The Simpson MDMX10021Q 1 in. x 21 in. SDS-max Shank Quad-Head Drill Bit by Simpson Strong-Tie is a premium-quality, professional-grade carbide-tipped rotary hammer drill bit engineered for demanding concrete and reinforced concrete drilling applications. Featuring a proprietary quad-head dual-cutter design and high-volume double-helix flute geometry, this bit delivers exceptional drilling speed, reduced operator vibration, and outstanding durability in the most challenging jobsite conditions.

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 rotary hammer to drill bit tip
• Proprietary flute geometry reduces vibration and optimizes impact energy transfer, enhancing drilling speed while reducing noise and operator stress
• SDS-max shank with chisel-shaped drill bit head penetrates material and directs concrete dust into the multi-flute spiral

Specifications

• MPN: MDMX10021Q
• Brand: Simpson Strong-Tie
• Shank Type: SDS-max Shank
• Head Type: Quad Head 4x Drill Bit
• Diameter: 1 in.
• Overall Length: 21 in.
• Drilling Depth: 17 in.
• Material: Hardened Steel (Chromium-Nickel-Molybdenum Steel Alloy)
• Tip Material: Carbide
• Standards Compliance: 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, making it compatible with all SDS-max rotary hammers. The shank's chisel-shaped head is designed to penetrate material efficiently while directing concrete dust into the multi-flute spiral.

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

Yes. The 4 x 90 deg. quad-head geometry is specifically engineered to crush through rebar and prevent the bit from sticking in reinforced concrete, making it well-suited for demanding structural drilling applications.

What is the maximum drilling depth this bit can achieve?

This bit provides a drilling depth of 17 in., with an overall length of 21 in. The high-volume, multi-flute spiral quickly channels concrete dust away from the hole to maintain drilling speed throughout the full depth.

What design features help reduce operator fatigue and vibration?

The proprietary flute geometry reduces vibration and optimizes impact energy transfer from the rotary hammer into the drill bit tip. Combined with the shot-peened finish and heat-treated chromium-nickel-molybdenum steel alloy body, these features work together to reduce noise, stress, and vibration on the operator during extended use.

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