Coroa de perfuração diamantada Dedra HW4187 — coroa de perfuração diamantada para betão e tijolo, diâmetro 187 mm / comprimento 400 mm

Diamond core bit Dedra HW4187 is a professional diamond drill core made for creating precise circular holes in concrete and brick. With a diameter of 187 mm and an overall length of 400 mm, this core bit is intended for use with compatible core drilling machines and rigs. It is designed to cut through masonry and reinforced concrete for openings required by plumbing, electrical installations, ventilation ducts, and other construction tasks.

Advantages

The Dedra HW4187 diamond core bit provides accurate, clean-cut holes with minimal chipping on the edges of the drilled opening. Its diamond-segment cutting edge offers consistent performance and extended life when used under recommended conditions. The rigid steel body keeps the segment alignment stable during operation, supporting efficient drilling progress and reliable removal of the core. Overall design focuses on compatibility with standard wet drilling setups and robust tasks on concrete and brick.

Suitable for

• Creating openings in reinforced concrete walls and floors
• Drilling holes in brick and masonry for pipe and conduit installation
• Making precise circular cuts for ventilation and HVAC ducts
• Core sampling and removal of concrete plugs in renovation projects

Key specifications

• Cutting diameter: 187 mm
• Overall length: 400 mm
• Intended material: concrete and brick (including reinforced concrete)
• Cutting edge: diamond segments for hard materials
• Body: steel core barrel for rigidity
• Use: compatible with standard core drilling machines and rigs (wet drilling recommended)

How to use

Secure the core drilling machine to a stable mount or rig and ensure correct alignment with the intended hole. Fit the Dedra HW4187 core bit to the arbor or chuck according to the machine manufacturer's instructions and check that the connection is tight. For best results use wet drilling to cool the diamond segments and suppress dust; maintain steady feed pressure and avoid excessive side loads that could damage segments. Withdraw the bit periodically to remove debris and allow water circulation, then complete the cut and extract the core plug.

Recommendations

Use water for cooling during drilling to extend the life of the diamond segments and reduce dust. Match rotational speed and feed rate to the machine and material hardness—medium to low feed pressure for reinforced concrete, smoother feed for brick. Inspect the bit regularly for segment wear and replace if segments are significantly worn or if the barrel shows deformation. Use appropriate personal protective equipment such as eye protection, hearing protection, and respiratory protection when dry drilling or in poorly ventilated areas.