The Simpson 7/8 in. x 36 in. SDS-Max Quad-Head Carbide Drill Bit is engineered for demanding concrete and masonry drilling where speed, accuracy, and durability are non-negotiable. Designed around a proprietary quad-head geometry and high-volume multi-flute spiral, this bit is built to handle deep-hole drilling in reinforced concrete - including applications where rebar is present - while actively reducing vibration and operator fatigue. Made in Germany to exacting standards, it delivers the performance and precision that professionals require on heavy rotary hammer work.

Key Features

• Uniformly Brazed Carbide Inserts - Precision brazing delivers consistent carbide bonding across the tip, extending bit life and maintaining reliable performance through repeated heavy-impact drilling cycles.
• Self-Centering Tips - Accurate hole placement from the first strike reduces misalignment, minimizes rework, and keeps drilling on target in both open and reinforced concrete.
• Chromium-Nickel-Molybdenum Steel Alloy Body - This high-performance alloy construction ensures superior hammering quality and extended service life under sustained heavy impact loads.
• Heat-Treatment and Shot-Peened Finish - Advanced heat-treatment procedures combined with a shot-peened finish increase surface hardness, improve drilling speed, reduce bit wear, and enhance resistance to bending forces during demanding applications.
• 4 x 90 deg. Quad-Head Geometry - Crushes through rebar and prevents sticking in reinforced concrete, keeping productivity high where conventional bits struggle or bind.
• High-Volume Multi-Flute Spiral - Quickly channels concrete dust and debris away from the hole, improving drilling speed and reducing heat buildup at the cutting tip.
• Patented Reinforced Core Flute Design - The high-volume, double-helix configuration maximizes energy transfer from the rotary hammer into the tip, boosting drilling efficiency and reducing noise and vibration felt by the operator.
• ANSI Standard B212.15 Compliant - Conformance to this industry standard ensures consistent dimensional accuracy, giving contractors confidence in fit and hole quality across professional applications.

Why This Product

• Built for Reinforced Concrete Without Compromise - The 4 x 90 deg. quad-head geometry is specifically engineered to crush through rebar and prevent bit sticking, making this the right choice for heavily reinforced structural concrete where standard bits fail or bind.
• Deep-Hole Capability With Active Vibration Reduction - With a 31 in. drilling depth and a proprietary flute geometry that optimizes impact energy transfer, this bit reaches where the job demands while keeping operator stress, noise, and vibration to a minimum on long drilling runs.
• Premium Materials That Extend Service Life - Uniformly brazed carbide inserts, a chromium-nickel-molybdenum alloy body, and a heat-treated shot-peened finish combine to deliver a bit that holds up under repeated heavy use - reducing downtime and replacement costs on active job sites.
• Precision You Can Count On From the First Hole - Self-centering tips eliminate guesswork at the start of each bore, ensuring accurate placement in concrete anchor and fastening applications where hole position directly affects structural performance.

Specifications

• Manufacturer Part Number (MPN): MDMX08736Q
• Brand: Simpson Strong-Tie
• Shank Type: SDS-max Shank
• Head Type: Quad Head - 4x Drill Bit
• Diameter: 7/8 in.
• Overall Length: 36 in.
• Drilling Depth: 31 in.
• Material: Hardened Steel (Chromium-Nickel-Molybdenum Alloy Body with Carbide Tip)
• Standard Compliance: ANSI Standard B212.15
• Country of Origin: Germany

Approved Applications

• Drilling into concrete, including heavily reinforced concrete with rebar
• Deep-hole drilling applications requiring up to 31 in. of drilling depth
• Demanding demolition and drilling tasks requiring premium SDS-max tooling
• Applications requiring accurate hole placement with self-centering tip technology
• High-speed concrete drilling where dust clearance and vibration reduction are critical

What's Included

• 1 x Simpson Strong-Tie MDMX08736Q 7/8 in.

Frequently Asked Questions

What type of rotary hammer is this drill bit compatible with?

This drill bit features an SDS-max shank, making it compatible with all SDS-max rotary hammers. The SDS-max shank interface is designed to optimize impact energy transfer from the rotary hammer into the drill bit tip, enhancing drilling speed and durability.

What is the maximum drilling depth this bit can achieve?

This bit has an overall length of 36 inches and a maximum drilling depth of 31 inches. The diameter is 7/8 inch, making it well-suited for deep anchor holes in concrete and masonry applications.

Can this drill bit be used in reinforced concrete containing rebar?

Yes. The quad-head design features a 4 x 90 deg. head geometry that is specifically engineered to crush through rebar and prevent the bit from sticking in reinforced concrete. The chromium-nickel-molybdenum steel alloy body and uniformly brazed carbide inserts further support reliable performance under these demanding conditions.

What standards does this drill bit conform to, and what materials is it made from?

This drill bit conforms to ANSI Standard B212.15 for consistent dimensional accuracy and industry-standard performance. The body is constructed from a chromium-nickel-molybdenum steel alloy and undergoes heat-treatment procedures with a shot-peened finish to increase surface hardness, improve drilling speed, reduce wear, and enhance resistance to bending forces.