direct rock shear tester features electronic and digital displays to monitor loads and deformations while automatically logging data which organizes the test data. Perfect for direct shear testing.


  • Manual control of double acting (push/pull) 100 kN (10 ton) shear load actuator with 25 mm stroke & 50 kN (5 ton) normal load capacity with 25 mm stroke.
  • Normal load stiff reaction frame mounted on sliding bearings to minimize horizontal friction while keeping the normal load vertical throughout the full shear displacement.
  • 150 mm (6") inside diameter sample rings for specimens up to 150 mm high.
  • Precise Digital Display with Peak Value Memory.
  • A/D Automatic Data Acquisition with USB interface.
  • Utilizes Windows software for automatic data logging and reporting of direct shear tests with real time graphical display of test progress.
  • Economically priced.



The GCTS Direct Shear System for Testing Rocks is a simple and inexpensive device for testing a wide range of rock specimen configurations. Cylindrical cores, cubes, prisms, and rock fragments can be used to determine the shear strength.


This system features electronic sensors and digital displays to monitor the loads and deformations. A standard A/D automatic data acquisition with USB interface is included with the system to automatically log and reduces the test data. The included software program accepts inputs from the shear and normal load sensors, the shear deformation, and up to four normal deformation sensors (the software calculates automatically the average normal deformation).


Two air/oil booster pumps operating from 800 kPa (100 psi) compressed air allow the user to set easily set and maintain the normal load and the shear displacement rate. Pressure sensors are used to monitor the loads but load cells are also offered as an option. The shear pump includes a 4-way valve to easily reverse the loading direction. The air/oil booster pumps, digital displays, and all the control valves are set on a easy-to-use front panel housed in a metal cabinet.


Specimens are cured within removable specimen rings and then drop inside the shear box allowing the preparation of multiple specimens using additional rings increasing test production.


GCTS also offers a fully computer-controlled servo-hydraulic direct shear machine (see RDS-200)



  • 150 mm maximum specimen diameter
  • 150 mm maximum specimen height
  • 100 kN shear load capacity
  • 50 kN axial load capacity


Please contact GCTS for full specifications.