The Simpson 5/8 in. x 21 in. SDS-Max Quad-Head Carbide Drill Bit is a premium rotary hammer bit engineered for demanding concrete and masonry drilling applications, including work in reinforced concrete. Built on a chromium-nickel-molybdenum steel alloy body with uniformly brazed carbide inserts and a quad-head cutting geometry, this bit is designed to deliver fast, accurate, and durable performance in the toughest conditions. Its proprietary flute geometry optimizes impact energy transfer from the rotary hammer into the tip, improving drilling speed while reducing vibration, noise, and operator fatigue.

Key Features

• Uniformly Brazed Carbide Inserts - Precisely and uniformly brazed inserts deliver consistent cutting performance and longer bit life, reducing the need for frequent replacements on the job.
• Self-Centering Tips - Self-centering tips ensure accurate hole placement from the first strike, eliminating bit walk and improving layout precision in concrete and masonry work.
• Chromium-Nickel-Molybdenum Steel Alloy Body - This premium steel alloy body is engineered to withstand the repeated impact stress of heavy rotary hammer use, providing superior hammering quality and extended service life.
• Heat-Treatment and Shot-Peened Finish - Advanced heat-treatment procedures combined with a shot-peened finish increase surface hardness, accelerate drilling speed, reduce bit wear, and improve resistance to bending forces.
• 4 x 90 deg. Quad-Head Geometry - The four-point cutting head crushes through rebar and prevents the bit from sticking in reinforced concrete, keeping work moving without interruption.
• High-Volume, Multi-Flute Spiral - The high-volume, double-helix flute design channels concrete dust rapidly out of the hole, improving drilling speed and reducing clogging during deep hammer drilling.
• Optimized Impact Energy Transfer - The proprietary flute geometry directs energy efficiently from the rotary hammer into the drill tip, enhancing speed and durability while lowering vibration and noise on the operator.
• ANSI Standard B212.15 Conformance - This bit is designed and manufactured to meet ANSI Standard B212.15, providing assurance of dimensional and performance consistency.

Why This Product

• Built for Reinforced Concrete - The 4 x 90 deg. quad-head cutting geometry is specifically engineered to crush through rebar and resist sticking, making this bit a reliable choice for concrete drilling where rebar interference is a real concern.
• Faster Drilling with Less Fatigue - The combination of a high-volume multi-flute spiral, optimized energy transfer, and shot-peened finish work together to improve drilling speed while actively reducing vibration and noise, so operators can work longer with less strain.
• Long-Term Durability Built In - Uniformly brazed carbide inserts, a chromium-nickel-molybdenum steel alloy body, and a heat-treated finish all contribute to a bit designed to hold up under heavy, repeated use rather than wear out quickly.
• Precision from the First Strike - Self-centering tips paired with ANSI B212.15 conformance mean this bit starts accurately and performs consistently, reducing layout errors and rework on critical anchor and fastener installations.

Specifications

• Model Number (MPN): MDMX06221Q
• Shank Type: SDS-max Shank
• Head Type: Quad Head - 4x Drill Bit
• Diameter: 5/8 in.
• Overall Length: 21 in.
• Drilling Depth: 15-1/2 in.
• Material: Hardened Steel (Chromium-Nickel-Molybdenum Steel Alloy Body with Carbide Inserts)
• Standard Conformance: ANSI Standard B212.15
• Country of Origin: Germany

Approved Applications

• Drilling into concrete,