The Simpson SDS-Plus Quad Head Carbide Drill Bit, 3/4 in. x 18 in. is a premium-quality, professional-grade rotohammer bit engineered to the highest industry standards for demanding concrete drilling applications, including heavily reinforced slabs and structural concrete where rebar may be encountered. Built on a chromium-nickel-molybdenum steel alloy body with a carbide-tipped Quad Head, this bit is purpose-built to deliver fast, precise holes with a long service life - even under the punishing conditions of production-level jobsite work.

Key Features

• Uniformly brazed carbide inserts - consistent bond quality across the entire tip means the cutting edge holds longer, reducing the frequency of bit replacement on the job.
• Centering tip design - helps the bit self-locate on the surface at the start of each hole, so spot drilling is quick and accurate without walking or slipping.
• Chromium-nickel-molybdenum steel alloy body - this high-performance alloy absorbs the repeated impact of rotohammer drilling without fatigue, supporting hammering quality and an extended service life.
• Heat-treatment procedures and shot-peened finish - increase surface hardness and resistance to bending forces while improving drilling speed and reducing wear over the life of the bit.
• 4 x 90 deg. Quad Head geometry - four cutting edges at 90 deg. intervals crush through rebar and prevent the bit from sticking in reinforced concrete, keeping work moving without costly stoppages.
• High-volume, multi-flute spiral - aggressively channels concrete dust out of the hole as drilling progresses, maintaining clean bore paths and sustaining faster drilling speeds throughout the cut.
• ANSI Standard B212.15 compliance - confirms the bit meets established dimensional and performance tolerances, ensuring reliable fit and compatibility with SDS-plus rotohammers across major brands.
• 16 in. drilling depth on an 18 in. overall length - provides genuine deep-drilling reach for anchor installations, through-bolts, and other applications requiring extended penetration into concrete assemblies.

Why This Product

• Built specifically for reinforced concrete - the proprietary 4 x 90 deg. Quad Head geometry is engineered to crush through rebar rather than bind against it, making this bit a practical choice for structural drilling where standard bits stall or get stuck.
• Professional-grade construction from a trusted brand - Simpson Strong-Tie designed this bit to meet precise tolerance requirements and conform to ANSI Standard B212.15, giving contractors confidence that the tool will perform consistently across a full day of heavy use.
• Faster drilling with less downtime - the combination of the multi-flute dust-clearing spiral, heat-treated surface hardness, and uniformly brazed carbide inserts work together to sustain drilling speed and minimize the interruptions caused by clogged holes or premature tip wear.
• Deep reach for anchor and through-bolt work - with 16 in. of usable drilling depth, this bit handles the long-reach holes required for post-installed anchors and threaded rod embedment without needing an extension, streamlining setup on the jobsite.

Specifications

• Model Number (MPN): MDPL07518Q
• Brand: Simpson Strong-Tie
• Shank Type: SDS-plus Shank
• Head Type: Quad Head 4x Drill Bit
• Diameter: 3/4 in.
• Overall Length: 18 in.
• Drilling Depth: 16 in.
• Material: Hardened Steel (Chromium-Nickel-Molybdenum Steel Alloy Body with Carbide Tip)
• Standard Compliance: ANSI Standard B212.15
• Country of Origin: Germany

Frequently Asked Questions

What type of shank does the MDPL07518Q use, and which rotohammers is it compatible with?

The MDPL07518Q features an SDS-plus shank, which is designed to fit all SDS-plus rotohammer chucks. This includes current and older SDS-plus rotohammers from brands such as AEG, Black & Decker, Bosch, DeWalt, Hitachi, Hilti, Kango, Makita, Metabo, Milwaukee, Porter Cable, Ramset, Red Head, Ryobi, and Skil.

Can this drill bit be used in reinforced concrete that contains rebar?

Yes. The MDPL07518Q is specifically engineered with a 4 x 90 deg. Quad Head geometry that crushes through rebar and prevents the bit from sticking in reinforced concrete, making it well suited for heavy-duty concrete drilling applications where rebar may be encountered.

What is the maximum drilling depth this bit can achieve?

The MDPL07518Q has a drilling depth of 16 in., with an overall length of 18 in. The difference between overall length and drilling depth accounts for the shank and any necessary clearance in the chuck.

What design features contribute to the long service life and durability of this bit?

Several proprietary features work together to maximize durability and service life: uniformly brazed carbide inserts resist wear at the tip; a chromium-nickel-molybdenum steel alloy body withstands hammering forces; heat-treatment procedures and a shot-peened finish increase surface hardness and resistance to bending; and the high-volume, multi-flute spiral efficiently channels concrete dust out of the hole to reduce friction and heat buildup during drilling.

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