Diamond Core Hex Barrel Extension Rod 200mm

Name: 200mm Diamond Core Hex Extension Rod | Dirt Cheap Trade Rates
SKU: Hex-Barrel
Price: 7.90 GBP
Availability: InStock

SKU: Hex-Barrel Category: Diamond Core Accessories Tag: content-updated

£7.90£9.48 EX VATINC VAT

A 200mm hex barrel extension rod for diamond core drilling rigs. Extends your core drill setup to reach deeper into blockwork, concrete and masonry without repositioning the rig. Solid, straightforward, and does exactly what it says.

Credit Plans Available

Description

When your diamond core bit won’t quite reach and repositioning the rig isn’t an option, a 200mm diamond core hex extension rod is what you’re after. Used across plumbing, electrical, and general construction work wherever a through-wall or deep-core hole is needed, this extension rod threads between your drill and bit to give you that extra reach without losing torque or concentricity. Simple solution to a surprisingly common problem on site.

The hex barrel design is the standard format for most core drill rigs on the market. It gives a positive, secure connection at both ends, and because the geometry is consistent across the hex barrel system, you’re not fighting flex or wobble mid-cut. Keeping the core straight through a 215mm cavity wall or a dense concrete block is exactly where this pays for itself.

Where the 200mm Hex Barrel Extension Rod Earns Its Place

Most commonly you’ll find this in use behind the drill body, either stacking with another extension or bridging the gap between a short pilot and a deep substrate. Plumbers cutting soil pipe penetrations through thick walls, sparkies chasing a core through a double-skin, groundworkers boring through a concrete base: all situations where the bit alone doesn’t get the job done. The 200mm length hits a useful middle ground, long enough to matter, short enough to stay manageable. If you need more, two extensions can usually be run in series, though the longer your stack the more important it is to support the rig properly.

At this price point, keeping a couple in the van makes sense. They’re small, they’re light, and the one time you need one and don’t have it, you’ll remember. The hex barrel format is compatible with the vast majority of trade core drill machines, so there’s a reasonable chance it’ll slot straight onto whatever you’re already running.

Pro Tip: When running extension rods in series, check that every connection is fully tightened before you start the cut — a half-engaged thread will spin loose under load and can score the inside of the core barrel.

Applications

This extension rod is used wherever a standard core drill setup falls short of the required depth. Common applications include cutting penetrations through thick masonry walls, double-skin blockwork, reinforced concrete floors and deep beam sections. It's regularly used by plumbers installing soil and waste pipework, electricians forming cable entries, HVAC engineers coring for duct penetrations, and groundworkers boring through concrete slabs and bases. Anywhere the drill body sits proud of the surface and the bit needs extra reach, this is the fix.

Best For

Deep penetrations through thick masonry
Double-skin and cavity wall coring
Reinforced concrete floors and slabs
Extending reach without rig repositioning
Stacking with a second extension for greater depth

Works With

Standard hex barrel diamond core drill rigs
Most trade core drill machines with hex drive
Diamond core bits with hex barrel shank
Other hex barrel extension rods for stacking

Key Specifications

Length: 200mm
Connection type: Hex barrel
Supplied as single unit
Compatible with standard trade core drill systems

Not suitable for: Not suitable for SDS or spline drive core drill systems — this is a hex barrel fitting only. Check your drill and bit connection type before ordering.

Usage

Thread the extension rod between the core drill body and the diamond core bit, ensuring both connections are fully hand-tight before applying the wrench. Never start a cut with a loose joint. Keep the rig supported and level throughout the cut, particularly when the extension places the bit further from the guide point.

If stacking two extensions, tighten each joint independently and give both a final check before you start. Water feed should still reach the bit face as normal, but check the flow is getting through the full extended length before committing to the cut.

Ensure the core drill rig is switched off and fully stopped before fitting the extension
Thread the extension rod onto the drill spindle or existing rod and tighten securely
Attach the diamond core bit to the free end of the extension and tighten fully
Check all connections are firm, no play or looseness at either joint
Set up the rig guide as normal, accounting for the additional length when positioning
Confirm water feed is running through to the bit face before starting the cut
Begin the core at low speed to establish the groove, then increase to working speed
Monitor the cut for vibration, which can indicate a connection working loose

FAQs

Will this fit my core drill machine?

If your machine uses a hex barrel drive system, yes. The hex barrel format covers the majority of trade core drill rigs. If you're unsure, check the connection on your existing core bit — if it's a hex barrel shank, this extension will be compatible.

Can I use two of these together to get 400mm of extension?

Yes, hex barrel extensions can generally be stacked. Two 200mm rods gives you 400mm of additional reach. When doing this, make sure both joints are fully tightened, support the drill rig properly, and keep your speed and feed rate consistent to avoid flex-induced wander.

Does the water feed still work with the extension fitted?

Yes. The hex barrel extension rod passes the water feed through to the bit face in the same way as the standard drill setup. Before you start cutting, check the water is flowing freely through the full length, particularly if you're running two extensions in series.

Technical Information

The hex barrel extension rod is machined to the standard hex barrel format used across trade core drilling systems. The connection geometry maintains alignment between the drill spindle and bit, keeping the core path true through the substrate. At 200mm, it provides a practical extension length for most through-wall and deep-floor applications without introducing significant flex into the assembly.