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Impact Wrench ST-IW1640

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Key Features
  • Square Drive: 1/2 inch
  • Max Torque: 850 ft-lbs
  • R.P.M: 10,000


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  • Comfortable ergonomic handle
  • Sensitive Trigger allows control of speed 
  • One year Warranty
  • Adjustable torque
  • One hand Forward/Reverse Switch 
  • Max torque in reverse for removal of fasteners 
  • Exhaust at end of handle 
  • 360 Degree air inlet
  • Square Drive: 1/2 inch
  • Recommend Air pressure: 90 psi 
  • Max Torque: 850 ft-lbs (working torque 660ft lbs)
  • R.P.M: 10,000
  • Weight: 4.6 lbs
  • Overall Length: 7.5in
  • Air Inlet: 1/4 in
  • Air Hose: 3/8 in
  • Air Consumption: 17 cfm 

The ST-IW1640 is a professional 1/2″ composite air impact wrench from Sumake’s Pro Line.  It has a max torque of 850 ft-lb and an ergonomic design. Sumake’s impact wrenches lead the world in ease of use, ergonomics, motor power, noise reduction, and reliability.   

This model is an economical solution for professional users who need the tool to deal with general nut tightening and loosening applications such as passenger vehicle tire change or general facility maintenance.