The Simpson SDS-Max Quad Head Drill Bit 1-1/4 in. x 36 in. Carbide is a premium rotary hammer bit engineered for demanding concrete and masonry drilling applications where speed, precision, and durability are non-negotiable. Built on a chromium-nickel-molybdenum steel alloy body with uniformly brazed carbide inserts, this bit delivers consistent, high-performance results in reinforced concrete, including applications where rebar penetration is required. Its patented quad-head geometry, high-volume multi-flute spiral, and SDS-max shank work together to maximize impact energy transfer, reduce operator fatigue, and keep deep-hole drilling jobs moving efficiently.

Key Features

• Uniformly Brazed Carbide Inserts - Precisely and consistently brazed carbide inserts maintain cutting integrity across the full life of the bit, delivering longer service life compared to standard tooling.
• Self-Centering Tips - Accurate hole placement from the first strike reduces repositioning time and keeps concrete drilling work on schedule.
• Chromium-Nickel-Molybdenum Steel Alloy Body - High-grade CrNiMo construction provides the hammering quality and structural resilience needed to withstand heavy-duty rotary hammer use over an extended service life.
• Heat-Treatment and Shot-Peened Finish - Proprietary heat-treatment procedures and a shot-peened finish increase surface hardness, improve drilling speed, reduce drill bit wear, and improve resistance to bending forces - protecting the bit and the operator's investment.
• ANSI Standard B212.15 Conformance - Meets recognized industry dimensional standards, ensuring consistent fit and compatibility with SDS-max rotary hammer tooling systems.
• High-Volume Multi-Flute Spiral - Quickly channels concrete dust out of the hole during drilling, reducing clogging and maintaining drilling speed throughout the cut.
• 4 x 90 deg. Quad-Head Geometry - Designed to crush through rebar and prevent sticking in reinforced concrete, keeping the bit moving in the most challenging structural drilling conditions.
• Proprietary Flute Geometry - Reduces vibration and optimizes impact energy transfer from the rotary hammer into the drill bit tip, enhancing drilling speed and reducing noise, stress, and vibration on the operator.

Why This Product

• Built for Reinforced Concrete - The 4 x 90 deg. quad-head dual-cutter geometry is specifically engineered to crush through rebar and prevent binding, making this bit a practical choice for structural concrete drilling where standard bits struggle or stall.
• Deep-Hole Capability With Operator Comfort - With 31 in. of drilling depth and a flute design that actively reduces vibration and noise, this bit handles demanding deep-hole applications while easing the physical toll on the operator over a long workday.
• Engineered for Durability and Speed Together - The combination of uniformly brazed carbide inserts, CrNiMo alloy construction, heat-treatment, and shot-peened finish addresses both longevity and performance in a single bit - fewer tool changes and faster cycle times on the job.
• Precision From the First Strike - Self-centering tips eliminate guesswork on hole placement in concrete and masonry, improving accuracy and reducing rework in high-production drilling environments.

Specifications

• Model Number (MPN): MDMX12536Q
• Brand: Simpson Strong-Tie
• Shank Type: SDS-max Shank
• Head Type: Quad Head (4x Drill Bit)
• Diameter: 1-1/4 in.
• Overall Length: 36 in.
• Drilling Depth: 31 in.
• Material: Hardened Steel (Chromium-Nickel-Molybdenum Steel Alloy Body with Carbide Tip)
• Standard Compliance: ANSI Standard B212.15
• Country of Origin: Germany

Approved Applications

• Drilling through reinforced concrete using SDS-max rotary hammers
• Penetrating rebar-reinforced substrates where standard bits may stick or bind
• Deep-hole drilling applications requiring up to 31 in. of drilling depth
• High-production concrete drilling where drilling speed, bit durability, and operator comfort are priorities
• Applications requiring precise hole placement in concrete, masonry, and similar hard materials