Diamond Crown kroonboor Flex RM-TX 1 1/4 inch 250 mm x 450 mm, droog

The Diamond Crown core bit Flex RM-TX 1 1/4" 250 mm x 450 mm, dry is a segmented diamond core bit designed for dry core drilling with a 1 1/4" (RM-TX) thread connection. With a 250 mm outer diameter and a 450 mm overall length, this core bit is intended for cutting reinforced concrete, masonry and similar hard materials encountered in construction, renovation and sampling tasks. It is configured for use in applications that require a robust diamond cutting edge and compatibility with rotary drilling systems that accept the specified thread type.

Advantages

The segmented diamond rim provides efficient material removal and reduced heat buildup during dry drilling, improving cutting speed on dense substrates. The 1 1/4" thread connection ensures secure attachment to compatible drilling rigs and handheld core drills. A 450 mm length offers extended reach for deeper cores while the 250 mm diameter balances large hole capacity with manageable torque for most professional drilling equipment.

Suitable for

• Dry core drilling of reinforced concrete
• Drilling through brick, blockwork and masonry
• Sampling and taking concrete cores for testing
• Construction and renovation projects requiring large-diameter holes

Key specifications

• Outer diameter: 250 mm
• Overall length: 450 mm
• Connection type: 1 1/4" (RM-TX) male thread
• Cutting type: segmented diamond rim for dry use
• Intended materials: reinforced concrete, masonry and similar hard substrates

How to use

Mount the core bit firmly onto a drill or core rig that accepts a 1 1/4" RM-TX threaded connection, following the equipment manufacturer's tightening instructions. Position the drill perpendicular to the work surface and start at low speed to establish the cutting line, then increase to recommended operating speed for your machine while applying steady, even pressure. Since the bit is designed for dry drilling, allow intermittent pauses to avoid overheating: withdraw the core bit periodically to clear dust and cool the cutting segments. Use appropriate dust extraction or respiratory protection to control airborne particles during dry coring.

Recommendations

For best results, match drill speed and feed rate to the material hardness and machine capability, use tapered starts if available to reduce initial torque, and always wear protective equipment including eye, ear and respiratory protection. Consider using compatible water-feed variants or wet-drilling alternatives when dust suppression or extended tool life is required.