Rotary Hammer DeWalt DCH911NK 54V XR SDS‑MAX 27 J Cordless Demolition

The Rotary Hammer DeWalt DCH911NK 54V XR SDS‑MAX 27 J Cordless Demolition is a battery-powered tool engineered for heavy chiselling and breaking in concrete and masonry. Part of the 54V XR range, it combines a brushless motor with an SDS‑MAX bit system to deliver up to 27 joules of impact energy for demanding demolition tasks where mains power is unavailable. The tool features variable speed control and a robust housing designed for regular on-site use by contractors and renovation professionals.

Advantages

This cordless demolition rotary hammer provides high-impact performance comparable to corded units while offering the mobility of battery operation. The brushless motor improves efficiency and reduces maintenance, and the SDS‑MAX interface ensures secure bit retention and fast bit changes. Variable speed control allows precise regulation of impact rate for different materials and tasks, and the durable housing protects internal components against jobsite conditions.

Suitable for

• Demolition of concrete slabs, walls and foundations
• Heavy chiselling and removal of masonry
• Contractor and renovation projects without ready access to mains power
• Preparing openings for plumbing or electrical installations

Key specifications

• Impact energy: 27 J
• Power system: 54V XR battery platform (battery sold separately)
• Bit system: SDS‑MAX
• Motor type: brushless
• Variable speed control for impact rate
• Robust housing for jobsite durability

How to use

Select a suitable SDS‑MAX bit and insert it into the chuck, ensuring it locks securely. Fit a charged 54V XR battery according to manufacturer instructions. Set the variable speed or impact rate appropriate for the material and begin work by applying steady pressure, allowing the tool's impact energy to break or chip the substrate. For chiselling, use controlled, guided strokes; for drilling or breaking larger sections, maintain consistent contact and let the rotary hammer deliver its impact force. Always follow safety procedures such as securing workpieces and keeping bystanders clear.

Usage recommendations

Use appropriate personal protective equipment including eye and ear protection, dust mask, and gloves. Choose the correct bit type and size for the application and inspect bits for wear before use. For extended periods of operation, monitor battery charge and allow periodic cooldowns to preserve motor and battery life. Store the tool and batteries in a dry, ventilated area when not in use.