The Simpson SDS-Max Quad Head Drill Bit 1-3/4 in. x 23 in. Carbide is a premium rotary hammer bit engineered by Simpson for demanding concrete and masonry drilling applications, including anchor bolt installation and work in heavily reinforced concrete. Built on a proprietary flute geometry that reduces vibration and optimizes impact energy transfer, this quad-head bit delivers the drilling speed, dust removal efficiency, and long service life that professional contractors depend on for high-volume work.

Key Features

• Uniformly brazed carbide inserts - provide consistent tip integrity across the full cutting edge, resulting in longer bit life and fewer replacements on the job.
• Self-centering tips - ensure accurate hole placement from the first strike, reducing the need for repositioning and improving layout precision.
• Chromium-nickel-molybdenum steel alloy body - delivers superior hammering quality and extended service life under the repeated impact stress of rotary hammer drilling.
• Heat-treatment procedures and shot-peened finish - increase surface hardness, improve drilling speed, reduce drill bit wear, and improve resistance to bending forces so the bit holds up on tough substrates.
• Conforms to ANSI Standard B212.15 - ensures the bit meets established industry dimensional and performance standards for professional applications.
• High-volume, multi-flute spiral - quickly channels concrete dust from the hole to improve drilling speed and keep the cutting zone clear during deep hole drilling.
• 4 x 90 deg. head geometry - crushes through rebar and prevents sticking in reinforced concrete, keeping work moving without damaging the bit or stalling the tool.
• Quad-head dual-cutter design - engineered to improve both durability and drilling speed, making it well suited for contractors who need consistent results across many holes.

Why This Product

• Built to cut through rebar without stalling - the 4 x 90 deg. quad-head geometry is specifically designed to crush through rebar and resist sticking in reinforced concrete, a critical advantage when drilling anchor bolt holes in structural applications.
• Engineered for reduced operator fatigue - the proprietary flute geometry optimizes impact energy transfer from the rotary hammer into the bit tip, which actively reduces noise, stress, and vibration felt by the operator during extended drilling sessions.
• Long service life backed by material science - the combination of uniformly brazed carbide inserts, a chromium-nickel-molybdenum alloy body, and a heat-treated shot-peened finish work together to resist wear and bending forces, so the bit earns its cost across a high volume of holes.
• Precision dust management for faster, cleaner holes - the high-volume, double-helix multi-flute design channels concrete dust out of the hole efficiently, maintaining drilling speed and reducing the need to withdraw and clear the bit during deep anchor hole installations.

Specifications

• Model Number (MPN): MDMX17523Q
• Diameter: 1-3/4 in.
• Overall Length: 23 in.
• Drilling Depth: 18 in.
• Head Type: Quad Head - 4x Drill Bit
• Shank Type: SDS-max Shank
• Material: Hardened Steel (Chromium-Nickel-Molybdenum Steel Alloy Body)
• Tip Material: Carbide
• Standard Compliance: ANSI Standard B212.15
• Country of Origin: Germany

Approved Applications

The Simpson Strong-Tie MDMX17523Q quad-head SDS-max drill bit is engineered for demanding drilling and demolition tasks, including:

• Drilling into concrete, including reinforced concrete with rebar
• Creating anchor bolt and fastener holes requiring precise depth and diameter tolerances
• High-volume drilling applications in masonry and concrete structures where dust removal and speed are critical
• Professional and contractor-grade work demanding extended bit life and consistent performance
• Use with all current and older SDS-max rotary hammers

What's Included

• 1 x Simpson Strong-Tie MDMX17523Q 1-3/4 in. x 23 in. SDS-max Quad-Head Carb