The Simpson MDMX13723Q 1-3/8 in. x 23 in. SDS-max Shank Quad-Head Drill Bit is a premium carbide-tipped rotary hammer bit engineered for professional-grade drilling into concrete and reinforced concrete. Built on a chromium-nickel-molybdenum steel alloy body and featuring a patented quad-head geometry, this bit is designed to handle the most demanding drilling applications where speed, accuracy, and long service life are non-negotiable. The proprietary flute geometry optimizes impact energy transfer from the rotary hammer into the drill bit tip, reducing noise, stress, and vibration on the operator while maintaining consistent high performance.

Key Features

• Uniformly brazed carbide inserts - deliver consistent bond strength across the cutting head, 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 overall drilling precision.
• Chromium-nickel-molybdenum steel alloy body - provides the structural integrity needed to withstand repeated hammer blows, ensuring hammering quality and extended service life in tough conditions.
• Heat-treatment procedures and shot-peened finish - increase surface hardness, improve drilling speed, reduce drill bit wear, and improve resistance to bending forces, keeping the bit performing longer under stress.
• High-volume, multi-flute spiral - quickly channels concrete dust from the hole during drilling, maintaining a clear bore and improving drilling speed by preventing debris buildup.
• 4 x 90 deg. head geometry - crushes through rebar and prevents sticking in reinforced concrete, allowing uninterrupted drilling progress on rebar-dense slabs and walls.
• Patented, high-performance reinforced core flute with double-helix design - maximizes energy transfer from the rotary hammer to the bit tip, enhancing drilling speed and reducing vibration felt by the operator during extended use.
• Conforms to ANSI Standard B212.15 - confirms the bit meets recognized industry dimensional and performance standards, giving professionals confidence in fit and compatibility across SDS-max rotary hammers.

Why This Product

• Built specifically for reinforced concrete - the quad-head, 4 x 90 deg. geometry is engineered to crush through rebar rather than deflect or bind, making this bit a practical choice for slabs, foundations, and structural walls where rebar is a constant obstacle.
• Reduced operator fatigue on long drilling runs - the proprietary flute geometry reduces vibration and optimizes impact energy transfer into the tip rather than back into the operator, making extended drilling sessions less taxing on the body.
• Premium materials extend bit life and lower replacement costs - the combination of uniformly brazed carbide inserts, a heat-treated and shot-peened alloy body, and self-centering tips means this bit is built to last through heavy-duty use rather than wearing out prematurely.
• Designed for professional SDS-max compatibility - the SDS-max shank interface fits current and older SDS-max rotary hammers, giving contractors a reliable upgrade option for high-powered drilling equipment already on the job site.

Specifications

• Model Number (MPN): MDMX13723Q
• Brand: Simpson Strong-Tie
• Shank Type: SDS-max Shank
• Head Type: Quad Head - 4x Drill Bit
• Diameter: 1-3/8 in.
• Overall Length: 23 in.
• Drilling Depth: 18 in.
• Material: Hardened Steel (Chromium-Nickel-Molybdenum Steel Alloy)
• Tip Material: Carbide
• ANSI Standard: ANSI Standard B212.15
• Country of Origin: Germany

Approved Applications

• Drilling into concrete, including reinforced concrete
• Applications requiring penetration through rebar - 4 x 90 deg. head geometry crushes through rebar and prevents sticking
• Professional rotary hammer drilling requiring accurate hole placement via self-centering tips
• High-volume drilling tasks where rapid concrete dust evacuation is critical to speed and bit longevity
• Demanding demolition and drilling operations requiring reduced operator vibration and fatigue
• Compatible with SDS-max rotary hammers - fits all current and older SDS-max rotohammers