Core Drill Bit Diam S3 200/450 mm [1 1/4 inch] – Diam

The Diam S3 core drill bit 200/450 mm with a 1 1/4" connection is a coronation-style bit engineered for large-diameter core drilling in masonry and concrete. It is compatible with core drilling rigs that accept a 1 1/4" spindle and is intended for both wet and dry drilling methods depending on the rig and site conditions. The bit’s dimensions (200 mm cutting diameter with a 450 mm overall length) provide the reach and cutting area required for creating holes for pipes, ducts and service penetrations in walls, floors and slabs.

Advantages

The Diam S3 design combines a reinforced core body with a segmented cutting crown to provide consistent cutting performance and controlled chip removal. Its construction is suitable for use on reinforced and unreinforced concrete and common masonry materials. The 1 1/4" connection provides secure mounting to compatible drill rigs, ensuring stability during high-torque operations. The bit can be used in wet drilling to reduce dust and increase cutting life or in dry drilling where site constraints require it, with appropriate cooling and dust control measures.

Suitable for

• Drilling large-diameter openings for pipes and conduits
• Creating service penetrations in concrete walls and floors
• Installing HVAC ducts and electrical chases
• Core sampling and removal for repair or inspection work

Key specifications

• Cutting diameter: 200 mm
• Overall length: 450 mm
• Connection/thread size: 1 1/4 inch
• Compatible materials: concrete, reinforced concrete, brick and common masonry
• Drilling methods: wet and dry (depending on rig and site setup)

How to use

Mount the Diam S3 core drill bit to a compatible core drilling rig with a 1 1/4" spindle and secure according to the rig manufacturer’s instructions. Position the drill to the marked drilling location and use appropriate pilot guidance or template to maintain alignment. For wet drilling, supply water to the cutting area to reduce dust and cool the bit; for dry drilling, use recommended dust extraction and intermittent cutting to prevent overheating. Apply steady feed pressure and let the bit cut at its own pace to avoid excessive vibration or binding. After reaching the required depth, withdraw the bit while the rig is still running briefly to clear the core and flush debris if applicable.

Usage recommendations

Use appropriate personal protective equipment, dust extraction or water suppression, and follow the drill rig manufacturer’s limits for speed and feed. Inspect the cutting crown and core body before use and replace the bit when segments show significant wear or damage to maintain safe and efficient drilling performance.