Simpson MDMX06821Q 11/16 in. x 21 in. SDS-max Shank Quad-Head Drill Bit is a premium-quality, professional-grade carbide drill bit from Simpson Strong-Tie, engineered for high-performance rotary hammer drilling in concrete and reinforced concrete. The quad-head dual-cutter design, proprietary flute geometry, and reinforced core work together to maximize energy transfer, enhance drilling speed, and reduce vibration and stress on the operator.

Key Features

• Uniformly brazed carbide inserts resulting in longer bit life
• Self-centering tips for accurate hole placement
• Chromium-nickel-molybdenum steel alloy body ensures hammering quality and extended service life
• Heat-treatment procedures and shot-peened finish increase surface hardness, drilling speed, reduces drill bit wear and improves resistance to bending forces
• Drill bit conforms to ANSI Standard B212.15
• High-volume, multi-flute spiral quickly channels concrete dust from the hole to improve drilling speed
• 4 x 90 deg. head geometry crushes through rebar and prevents sticking in reinforced concrete
• Patented, high-performance, reinforced core flute maximizes energy transfer from the rotary hammer to the drill bit tip
• Proprietary flute geometry reduces vibration and optimizes impact energy transfer, enhancing speed and durability while reducing noise and operator fatigue
• Chisel-shaped drill bit head penetrates material and directs concrete dust into the multi-flute spiral
• High-volume, double-helix design for fast, efficient material removal

Specifications

• Model Number (MPN): MDMX06821Q
• Brand: Simpson Strong-Tie
• Shank Type: SDS-max Shank
• Head Type: Quad Head 4x Drill Bit
• Diameter: 11/16 in.
• Overall Length: 21 in.
• Drilling Depth: 15-1/2 in.
• Material: Hardened Steel (Chromium-Nickel-Molybdenum Steel Alloy Body)
• Tip Material: Carbide
• ANSI Standard: B212.15
• Country of Origin: DE

Frequently Asked Questions

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

This drill bit features an SDS-max shank, which is the standard interface for large-format rotary hammers. The SDS-max shank design provides a secure, tool-free bit connection and is the industry-standard shank type for professional-grade rotary hammers used in heavy concrete drilling applications.

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

Yes. The 4 x 90 deg. head geometry is specifically designed to crush through rebar and prevent the bit from sticking in reinforced concrete, making it well suited for demanding applications where rebar may be encountered.

What design features help reduce operator fatigue during use?

The proprietary flute geometry reduces vibration and optimizes impact energy transfer from the rotary hammer into the drill bit tip. This design enhances drilling speed and durability while reducing noise, stress, and vibration on the operator during extended use.

What quality standards does this drill bit meet?

This drill bit conforms to ANSI Standard B212.15, ensuring it meets precise tolerance requirements for professional-grade drilling applications. The chromium-nickel-molybdenum steel alloy body, heat-treatment procedures, and shot-peened finish further ensure it meets the highest industry standards for hardness, durability, and performance.

Note: Product dimensions may differ from picture. Please see the item specifications above for accurate measurements.