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Torque Arm

Positech’s pneumatic ReactionArm® (RA), a torque reaction arm, absorbs shock, torsional forces and impact force from power tools; therefore, reducing carpal tunnel injury and cumulative trauma disorders. This reaction arm moves up and down without pushing any buttons with very little effort and prevents any force of the power tool through the workers’ wrists, arms and upper bodies by absorbing the shock of the attached power tool. A power tool mounted on a Reaction arm can easily be moved and positioned throughout the work cell. A variety of styles, capacities and mounting options provide versatility.

ReactionArm ReactionArm
ReactionArm ReactionArm
ReactionArm ReactionArm
Cut Sheet Tech Specs
Torque Capacity ft-lbs.
Lift Capacity lbs.* Vertical Travel in. Reach Range in. 2D Drawings 3D Model Installation Manual
RA RA250
20 20 36-72 RA250.dwg RA250.sldprt RA250 RA250
RA RA500
150 12-42 36-96 RA500.dwg RA500.sldprt RA500 RA500
RA RA1000
110-115 36-60 84-144 RA1000.dwg RA1000.sldprt RA1000 RA1000
RA RA3000
20-400 36-66 84-144 RA3000.dwg RA3000.sldprt
RA3000 RA3000
RA RA6000
300-640 42-66 108-180 RA6000.dwg RA6000.sldprt RA6000 RA6000

Requires 90 psi (6.21 bar) clean, dry air to operate at rated capacity

*Includes payload and power tooling; increasing arm length reduces payload capacity. Lift capacity dependent upon arm length.

To download the PDF of a model above, please click on the cell containing the model name


  • 5:1 design factor minimum on all structural components
  • Main post adjustable friction brake allows the operator to set arm motion for ease of operation
  • Reduces repetitive shock force to wrists, arms and upper bodies
  • Pilot operated lock valve on lift cylinder prevents vertical arm movement if sudden loss of air pressure occurs
  • Minimum Lift Circuit is standard, allowing controlled downward movement
  • Floor mounted pedestal provided with concrete anchor bolts, mounting hardware and leveling jacks for ease of installation (No grout required)
  • Full turn-key or integration of customer supplied torque equipment
  • Parallel linkage is standard to support loads beyond end-of-arm
  • Does not require air lubricator


  • Balance configuration for ‘zero gravity’ control
  • Variety of tool holder designs and end joints available or special designs provided
  • Work tools and stands that are incorporated into the work cell can be provided
  • Vertical axes brakes available
  • Pneumatically operated, requires clean dry input pressure
  • Precision bearings and thrust washers at rotation axes for smooth motion and long life
  • Middle joint leveling to prevent second arm drift
  • Remote Start Circuitry available to ensure brakes are engaged prior to vertical torque
  • Optional bias circuitry allows for operator ease during vertical torque
  • Standard pistol grip or optional ergonomic twist grip controls
  • Mounting Options: overhead, trolley, pedestal, wall mount, column, machine or mobile/portable base


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