45mm (1-3/4") Rotary Hammers DH45ME/DH45MEY

  • Rotary Hammer DH45ME/DH45MEY


  • Rotary Hammer DH45ME/DH45MEY


AC Brushless Motor


  • The product life cycle is significantly extended by eliminating troubles with armature burnout, layer short and commutator wear. Besides, no carbon brush replacement is required.

    AC Brushless Motor

Fastest drilling speed and highest demolition performance in its class even at voltage drop

The efficient brushless motor offers higher drilling performance even with an extension cord used.

Compatible with engine generators

Designed to be powered by engine generators as well, thanks to Our original compact and high efficiency inverter circuit.

Fastest drilling speed and highest demolition performance in its class

Fastest* drilling speed and highest* demolition performance in its class

The high efficiency brushless motor and the optimized hammering mechanism achieve the fastest drilling speed* and the highest demolition performance* in its class.

  • As of March 2015. Among 45mm class rotary hammers made by leading power tool manufacturers, surveyed by Koki Holdings.
Reduced vibration and improved operating efficiency

Our original, pendulum dynamic vibration absorber (Only for DH45MEY)

  • reduces the vibration from concrete drilling or chiseling by moving a weight and a leaf spring in the opposite direction to the movement of the hammer.

    Pendulum dynamic vibration absorber

Vibration-absorbing handle

provides high vibration-absorbing effect by employing both transatory and hinge units.

High durability

The internal double-insulation construction with a very sturdy aluminium die-cast body and a plastic internal stator holder

  • makes the housing more rigid, significantly enhancing durability of the motor unit.

    Alminium housing body
Improved handling

Control panel

  • Control panel

    1. Push-button, constant speed control with variable speed
    Due to the built-in electronic control circuit that can adjust the impact rate according to applications, four-step impact rates can be selected by the rotation speed selector switch.

    Display Lamp
    No Load Speed 110V
    120/min 170/min 220/min 270/min
    120/min 180/min 240/min 310/min
    Full Load Impact Rate 110V
    1,200/min 1,600/min 2,100/min 2,500/min
    1,200/min 1,700/min 2,300/min 2,950/min
  • 2. Power Lamp
    lights up when the plug is inserted into an outlet.

One push action for quick bit mounting

  • A bit can be mounted by simply inserting it into the tool holder.

    One push action for quick bit mounting

Large change lever

  • An up-sized mode change lever is located on the top of the tool body for easier handling.

    Large change lever

Large trigger switch

  • Upsized, easy-to-grip trigger switch for more control.

    Large trigger switch

Continuous operation function (available for the Hammering Mode)

  • keeps the tools running even after the trigger switch is released, making chiseling easier.

    Continuous operation function


Model DH45ME DH45MEY
Capacity Drill bit: 45mm (1-3/4")
Core bit: 125mm (4-29/32")
Power Input 1,500W
Bit Shank SDS max
No Load Speed 110V, 120V, 127V: 120 - 270/min
220V, 230V, 240V: 120 - 310/min
Full Load Impact Rate 110V, 120V, 127V: 1,200 - 2,500/min
220V, 230V, 240V: 1,200 - 2,950/min
Overall Length 535mm (21-1/16")
Weight (including side-handle) 9.0kg (19.8lbs.) 9.5kg (20.9lbs.)
Vibration Total Values
(triax vector sum)*
Hammer drilling
into concrete
Vibration emission value : ah, HD = 13.5m/s2
Uncertainty K = 1.5 m/s2
Vibration emission value : ah, HD = 8.8m/s2
Uncertainty K = 1.5 m/s2
Equivalent chiselling value Vibration emission value : ah, CHeq = 14.2m/s2
Uncertainty K = 1.5m/s2
Vibration emission value : ah, CHeq = 9.2m/s2
Uncertainty K = 1.5m/s2
Standard Accessories Side Handle, Stopper, Rotary Hammer Grease A, Carrying Case
  • The tri-axial vibration values were measured according to EN60745-2-6.
  • Please contact local dealers for product availability and product details.