Diamond Core Bit 1 1/4" (32 mm) 122/430 mm for Core Drills — Delphi Tools

Delphi Tools Diamond Core Bit 1 1/4" (32 mm) 122/430 mm is a segmented diamond core bit designed for use with compatible rotary core drilling machines. It is intended for cutting precise circular holes in masonry, reinforced concrete, brick and other mineral substrates. The product combines a 1 1/4" nominal connection with a 122 mm cutting length and 430 mm overall length, enabling core extraction and through-drilling in medium-depth applications when used with appropriate drill setups and cooling.

Advantages

The segmented diamond segments provide efficient material removal and reduced clogging during drilling. The standard 1 1/4" connection ensures compatibility with a wide range of core drilling arbors and machines. The 122/430 mm dimensions offer a balance between cutting depth and overall reach, making it suitable for both stand-mounted and hand-guided drilling when proper fixtures are used. When cooled and operated at recommended speeds, the bit offers extended cutting life and consistent roundness of holes.

Suitable for

• Drilling circular openings in masonry and concrete for plumbing and electrical installations
• Core sampling and removal in renovation and retrofit projects
• Through-drilling for anchor installation or pipe passage
• Use on stand-mounted or handheld core drilling machines with compatible arbor

Key specifications

• Connection: nominal 1 1/4" (approx. 32 mm)
• Cutting length: 122 mm
• Overall length: 430 mm
• Tip type: segmented diamond cutting edge for faster removal and cooling
• Target materials: masonry, concrete, brick and similar mineral substrates

How to use

Mount the core bit on a compatible core drill arbor with the correct 1 1/4" connection and secure according to the drill manufacturer's instructions. Use a steady feed and appropriate rotational speed for the target material; begin drilling with moderate pressure to establish the pilot path, then maintain continuous cutting action. Apply water cooling or the recommended cooling method to control heat and remove debris; intermittent drilling may be used for deep holes to assist flushing of cut material. After cutting, stop the drill before removing the bit and extract the core if required.

Usage recommendations

For best performance and tool life, use continuous water cooling when drilling concrete or reinforced concrete, choose rotational speed and feed pressure suitable for the bit diameter and material hardness, and inspect the cutting segments regularly. Avoid excessive side loads and overheating to prevent premature wear. Use appropriate PPE and follow machine safety guidelines.