A 250mm hollow core drill extension with 1/2" BSP thread, designed to increase drilling depth in dry core drilling applications.
• Extension function: Increases drilling depth reach
• Hollow design: Allows core removal access
• Extension length: 250mm reach
• Thread type: 1/2" BSP connection
• Application use: Dry core drilling systems
• Material type: Steel construction
OTEC 1/2 BSP 250mm Hollow Extension - Core Drill Extension For Dry Drilling
A 250mm hollow core drill extension with 1/2" BSP thread, designed to increase drilling depth in dry core drilling applications.
• Extension function: Increases drilling depth reach
• Hollow design: Allows core removal access
• Extension length: 250mm reach
• Thread type: 1/2" BSP connection
• Application use: Dry core drilling systems
• Material type: Steel construction
- Buy 5 for £17.88 £14.90 each and save 8%
- Buy 10 for £16.78 £13.98 each and save 14%
| BULK DISCOUNT | 5 | 10 |
|---|---|---|
| Price | £14.90 £17.88 | £13.98 £16.78 |
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Log in to access trade discountsOTEC 1/2 BSP 250mm Hollow Extension - Core Drill Extension For Dry Drilling
This 250mm hollow extension is designed to extend the reach of dry core drills, allowing deeper drilling in masonry applications. The hollow construction enables access for core removal tools, improving usability during drilling.
Built for trade use, it provides a secure connection between the drill adaptor and core drill, ensuring consistent performance in brick and blockwork.
Why Choose the OTEC 250mm hollow extension
• Extended drilling depth: Adds 250mm reach for deeper applications
• Hollow construction: Allows use of drift key for core removal
• 1/2" BSP thread: Compatible with standard dry core drill systems
• Secure connection: Maintains stability during extended drilling
• Durable steel build: Designed for repeated site use
• Essential extension tool: Supports deeper and more flexible drilling setups
What You Receive
• 1 x 250mm hollow extension
Specifications
| Specification | Detail |
|---|---|
| Product Name | OTEC 1/2 BSP 250mm Hollow Extension - Core Drill Extension For Dry Drilling |
| Product Code | AC-B25 |
| Length | 250 mm |
| Thread Type | 1/2" BSP |
| Design | Hollow extension |
| Application Type | Dry core drilling |
| Material | Steel |
| Compatibility | Core drills and adaptors |
| Use | Drill depth extension |
Compatibility
| Compatible With | Status |
|---|---|
| 1/2" BSP core drills | ✓ Compatible |
| Core drill adaptors | ✓ Compatible |
| Dry core drilling systems | ✓ Compatible |
| Brick | ✓ Compatible |
| Blockwork | ✓ Compatible |
| Wet drilling systems | ✗ Not recommended |
Who Is This For?
This extension is designed for trades carrying out dry core drilling in masonry where additional depth is required. It is suited to plumbers, electricians, and contractors working on deeper installations.
Typical Applications
• Extending reach for deep core drilling
• Pipe and duct installation through thick walls
• Electrical conduit drilling in masonry
• Plumbing installations requiring deeper access
• General construction drilling requiring extended depth
How to Use
-
Attach the extension to the drill adaptor
-
Connect the core drill to the extension
-
Ensure all threaded connections are secure
-
Begin drilling with steady pressure
-
Withdraw periodically to clear dust
-
Use drift key through hollow section if required
Safety and Maintenance
Safety during use:
Wear PPE including gloves eye protection and dust mask
Ensure all connections are secure before use
Avoid excessive force during extended drilling
Maintain control of the drill
After use and maintenance:
Clean threads after use
Remove dust and debris from hollow section
Inspect for wear or damage
Store in a dry environment
Frequently Asked Questions
Q: What is a hollow core drill extension used for?
A: It increases the drilling depth while allowing access through the centre for core removal tools.
Q: Why is the hollow design important?
A: It allows a drift key to pass through the extension to remove the drilled core.
Q: What thread does this extension use?
A: It uses a 1/2" BSP thread, standard for dry core drilling.
Q: How long is this extension?
A: It provides an additional 250mm of drilling reach.
Q: Is this suitable for dry core drilling?
A: Yes, it is designed specifically for dry drilling applications.
Q: What materials can it be used on?
A: It is used in brick and blockwork when paired with suitable core drills.
Q: Can this be used with any adaptor?
A: It is compatible with adaptors that use a 1/2" BSP connection.
Q: Does it affect drilling stability?
A: When correctly fitted, it maintains a secure and stable connection.
Q: Can I remove cores through this extension?
A: Yes, the hollow design allows drift keys to be used for core removal.
Q: Why buy core drilling accessories from CMT Group?
A: CMT Group supplies trade-grade accessories with reliable stock, expert support, and fast UK delivery including same and next working day options.
