The Simpson SDS-max Quad Head Drill Bit 1-1/8 in. x 36 in. Carbide is a premium-grade rotary hammer bit engineered by Simpson for demanding concrete drilling applications, including deep structural holes and work in reinforced concrete where rebar penetration is unavoidable. Built on a proprietary quad-head design with a high-volume, double-helix flute geometry, this bit is purpose-built to maximize energy transfer, reduce operator fatigue, and sustain high drilling speeds through tough substrates. The reinforced core flute and uniformly brazed carbide tip combine to deliver the kind of durability and precision that professional contractors depend on for critical anchoring and structural drilling tasks.

Key Features

• Uniformly Brazed Carbide Inserts - Precision brazing delivers consistent carbide bonding across the tip, translating to longer bit life and reliable performance through repeated high-impact cycles.
• Self-Centering Tips - Engineered tip geometry locks onto the target surface on first contact, reducing bit drift and improving hole placement accuracy for cleaner, more precise results.
• Chromium-Nickel-Molybdenum Steel Alloy Body - This premium alloy construction ensures superior hammering quality and an extended service life under the sustained stress of heavy rotary hammer use.
• Heat-Treatment and Shot-Peened Finish - Advanced heat-treatment procedures combined with a shot-peened surface finish increase surface hardness, improve drilling speed, reduce drill bit wear, and enhance resistance to bending forces - keeping the bit performing longer between replacements.
• High-Volume, Multi-Flute Spiral - Quickly channels concrete dust out of the hole during drilling, maintaining a clear cutting path and sustaining faster drilling speeds throughout the depth of the hole.
• 4 x 90 deg. Quad-Head Geometry - Crushes through rebar and prevents the bit from sticking in reinforced concrete, making it a reliable choice for structural drilling where embedded steel is likely to be encountered.
• Patented Reinforced Core Flute - The high-performance reinforced core flute maximizes energy transfer from the rotary hammer into the bit tip, boosting drilling efficiency and reducing stress on both the tool and the operator.
• ANSI Standard B212.15 Compliant - Conforms to ANSI Standard B212.15, ensuring dimensional accuracy and full compatibility with standard SDS-max rotary hammer tools.

Why This Product

• Built for Reinforced Concrete - The 4 x 90 deg. quad-head geometry is specifically engineered to crush through rebar rather than deflect or bind, making this bit a dependable tool for structural concrete drilling where reinforcement cannot be avoided.
• Deep-Hole Reach with Sustained Performance - With a 31 in. drilling depth and a reinforced core flute designed to maximize energy transfer, this bit handles demanding deep-anchor and structural drilling tasks without sacrificing speed or durability as depth increases.
• Reduced Operator Fatigue Through Smart Engineering - The proprietary flute geometry is optimized to reduce vibration and noise transferred to the operator, while the self-centering tip eliminates the extra effort of repositioning after bit drift - keeping the work efficient and the operator in control.
• Long-Term Value Through Premium Materials - The combination of uniformly brazed carbide inserts, a chromium-nickel-molybdenum alloy body, and a heat-treated shot-peened finish means this bit is built to resist wear, bending, and premature failure, reducing the frequency and cost of bit replacement on the job.

Specifications

• Model Number (MPN): MDMX11236Q
• Brand: Simpson Strong-Tie
• Shank Type: SDS-max Shank
• Head Type: Quad Head - 4x Drill Bit
• Diameter: 1-1/8 in.
• Overall Length: 36 in.
• Drilling Depth: 31 in.
• Material: Hardened Steel (Chromium-Nickel-Molybdenum Alloy Body with Carbide Tip)
• ANSI Standard: B212.15
• Country of Origin: Germany

Approved Applications

• Drilling into reinforced concrete where rebar penetration is required
• Deep-hole drilling in concrete structures requiring up to 31 in. of drilling depth
• High-speed concrete drilling using SDS-max rotary hammer tools