MAXTEC SDS Plus Tapcon drill bit in 5.15mm diameter with U-flute design and heavy duty carbide tip, available in 210mm and 310mm lengths for drilling precise pilot holes for Tapcon concrete screws.
- U-flute design: wider and deeper channel removes debris faster for cleaner holes and longer bit life
- Heavy duty carbide tip: cuts concrete, masonry, and stone without rapid blunting
- 5.15mm diameter: the precise pilot hole size required for Tapcon 1/4" concrete screws
- SDS Plus shank: fits all SDS Plus rotary hammer drills without adapters
- Two lengths available: 210mm for standard depth, 310mm for deeper embedment requirements
- Working lengths: 142mm (210mm bit) and 240mm (310mm bit)
MAXTEC SDS Plus Tapcon Drill Bit - U-Flute - 5.15mm
MAXTEC SDS Plus Tapcon drill bit in 5.15mm diameter with U-flute design and heavy duty carbide tip, available in 210mm and 310mm lengths for drilling precise pilot holes for Tapcon concrete screws.
- U-flute design: wider and deeper channel removes debris faster for cleaner holes and longer bit life
- Heavy duty carbide tip: cuts concrete, masonry, and stone without rapid blunting
- 5.15mm diameter: the precise pilot hole size required for Tapcon 1/4" concrete screws
- SDS Plus shank: fits all SDS Plus rotary hammer drills without adapters
- Two lengths available: 210mm for standard depth, 310mm for deeper embedment requirements
- Working lengths: 142mm (210mm bit) and 240mm (310mm bit)
MAXTEC SDS Plus Tapcon drill bit
Tapcon concrete screws require a precisely sized pilot hole to cut a clean thread and achieve their rated load capacity. The correct diameter for a standard 1/4" Tapcon screw is 5.15mm: not 5mm, not 6mm. Using the wrong diameter produces a hole that is either too tight for the screw to drive or too loose for the thread to grip, both of which compromise the fixing. The MAXTEC SDS Plus Tapcon drill bit is manufactured to this exact 5.15mm diameter, with a U-flute design that evacuates concrete dust efficiently and a heavy duty carbide tip that maintains cutting accuracy through the volume of holes a typical Tapcon installation requires.
Why choose the MAXTEC SDS Plus Tapcon drill bit
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Precision 5.15mm diameter: This is the exact pilot hole size specified for Tapcon 1/4" concrete screws. A hole that is even fractionally oversize reduces the thread engagement and load capacity of the screw. The MAXTEC bit is manufactured to this precise diameter to ensure every hole meets the Tapcon installation specification.
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U-flute debris removal: The wide, deep U-shaped flute channel removes concrete dust from the hole significantly faster than a standard flute. A cleaner hole means the Tapcon screw cuts a sharper, fuller thread in the concrete, which directly improves holding strength. It also reduces heat at the carbide tip and extends bit life on high-volume installations.
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Heavy duty carbide tip: The carbide tip is specified for the repeated impact loads of SDS Plus hammer drilling in concrete and masonry. It maintains cutting accuracy across the working life of the bit, ensuring hole diameter stays within tolerance throughout the installation run.
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SDS Plus shank: Fits every SDS Plus rotary hammer drill on the market without adapters. The SDS Plus locking mechanism transmits full percussion energy into the carbide tip, which is why SDS Plus is the correct tool for Tapcon pilot hole drilling rather than a standard percussion drill.
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Two lengths for different embedment depths: The 210mm overall length with 142mm working length covers standard Tapcon installations. The 310mm with 240mm working length is for deeper embedment or for reaching through thicker materials before the screw enters the concrete substrate.
What's included
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1 x MAXTEC SDS Plus Tapcon drill bit in 5.15mm diameter
Specifications
| Specification | Detail |
|---|---|
| Product Name | MAXTEC SDS Plus Tapcon Drill Bit - U-Flute - 5.15mm |
| Product Code | SDSP-5.15 |
| Brand | MAXTEC |
| Shank Type | SDS Plus |
| Diameter | 5.15mm |
| Tip Type | Heavy Duty Carbide |
| Flute Design | U-Flute for Rapid Debris Removal |
| Compatible Screw | Tapcon 1/4" (6.3mm) Concrete Screws |
| Available Lengths | 210mm and 310mm Overall Length |
| Working Length - 210mm bit | 142mm |
| Working Length - 310mm bit | 240mm |
| For Use With | All SDS Plus Rotary Hammer Drills |
| Material Compatibility | Concrete, Masonry, Natural Stone, Brick, Block |
Compatibility
| Compatible with | Status |
|---|---|
| All SDS Plus rotary hammer drills (all brands) | ✓ Compatible |
| Tapcon 1/4" (6.3mm) concrete screws - pilot hole drilling | ✓ Compatible |
| Concrete, brick, block, and natural stone | ✓ Compatible |
| SDS Max drills (direct fit) | ✗ Not recommended |
| Standard percussion drills with keyless or keyed chuck | ✗ Not recommended |
| Tapcon 3/16" concrete screws (require 3.2mm bit, not 5.15mm) | ✗ Not recommended |
Available sizes
| Product Code | Diameter (mm) | Working Length (mm) | Overall Length (mm) |
|---|---|---|---|
| SDSP-5.15/210 | 5.15 | 142 | 210 |
| SDSP-5.15/310 | 5.15 | 240 | 310 |
Who is this for?
Fixings installers, structural contractors, electricians, and mechanical engineers who regularly install Tapcon 1/4" concrete screws into concrete, brick, and block. This bit is for any operative who needs a consistently clean, correctly sized pilot hole to ensure the Tapcon screw achieves its specified pull-out and shear load.
Typical applications
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Pilot holes for Tapcon 1/4" concrete screws in concrete slabs, walls, and columns
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Anchor points for conduit clips, cable trays, and electrical back boxes fixed to concrete
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Bracket and frame fixings into brick and block using Tapcon screws
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Mechanical service fixings into concrete structures on commercial and industrial projects
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Stud and track fixings for partition systems where Tapcon screws are specified into concrete floors or walls
How to use
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Check the Tapcon screw packaging to confirm the required pilot hole diameter is 5.15mm. Different Tapcon sizes require different pilot hole diameters.
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Insert the SDS Plus shank into your hammer drill chuck until it clicks and locks.
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Mark the drilling position and set the drill to hammer mode.
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Drill to the required depth. The embedment depth must be at least 25mm into the concrete beyond any fixture thickness.
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Blow dust from the hole before driving the Tapcon screw. The U-flute clears most debris during drilling but a quick blow-out ensures a clean thread engagement.
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Drive the Tapcon screw to the specified torque. Do not overtorque: Tapcon screws can strip the concrete thread if driven beyond specification.
Safety
Wear safety glasses and an FFP2 dust mask throughout. Concrete drilling produces respirable crystalline silica dust which is controlled under UK COSHH regulations. Check for embedded reinforcement, conduit, and services before drilling into any concrete element. Secure all fixtures before drilling to prevent movement under drill torque.
Maintenance
Inspect the carbide tip after heavy use. A worn tip will produce oversize or rough holes that weaken the Tapcon thread engagement. Replace any bit showing tip wear immediately: the cost of a replacement bit is negligible compared to a poorly performing Tapcon installation. Clear the U-flute with a stiff brush after use and store the bit with tip protection.
Frequently Asked Questions
Q: Why is the diameter 5.15mm and not 5mm or 5.5mm?
A: 5.15mm is the precise pilot hole diameter specified by Tapcon for their 1/4" (6.3mm) concrete screw. This specific diameter allows the screw thread to cut cleanly into the concrete without the hole being too tight (which causes over-torquing) or too loose (which reduces thread engagement and pull-out strength). Using a standard 5mm or 5.5mm bit does not meet the Tapcon installation specification.
Q: What is a Tapcon concrete screw and why does it need a specific pilot hole?
A: A Tapcon concrete screw is a self-tapping masonry fixing that cuts its own thread directly into concrete, brick, or block as it is driven. Unlike a traditional anchor that expands inside the hole, a Tapcon relies on the thread it cuts in the concrete for its holding strength. The pilot hole diameter must be exact: too small and the screw cannot be driven, too large and the thread has nothing to grip.
Q: What does the U-flute design do that a standard flute does not?
A: The U-flute is wider and deeper than a standard flute, which removes concrete dust from the hole faster during drilling. A cleaner hole means the Tapcon screw cuts a sharper, fuller thread in the concrete, improving holding strength. It also reduces heat at the carbide tip and extends bit life on high-volume installations.
Q: Which length do I need, 210mm or 310mm?
A: Choose based on your required embedment depth plus any fixture thickness. Tapcon screws require a minimum embedment of 25mm into the concrete. If you are fixing through a thick baseplate, bracket, or frame, add that thickness to the required embedment and select the length that gives you sufficient working length. The 210mm bit has 142mm working length. The 310mm bit has 240mm working length.
Q: Can I use this bit with a standard percussion drill instead of an SDS Plus machine?
A: No. The SDS Plus shank is designed for SDS Plus rotary hammer drills only. It cannot be fitted into a standard keyless or keyed chuck. For Tapcon installations, an SDS Plus hammer drill is the recommended tool as the percussion action is significantly more efficient at drilling concrete than a standard combi drill.
Q: Do I need to clean the hole before driving the Tapcon screw?
A: Yes. Even with the U-flute removing most debris during drilling, a quick blow-out of the hole before driving the screw ensures the thread cuts cleanly into undisturbed concrete. Compressed air or a blow-out pump takes seconds and directly improves the performance and reliability of the installation.
Q: Where can I order this bit and what are the delivery options?
A: Both length variants of the MAXTEC SDS Plus Tapcon drill bit are available at cmt.co.uk. CMT Group operates a fleet of over 100 vehicles covering 90% of the UK mainland with next working day delivery on orders placed by 7pm online. Trade accounts and EDGE portal ordering are available for procurement teams.
