A 240mm hex chuck adaptor for diamond core drills. Connects your core drill bit to a standard hex chuck driver, making it a straightforward add-on for any tradesperson who needs to switch between drive systems quickly on site.
The 240mm diamond core hex chuck adaptor does one job and does it well: it bridges the gap between your diamond core drill bit and a hex chuck driver. If you’ve ever been on site with the right bit and the wrong drive setup, you’ll know how frustrating that is. This adaptor sorts it without any drama.
At 240mm in length, it gives you a bit of extra reach compared to shorter adaptors, which is useful when drilling through deeper sections of masonry, concrete block, or brickwork where a standard-length shank would leave you struggling for clearance. The hex shank design seats securely in compatible drill drivers and SDS-to-hex converters, keeping the core bit centred and reducing the chance of wobble during the cut.
Where the 240mm Diamond Core Hex Chuck Adaptor Earns Its Keep
Core drilling is one of those jobs where the setup matters as much as the drill itself. A poorly fitted adaptor introduces runout, which shortens the life of your core bit and makes for a rougher hole. This one keeps things aligned, which is exactly what you need when you’re cutting a clean aperture for a soil pipe, cable duct, or ventilation sleeve through a wall.
It’s a sensible addition to any diamond core accessory kit, particularly for tradespeople who use a range of drill platforms and need a reliable, consistent connection between their hex chuck drills and core bits. Electricians, plumbers, and general builders who regularly core through masonry will find it earns its place in the bag fairly quickly.
The 240mm length also works well in confined spaces where a right-angle or offset approach is needed, giving you enough shank length to keep control of the drill without the chuck fouling on surrounding surfaces. Not glamorous, but genuinely useful. Like most of the best tools on site, it just gets on with the job.
Pro Tip: When using a hex chuck adaptor for core drilling, make sure the hex shank is fully seated and locked before you start, as even slight play in the connection will cause the core bit to wander and oval out the hole.
This adaptor is used wherever a diamond core bit needs to be driven from a hex chuck drill or driver. Common applications include cutting holes through brick, concrete block, and dense aggregate masonry for soil pipes, conduit, ventilation ducts, and cable runs. Plumbers, electricians, and builders all reach for this kind of adaptor regularly. The 240mm length suits deeper wall sections and situations where extra reach between the chuck and the cutting face is needed to maintain clean, controlled drilling.
Best For
Connecting diamond core bits to hex chuck drills
Drilling through brick, block and concrete
Cable and conduit routing holes
Soil pipe and ventilation apertures
Jobs requiring extra reach between chuck and core bit
Works With
Hex chuck drill drivers
SDS-to-hex chuck converters
Standard diamond core drill bits with compatible thread
Wet and dry core drilling setups
Key Specifications
Length: 240mm
Drive type: HEX shank
Application: Diamond core drilling
Product type: Core drill chuck adaptor
Not suitable for: Not suitable for use with SDS-plus or SDS-max drive systems without an additional converter. Not designed for rotary percussion use with standard masonry bits.
Fit the hex shank into your drill chuck and tighten it fully before attaching the core bit to the adaptor's thread. Check that both connections are secure before applying power. Always run the core bit at the correct speed for the material and diameter being cut, and use a pilot drill or guide to keep the bit on position at the start of the hole.
Check the thread on the adaptor is compatible with your core bit before starting
Insert the hex shank fully into the drill chuck and lock it securely
Thread the diamond core bit onto the adaptor and tighten until firm
Use a centre punch or pilot drill to mark the hole position accurately
Set the drill to the correct speed for the core bit diameter and material
Apply steady, even pressure and let the core bit do the cutting without forcing it
What size core bits does this adaptor work with?
The adaptor is compatible with diamond core bits that match its thread specification. Check the thread size against your core bits before ordering. Most standard wet core bits use a common thread size, but it is worth confirming compatibility, particularly with specialist or import bits.
Can I use this adaptor with a standard combi drill?
Yes, provided your combi drill has a hex chuck or can accept a hex shank. Most 13mm keyless chucks will grip a hex shank securely. That said, for larger diameter core bits, a dedicated core drill or powerful SDS machine with a hex converter will give you better control and a longer bit life.
Why 240mm rather than a shorter adaptor?
The extra length is useful when drilling through thicker wall sections or when you need clearance between the drill body and the wall face. It also helps in situations where the chuck would otherwise foul on surrounding surfaces. For standard single-skin brick or block walls, a shorter adaptor would work fine, but the 240mm gives you more flexibility across different job conditions.
The 240mm hex chuck adaptor is machined to provide a rigid, centred connection between a hex drive chuck and a diamond core bit. The hex shank provides positive engagement in the chuck, reducing slip and runout during cutting. The 240mm overall length extends the effective reach of the drill, suitable for use in wet or dry core drilling applications across masonry and concrete substrates.
Length
240mm
Drive Type
HEX shank
Application
Diamond core drilling
Product Type
Chuck adaptor
SKU
DCAH240P
Product Type
Diamond Core Adaptors
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