Diamond Coring Motor, 300/600 RPM, 20 Amp with Shear Pin

Cat # 4079


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What's Included

Diamond coring motors are used with Vac-U-Rig® and Dymorig diamond core rigs to drill holes into reinforced concrete. This 20 amp model features 4.8 peak horsepower with a 300 rpm or 600 rpm operating speed. The 4079 uses a shear pin to protect gears and motor against overload. Shear pins are easily replaced and extra pins are included with the unit. This unit will handle core bits from 4 in. to 14 in. in diameter.


  • Two speeds: 300 and 600 rpm
  • 20 amp motor
  • Shear pin protection protects gears and motor
  • Built-in water swivel


Weight 24.0 lbs
Voltage 120V
Tool Warranty 5 Years
No Load RPM 300-600
Amps 20
Spindle 1-1/4"-7
Max HP 4.8
Motor Protection Shear Pin
Plug Type L5-20P
Suggested Dia in Med Aggregate 7"-14" / 4"-7"

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