40mm (1-9/16") Rotary Hammer DH40MEY

AC BRUSHLESS MOTOR Feature
Rotary HammerFDH40MEY
Industry First/AC Brushless Motor

  • As of November 2014. Among rotary hammers made by leading power tool manufacturers, surveyed by Koki Holdings.

Maintenance-free

  • 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.



    Industry First/AC Brushless Motor

Fastest drilling speed in its class * even at voltage drops

Efficient brushless motor offers higher drilling performance even with an extension cord.


  • As of November 2014. Among 40mm class rotary hammers made by leading power tool manufacturers, surveyed by Koki Holdings.

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

Highest *1 Demolition Performance and Fastest *1 Drilling Speed in its class

  • Acheived by high efficiency brushless motor and optimised hammering mechanism.

    Highest Demolition Performance / Fastest Drilling Speed in its class
    1. As of November 2014. Among 40mm class rotary hammers made by leading power tool manufacturers, surveyed by Koki Holdings.
    2. A comparison of the model DH40MEY and the previous model DH40MRY. The results may vary depending on operating conditions.
    3. A comparison of the model DH40MEY and the previous model DH40MRY. Mean value for drilling into concrete with drill bits between 16mm and 40mm diameters. The results may vary depending on operating conditions.
Reduced vibration and improved operating efficiency

User Vibration Protection
  • A comparison of the model DH40MEY and the previous model DH40MRY. The results may vary depending on operating conditions.

Our original, spring-type dynamic vibration absorber

  • Our original, spring-type dynamic vibration absorver with a weight and two springs moves in the opposite direction to the vibration direction of the main body. This results in reduced vibration and improved operating efficiency.

    Spring-type dynamic vibration absorber

Vibration-absorbing handle

Vibration-absorbing mechanism with the transatory unit and the Neidhardt spring provides high vibration-absorbing effect.

High durability

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

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

    Almimium Housing Body
Improved handling

Push-button, constant speed control with variable speed

  • Equipped with a 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 250 / min 330 / min 410 / min 500 / min
    Full Load Impact Rate 1,430 / min 1,900 / min 2,370 / min 2,850 / min
    Switch-type, constant peed control with variable speed

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

  • Up-sized mode change lever is located on the top of the tool body for easier operation.

    Large change lever

Large trigger switch

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

    Large trigger switch

Specifications

Capacity Drill bit: 40mm (1-9/16")
Core bit: 105mm (4-1/8")
Power Input 1,150W
Bit Shank SDS max
No Load Speed 250 - 500 / min
Full Load Impact Rate 1,430 - 2,850 / min
Overall Length 477mm (18-4/5")
Weight (including side-handle) 7.5kg (16.5 lbs.)
Vibration Total Values
(triax vector sum)*
Hammer drilling
into concrete
Vibration emission value : ah, HD = 8.0m/s2
Uncertainty K = 1.5 m/s2
Equivalent chiselling value Vibration emission value : ah, CHeq = 7.3m/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.