10.8-12V Peak Cordless Rotary Hammer DH12DD

  • 18V Cordless Rotary Hammer:DH12DD
  • 10.8-12V PeakLi-ion battery

  • Brushless Motor
  • Low Vibration Handle
  • Reactive Force Control
  • SDS Plus Shank

Compact, Lightweight, and Well-balanced

  • Users feel less fatigue due to the compact, lightweight and well-balanced design with most of the weight positioned close to the hand.

    • With BSL1240M Battery (inc. Side Handle)
    Weight is 1.9 kg.

Class-Leading*1 Drilling Speed

The DH12DD is suited for drilling small holes into concrete, completing the job faster than corded counterparts.

  • As of October 2020. Among cordless rotary hammers in the same class (10.8 - 12V Peak DH 12DD [2-mode] : 13 - 18mm) made by leading power tool manufacturers. (Survey by Koki Holdings)

Low VibrationLow Vibration Handle (LVH)

  • The low vibration handle provides rubber handle dampers to absorb vibrations and shocks during operation.

    Image of rubber handle dampers

    Image of DH18DPA

Bright LED Light

  • Illuminates the spot you are working on.

    Image of LED Light

2-step Rotation Speed for Different Applications

  • Makes it easy to drill a fragile material by pressing the changeover switch to reduce the rotation speed and impact rate.

    Image of Changeover Switch, Display Lamp

Built-in Auto Stop Function for Consistently Drilling Holes

  • Once the initial drilling time is recorded on the tool, the motor is designed to automatically stop when the recorded time has passed, enabling a stable and efficient continuous operation.

    Image of the case
The auto stop function is used to record the drilling time. Thus, it may not provide the same drilling depth owing to the operator position, pushing force, and variation among the workpieces. Please use a depth gauge to ensure the drilling depth.

Reactive Force Control(RFC)Against Sudden Overburdening

  • When the tool bit is suddenly overburdened during operation, the slip clutch works or the built-in controller stops the motor output before the entire tool jerks.

    RFC explanatory illustration
    Depending on the operating conditions, the Reactive Force Control function may not work or provide the specified performance. Please make sure that the workpiece is placed and supported properly, and that the main unit is held firmly during operation.

12V PEAK Slide Lithium-Ion Batteries

  • BSL1240M

    4.0Ah / BSL1240M

  • BSL1225M

    2.5Ah / BSL1225M

  • BSL1215

    1.5Ah / BSL1215

Lightweight. Compact. High-Capacity*.

  • Applies to the BSL1240M.

Clear Battery Status Indication (BSL1240M / BSL1225M only)

  • The remaining battery indicator lamp shows not only charge level but also battery overheating and failure when they occur.

    Remaining battery indicator lamp / Remaining battery indicator switch
Indicator Lamp




Battery Charge State 75% and above 50% - below 75% 25% - below 50% Below 25% 0%
Indicator Lamp

Battery Charge State Output suspended due to high temperature*1 Output suspended due to failure*2
  1. Remove the battery from the tool and allow it to cool down fully.
  2. The problem may be with the battery so please contact your dealer.

Class-leading* Charging Speed

  • Approx. 60min with BSL1240M Battery

    Approx. 37min with BSL1225M Battery

    Approx. 22min with BSL1215 Battery

    Fast Charger

    Fast Charger

  • As of November 2018, among 10.8V slide Lithium-ion batteries made by leading power tool manufacturers. (Survey by Koki Holdings)

BSL1240M / BSL1225M / BSL1215 12V Peak Slide Lithium-ion Battery

Model BSL1240M BSL1225M BSL1215
Voltage 10.8 - 12V Peak
Capacity 4.0Ah 2.5Ah 1.5Ah
Charging Time at 20℃* Approx. 60min
(with UC12SL)
Approx. 37min
(with UC12SL)
Approx. 22min
(with UC12SL)
Dimensions (L x H x W) 91 x 45 x 74mm 86 x 42 x 65mm 86 x 42 x 65mm
Compatible Charger UC12SL
  • The charging time may vary depending on the operating conditions and battery state.

Runtime per Charge*

Work Ah Runtime per Charge*
Concrete Drilling (30mm in Depth) Φ 6mm Drill Bit 4.0Ah Approx. 102 Holes
Φ 10.5mm Drill Bit 4.0Ah Approx. 55 Holes
  • The values are shown for reference purposes and may vary according to materials and conditions.


Capacity Concrete 18mm
Steel 13mm
Wood 18mm
Battery Voltage 10.8-12V Peak
Bit Shank SDS-plus
Impact Energy*1 1.2J
No Load Speed Normal 0 - 1,080/min
Low 0 - 800/min
Full Load Impact Rate Normal 0 - 5,500/min
Low 0 - 4,100/min
Overall Length 246mm
Weight*2 2.0 - 2.1kg
2.1kg (with BSL1240M)
Vibration Total Value
(triax vector sum) *3
Hammer Drilling
into Concrete
Vibration emission value ah, HD = 9.1 m/s2
Uncertainty K = 1.5 m/s2
Standard Accessories *4 2 Batteries (BSL1240M), Charger (UC12SL),
Side Handle, Depth Gauge, Battery Cover, Carrying Case
  1. Impact energy according to EPTA-Procedure 05 (Ver.2.0).
  2. Weight according to EPTA-Procedure 01/2014. Weight varies depending on the battery used.
  3. The vibration total values were determined according to EN60745.
  4. Standard accessories vary by country or area.

Optional Accessories

  • Belt Hook (Optional)

    Users can hook the tool to their belt loop when it is not in use.
    Hook (Code No.372200)
    Screw (Code No.337357)

    Image of Hook
  • Please contact local dealers for product availability and product details.