MAXTEC SDS Plus 4-cutter masonry drill bits for reinforced concrete, natural stone, and masonry. Available from 5mm to 24mm diameter for all SDS Plus rotary hammer drills.
- Solid 4-cutter carbide head: rebar-safe tip geometry resists snagging and reduces tip breakage under heavy load
- Twin-spiral flute design: faster dust removal, reduced heat build-up, and longer bit life than standard flute patterns
- Integrated dust extraction grooves: evacuates fine dust during deep drilling for cleaner holes and better operator visibility
- Symmetrical tip geometry: ensures precise hole shape critical for anchor fixing compliance
- Diameter range: 5mm to 24mm across multiple length variants
- Length range: 160mm to 460mm for standard through to deep anchor drilling
- PGM certified: verified to German Prüfgemeinschaft Mauerbohrer standards for safety-critical fixings
MAXTEC SDS Plus 4-Cutter Masonry Drill Bit - 5mm to 24mm Range
MAXTEC SDS Plus 4-cutter masonry drill bits for reinforced concrete, natural stone, and masonry. Available from 5mm to 24mm diameter for all SDS Plus rotary hammer drills.
- Solid 4-cutter carbide head: rebar-safe tip geometry resists snagging and reduces tip breakage under heavy load
- Twin-spiral flute design: faster dust removal, reduced heat build-up, and longer bit life than standard flute patterns
- Integrated dust extraction grooves: evacuates fine dust during deep drilling for cleaner holes and better operator visibility
- Symmetrical tip geometry: ensures precise hole shape critical for anchor fixing compliance
- Diameter range: 5mm to 24mm across multiple length variants
- Length range: 160mm to 460mm for standard through to deep anchor drilling
- PGM certified: verified to German Prüfgemeinschaft Mauerbohrer standards for safety-critical fixings
MAXTEC SDS Plus 4-cutter masonry drill bit
The MAXTEC SDS Plus 4-cutter range sits above the 2-cutter range in both performance and application scope. Four carbide cutting edges rather than two means higher penetration rates, more efficient debris removal, and a tip geometry engineered to handle contact with embedded rebar without snagging or tip fracture. For professionals drilling at volume into reinforced concrete, or working on structural and infrastructure projects where hole accuracy and anchor compliance are non-negotiable, this is the correct specification. PGM certification verifies every bit in the range against the German standard for drill hole accuracy, giving engineers and fixings specialists the independent assurance their specifications require.
Why choose the MAXTEC SDS Plus 4-cutter masonry drill bit
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Solid 4-cutter carbide head: Four cutting edges distribute the percussion impact across a larger tip contact area, reducing the peak stress on any single edge. The symmetrical geometry means the hole stays round and on diameter even when the bit grazes reinforcement, which is the failure mode that causes 2-cutter bits to produce oversize or irregular holes in reinforced concrete.
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Rebar-safe tip geometry: The 4-cutter head is specifically engineered to deflect and continue cutting rather than snag when it contacts rebar. Snagging causes sudden tip fracture and in extreme cases bit ejection, both of which are eliminated by the symmetrical 4-cutter design. This is the specification that makes the MAXTEC 4-cutter the correct choice for any reinforced concrete application.
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Twin-spiral flute with integrated dust extraction grooves: The combination of twin-spiral flutes and dedicated extraction grooves removes fine concrete dust from the hole significantly faster than a standard single-flute or U-flute design. Faster dust removal reduces friction and heat at the tip, directly extending carbide life, and keeps the hole clear for better operator control on deep drilling tasks.
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Symmetrical tip geometry for anchor compliance: Chemical and mechanical anchors are load-rated to a specified hole diameter and tolerance. A symmetrical 4-cutter tip produces a consistently round hole at the specified diameter, which is what PGM certification verifies. An asymmetric or worn tip produces oval or oversize holes that reduce anchor load capacity.
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PGM certified: Every bit in the MAXTEC 4-cutter range is manufactured to meet the Prüfgemeinschaft Mauerbohrer standard, an independent German certification that verifies drill hole accuracy. On safety-critical structural anchor installations, this certification is often required by the engineer of record and the anchor manufacturer's technical approval.
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SDS Plus shank: Compatible with every SDS Plus rotary hammer drill on the market. Secure bit retention and efficient percussion transfer are maintained across the full diameter and length range without adapters or modifications.
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Full diameter and length coverage: 5mm through to 24mm across lengths from 160mm to 460mm, covering light installation work through to deep anchor drilling in structural concrete.
What's included
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1 x MAXTEC SDS Plus 4-cutter masonry drill bit in your selected diameter and length
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Available in diameters from 5mm to 24mm and lengths from 160mm to 460mm
Specifications
| Specification | Detail |
|---|---|
| Product Name | MAXTEC SDS Plus 4-Cutter Masonry Drill Bit - 5mm to 24mm Range |
| Product Code | SDSP4 |
| Brand | MAXTEC |
| Shank Type | SDS Plus |
| Tip Type | Solid 4-Cutter Carbide Head |
| Cutting Edges | 4-Cutter |
| Tip Geometry | Symmetrical, Rebar-Safe |
| Flute Design | Twin-Spiral with Integrated Dust Extraction Grooves |
| Diameter Range | 5mm to 24mm |
| Length Range | 160mm to 460mm |
| For Use With | All SDS Plus Rotary Hammer Drills |
| Material Compatibility | Reinforced Concrete, Concrete, Natural Stone, Brick, Block, Masonry |
| Certification | PGM Certified (Prüfgemeinschaft Mauerbohrer) |
| Standard | SDS Plus (ISO 5468) |
Compatibility
| Compatible with | Status |
|---|---|
| All SDS Plus rotary hammer drills (all brands) | ✓ Compatible |
| Hilti, Bosch, Makita, DeWalt, Milwaukee SDS Plus machines | ✓ Compatible |
| Reinforced concrete, concrete, natural stone, brick, block | ✓ Compatible |
| Mechanical and chemical anchor hole drilling | ✓ Compatible |
| SDS Max drills (direct fit) | ✗ Not recommended |
| Standard percussion drills with keyless or keyed chuck | ✗ Not recommended |
| Cordless drills without SDS Plus chuck | ✗ Not recommended |
Available sizes
| Product Code | Diameter (mm) | Working Length (mm) | Overall Length (mm) |
|---|---|---|---|
| SDSP-5/160P | 5.0 | 93 | 160 |
| SDSP-6/160P | 6.0 | 93 | 160 |
| SDSP-6/210P | 6.0 | 143 | 210 |
| SDSP-6/260P | 6.0 | 193 | 260 |
| SDSP-7/160P | 7.0 | 93 | 160 |
| SDSP-7/210P | 7.0 | 143 | 210 |
| SDSP-8/160P | 8.0 | 93 | 160 |
| SDSP-8/210P | 8.0 | 143 | 210 |
| SDSP-8/260P | 8.0 | 193 | 260 |
| SDSP-8/310P | 8.0 | 243 | 310 |
| SDSP-10/160P | 10.0 | 93 | 160 |
| SDSP-10/210P | 10.0 | 143 | 210 |
| SDSP-10/260P | 10.0 | 193 | 260 |
| SDSP-10/310P | 10.0 | 243 | 310 |
| SDSP-12/160P | 12.0 | 80 | 160 |
| SDSP-12/210P | 12.0 | 130 | 210 |
| SDSP-12/260P | 12.0 | 180 | 260 |
| SDSP-12/310P | 12.0 | 230 | 310 |
| SDSP-14/210P | 14.0 | 128 | 210 |
| SDSP-14/260P | 14.0 | 173 | 260 |
| SDSP-14/460P | 14.0 | 378 | 460 |
| SDSP-16/210P | 16.0 | 127 | 210 |
| SDSP-16/310P | 16.0 | 227 | 310 |
| SDSP-18/260P | 18.0 | 176 | 260 |
| SDSP-18/310P | 18.0 | 226 | 310 |
| SDSP-18/460P | 18.0 | 376 | 460 |
| SDSP-20/460P | 20.0 | 375 | 460 |
| SDSP-22/460P | 22.0 | 374 | 460 |
| SDSP-24/460P | 24.0 | 374 | 460 |
Who is this for?
The MAXTEC SDS Plus 4-cutter masonry drill bit range is for structural fixings specialists, civil engineers, infrastructure contractors, and experienced site operatives who require the highest level of hole accuracy and bit reliability in reinforced concrete. It is the correct choice for any application where PGM-certified hole dimensions are specified by the engineer of record, where rebar contact is a realistic risk, or where drilling volume in hard substrates makes bit longevity a significant operational cost.
Typical applications
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Safety-critical chemical anchor installations requiring PGM-certified hole accuracy in reinforced concrete beams and slabs
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Mechanical anchor and throughbolt installations in structural concrete where hole geometry determines anchor load compliance
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Fixings and clearance holes in reinforced concrete structures where rebar contact is anticipated
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High-volume production drilling in concrete where penetration rate and bit life directly affect programme cost
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Infrastructure and rail projects where independent certification of hole accuracy is required by the specification
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Deep anchor drilling up to 460mm in dense concrete, engineering brick, and hard natural stone
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Heavy duty masonry installations where standard 2-cutter bits have proven insufficient in service life or hole quality
How to use
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Select the correct diameter and length. Always refer to the anchor manufacturer's technical data sheet for the specified hole diameter, embedment depth, and hole tolerance. Do not substitute a different diameter or round up to the nearest available size.
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Insert the SDS Plus shank into the hammer drill chuck until it clicks and locks. The axial play in the shank is correct for SDS Plus operation.
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Set the drill to hammer drilling mode for all concrete, reinforced concrete, and hard masonry applications.
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Mark and centre the drilling position clearly. Use a punch or pilot drill to establish the centre on dense or smooth concrete surfaces before going to full diameter.
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Apply steady, controlled forward pressure. The 4-cutter geometry works most effectively with consistent pressure: backing off or surging increases tip wear and produces less round holes.
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Withdraw periodically to clear the flute. The integrated dust extraction grooves handle most debris, but deep holes beyond 200mm benefit from periodic withdrawal every 50 to 80mm of depth to maintain penetration rate.
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After drilling, clean the hole with a blow-out pump and wire brush before installing any anchor or fixing.
Safety
Wear safety glasses and hearing protection during all SDS Plus drilling. An FFP2 or FFP3 dust mask is required for concrete and masonry drilling under UK COSHH regulations: respirable crystalline silica generated during SDS Plus hammer drilling is a category 1 carcinogen. Always scan for embedded reinforcement, conduit, and services before drilling into any concrete element. On infrastructure and rail projects, comply with site-specific permits to dig and drilling control procedures before commencing any core drilling activity.
Maintenance
Inspect all four carbide cutting edges after each session. On a worn 4-cutter bit, the edges show rounding or chipping visible under close inspection. A bit producing oversize holes, slower penetration, or increased vibration should be replaced immediately. For structural anchor applications, a worn bit that produces an out-of-tolerance hole may require the installation to be redesigned or relocated, at significant programme and cost impact. Clear the twin-spiral flute and extraction grooves with a stiff brush after each use. Store bits with tip protection to prevent carbide chipping during transit and storage.
Frequently Asked Questions
Q: What is the practical difference between the 2-cutter and 4-cutter MAXTEC ranges?
A: The 4-cutter has four carbide cutting edges versus two, which delivers higher penetration rates, better debris removal through the twin-spiral flute, and a symmetrical tip geometry that handles rebar contact without snagging. The 2-cutter is the correct specification for most standard construction and infrastructure drilling. The 4-cutter is the step up for high-volume reinforced concrete drilling, safety-critical anchor installations, and applications where rebar contact is anticipated.
Q: What does PGM certified mean for a drill bit?
A: PGM stands for Prüfgemeinschaft Mauerbohrer, an independent German certification body that tests masonry drill bits for dimensional accuracy. A PGM certified bit is verified to drill holes within the tolerance specified for anchor installations. This matters on safety-critical fixings because an oversize hole, even by a fraction of a millimetre, reduces the anchor's rated load capacity and may render the installation non-compliant with the design specification.
Q: Why is rebar-safe tip geometry important?
A: When an SDS Plus bit contacts embedded reinforcement, an asymmetric tip can snag on the bar, causing sudden lateral force that fractures the carbide tip or in severe cases ejects the bit from the hole. The symmetrical 4-cutter geometry distributes contact forces evenly across all four edges, allowing the bit to deflect past the rebar without snagging. This protects both the bit and the operator.
Q: What do the integrated dust extraction grooves do that a standard flute does not?
A: The twin-spiral flute handles the bulk of concrete debris removal. The dedicated extraction grooves are machined to evacuate the fine dust that the main flute leaves behind, particularly on deep holes where fine particles accumulate and form a compacted plug that increases friction and heat. Removing this fine dust keeps the cutting zone clear, reduces tip temperature, and maintains penetration rate on holes beyond 200mm depth.
Q: Can I use the 4-cutter bits for chemical anchor installations?
A: Yes. The PGM certification and symmetrical tip geometry make the MAXTEC 4-cutter the correct choice for chemical anchor installations where hole diameter accuracy is specified. After drilling, clean the hole fully with a blow-out pump and wire brush before injecting resin, following the anchor manufacturer's specific hole preparation procedure.
Q: Is the MAXTEC 4-cutter compatible with all SDS Plus machines?
A: Yes. The SDS Plus shank is a standardised format and fits every SDS Plus rotary hammer drill without adapters, including Hilti, Bosch, Makita, DeWalt, Milwaukee, and all other mainstream brands. These bits are not compatible with SDS Max machines, which use a larger shank format.
Q: When should I replace a 4-cutter bit rather than continuing to use it?
A: Replace the bit when any of the four cutting edges show visible chipping or rounding, when penetration rate drops noticeably, when hole diameter is measuring oversize, or when vibration increases beyond normal levels. On safety-critical anchor applications, any bit producing an out-of-tolerance hole must be replaced immediately and the affected hole assessed before anchor installation proceeds.
Q: Where can I order MAXTEC 4-cutter bits and what are the delivery options?
A: The full MAXTEC SDS Plus 4-cutter range is 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. VIP dedicated delivery is available UK-wide for urgent site requirements, dispatched within 30 minutes. Trade accounts and EDGE portal ordering are available for procurement teams.
