The Simpson 1/2 in. x 21 in. SDS-max 2-Cutter Head Carbide Drill Bit is a premium-grade rotary hammer bit engineered for demanding concrete drilling applications, including work in reinforced concrete where rebar contact is unavoidable. Built on a proprietary flute geometry that reduces vibration and optimizes impact energy transfer from the rotary hammer into the bit tip, this Simpson drill bit delivers enhanced drilling speed and durability while reducing noise, stress, and fatigue on the operator. Whether you are boring anchor holes in structural slabs or driving through reinforced concrete walls, this SDS-max shank bit is built to keep up with professional and commercial workloads.

Key Features

• Uniformly Brazed Carbide Inserts - Precision, consistent brazing across the cutting inserts means the bit holds its edge longer, reducing replacement frequency on high-volume jobsites.
• Self-Centering Tips - The tip seats accurately from the first strike, so holes land exactly where intended and rework from wandering or walking is eliminated.
• Chromium-Nickel-Molybdenum Steel Alloy Body - This high-grade alloy construction delivers superior resistance to the repeated impact loads of rotary hammer use, extending overall service life under heavy professional use.
• Heat-Treatment and Shot-Peened Finish - Advanced surface hardening increases hardness and drilling speed, reduces bit wear, and improves resistance to bending forces so the bit holds up under lateral stress.
• High-Volume Multi-Flute Spiral - Rapidly channels concrete dust out of the hole during drilling, keeping the cutting zone clear and maintaining consistent drilling speed throughout the depth of the bore.
• 4 x 90 deg. Head Geometry - Crushes through rebar and prevents the bit from sticking in reinforced concrete, keeping production moving without the need to stop and free a seized bit.
• 2-Cutter Head Design - Delivers all the durability and speed advantages of the bit's engineered geometry in a configuration well suited to precision anchor and fastener hole applications.
• ANSI Standard B212.15 Compliant - Conformance to this recognized standard means the bit meets defined tolerances for diameter and performance, supporting consistent, predictable results on specification-driven projects.

Why This Product

• Engineered to Work Through Rebar Without Stalling - The 4 x 90 deg. head geometry is specifically designed to crush through rebar and prevent sticking, making this bit a reliable choice for reinforced concrete work where other bits frequently seize or deflect.
• Operator Comfort Is Built Into the Design - The proprietary flute geometry actively reduces vibration and noise transferred to the operator, which matters on long drilling sessions where fatigue and repetitive stress are real concerns.
• German-Crafted Materials and Heat Treatment for Long Bit Life - The combination of a chromium-nickel-molybdenum alloy body, uniformly brazed carbide inserts, heat-treatment procedures, and a shot-peened finish means this bit is built to outlast lower-grade alternatives under the same heavy use conditions.
• Spec-Ready ANSI Compliance for Commercial and Structural Projects - Conformance to ANSI Standard B212.15 makes this bit appropriate for projects where standardized tool performance is a specification requirement, removing guesswork when selecting tooling for anchoring or structural drilling applications.

Specifications

• Model Number (MPN): MDMX05021
• Brand: Simpson Strong-Tie
• Shank Type: SDS-max Shank
• Head Type: 2-Cutter Head
• Diameter: 1/2 in.
• Overall Length: 21 in.
• Drilling Depth: 15-1/2 in.
• Material: Hardened Steel (Chromium-Nickel-Molybdenum Steel Alloy Body with Carbide Inserts)
• ANSI Standard: ANSI Standard B212.15
• Country of Origin: Germany

Approved Applications

• Drilling into concrete with SDS-max rotary hammers
• Drilling through reinforced concrete - the 4 x 90 deg. head geometry crushes through rebar and prevents sticking
• High-volume concrete dust removal drilling applications requiring multi-flute spiral clearance
• Professional and commercial construction applications requiring ANSI Standard B212.15 compliance
• Demolition and drilling tasks requiring premium-quality, extended-life carbide drill bits

What's Included

• 1 x Simpson Strong-Tie MDMX05021 1/2 in. x 21 in. SDS-max 2-Cutter Head Carbide Drill Bit