Product Description
The Simpson SDS-Max Quad Head Drill Bit 1-1/4 in. x 23 in. Carbide is a heavy-duty rotary hammer bit engineered for demanding concrete and masonry drilling applications where speed, precision, and durability are non-negotiable. Built around a high-volume, double-helix quad-head design with a patented, high-performance, reinforced core flute, this bit maximizes energy transfer from the rotary hammer into the tip, delivering faster penetration rates and longer service life in reinforced concrete, block, and similar hard materials. Conforming to ANSI Standard B212.15 and featuring an SDS-max shank for secure, positive drive engagement, this bit is purpose-built for professionals who need reliable, consistent results on large-diameter holes up to 18 in. deep.
Key Features
- Quad-Head Double-Helix Design with Reinforced Core Flute - The patented, high-performance core flute maximizes energy transfer from the rotary hammer into the drill tip, increasing drilling speed and durability while reducing operator fatigue caused by vibration and noise.
- 4 x 90 deg. Head Geometry - Crushes through rebar and prevents the bit from sticking in reinforced concrete, allowing for uninterrupted drilling even in the most heavily reinforced slabs and walls.
- Uniformly Brazed Carbide Inserts - Consistent, precision brazing across all carbide tips maintains cutting performance over extended use, resulting in longer bit life and fewer replacements on the job.
- Self-Centering Tips - Accurate hole placement is established from first contact, reducing the likelihood of bit walking or the need for corrections, which saves time and material.
- Chromium-Nickel-Molybdenum Steel Alloy Body - This high-grade steel alloy provides exceptional hammering quality and extended service life under the sustained high-impact conditions of rotary hammer drilling.
- Heat-Treated and Shot-Peened Finish - These surface treatments increase hardness, accelerate drilling speed, reduce bit wear, and improve resistance to bending forces, keeping the bit performing reliably over its full service life.
- High-Volume Multi-Flute Spiral - Rapidly channels concrete dust out of the hole during drilling, reducing resistance and improving drilling speed in deep-hole applications.
- ANSI Standard B212.15 Compliance - Meets established industry standards for rotary hammer drill bits, giving professionals confidence in dimensional accuracy and consistent performance across compatible tooling.
Why This Product
- Built to drill through rebar without slowing down - The 4 x 90 deg. quad-head geometry is specifically engineered to crush through rebar and resist sticking in reinforced concrete, making this bit a dependable choice for structural drilling where rebar interference is a constant challenge.
- Engineered for reduced operator strain on extended jobs - The proprietary flute geometry optimizes impact energy transfer while actively reducing vibration and noise at the point of contact, so operators experience less fatigue and stress during prolonged rotary hammer use.
- Premium materials and treatments combine for long-term value - A chromium-nickel-molybdenum steel alloy body, uniformly brazed carbide inserts, heat treatment, and a shot-peened finish work together to extend service life and reduce the frequency of bit replacement on high-volume drilling projects.
- Precision from the first hole to the last - Self-centering tips ensure accurate positioning on every hole, and the high-volume multi-flute spiral clears debris efficiently, maintaining consistent drilling performance across the full 18 in. drilling depth throughout the life of the bit.
Specifications
- Attribute: Value
- Model Number (MPN): MDMX12523Q
- Brand: Simpson Strong-Tie
- Head Type: Quad Head / 4x Drill Bit
- Shank Type: SDS-max Shank
- Diameter: 1-1/4 in.
- Overall Length: 23 in.
- Drilling Depth: 18 in.
- Material: Hardened Steel (Chromium-Nickel-Molybdenum Steel Alloy)
- Tip Material: Carbide (Uniformly Brazed)
- Finish: Shot-Peened / Heat-Treated
- Compliance Standard: ANSI Standard B212.15
- Country of Origin: Germany
Frequently Asked Questions
- What type of rotary hammer is this drill bit compatible with?
- This drill bit features an SDS-max shank, making it compatible with SDS-max rotary hammers. The SDS-max shank provides secure, tool-free bit changes and positive drive engagement for reliable performance during heavy-duty drilling applications.
- What is the drilling depth and overall length of this bit?
- The Simpson MDMX12523Q has an overall length of 23 inches and a maximum drilling depth of 18 inches. The diameter is 1-1/4 inches, making it well suited for larger-diameter holes in concrete and masonry applications.
- Can this drill bit be used in reinforced concrete containing rebar?
- Yes. The quad-head design features a 4 x 90 deg. head geometry that is specifically engineered to crush through rebar and prevent the bit from sticking in reinforced concrete, allowing for uninterrupted drilling performance even in heavily reinforced applications.
- What materials and treatments are used to ensure the durability of this drill bit?
- The bit body is constructed from a chromium-nickel-molybdenum steel alloy for exceptional hammering quality and extended service life. It also undergoes heat-treatment procedures and receives a shot-peened finish, which increases surface hardness, improves drilling speed, reduces bit wear, and enhances resistance to bending forces. Additionally, the carbide inserts are uniformly brazed for consistent cutting performance and longer bit life.
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