The Simpson 5/8 in. x 18 in. SDS-Plus Quad Head Carbide Drill Bit is a professional-grade rotary hammer bit engineered for demanding concrete and masonry drilling applications, including work in reinforced concrete where rebar contact is unavoidable. Built to the highest industry standards from a chromium-nickel-molybdenum steel alloy body with uniformly brazed carbide inserts, this bit delivers the durability, speed, and precision that structural and concrete drilling professionals require. The SDS-plus shank provides secure, tool-free bit changes in compatible rotary hammers, making it a reliable choice for contractors who need consistent performance on the job site.

Key Features

• 4 x 90 deg. Quad Head geometry - crushes through rebar and prevents sticking in reinforced concrete, keeping your work moving without the frustration of a bit locking up mid-hole
• Uniformly brazed carbide inserts - deliver consistent cutting performance across the full service life of the bit, reducing premature wear and the cost of frequent replacements
• Chromium-nickel-molybdenum steel alloy body - provides the structural integrity needed to withstand high-impact hammering without cracking or deforming under heavy-duty use
• Heat-treatment procedures and shot-peened finish - increase surface hardness, drilling speed, reduce drill bit wear, and improve resistance to bending forces so the bit holds up under sustained load
• High-volume, multi-flute spiral - quickly channels concrete dust from the hole to improve drilling speed and prevent clogging that slows productivity
• Centering tip design - facilitates easy spot drilling so you can position holes accurately without the bit walking across the surface
• Conforms to ANSI Standard B212.15 - meets established industry tolerance requirements, giving you confidence that hole diameter and bit geometry are within spec for anchor installations and other precision applications
• SDS-plus shank - locks securely into compatible rotary hammers for tool-free bit changes and reliable energy transfer during high-impact drilling

Why This Product

• Built specifically for reinforced concrete - the Quad Head tip geometry is engineered to crush through embedded rebar and resist sticking, making this bit a practical choice for structural concrete work where standard tips struggle or bind
• Premium materials and treatment for extended service life - the combination of a chromium-nickel-molybdenum alloy body, uniformly brazed carbide inserts, and a heat-treated, shot-peened finish means fewer bit changes and lower long-term tooling costs on demanding jobsites
• Manufactured to precise tolerances - conformance to ANSI Standard B212.15 and proprietary features developed for Simpson ensure that hole sizing is accurate and consistent, which matters when installing anchors or fasteners with tight tolerance requirements
• 16 in. usable drilling depth in an 18 in. overall package - the generous drilling depth handles thick concrete sections and deep anchor placements that shorter bits simply cannot reach, expanding the range of applications this single bit can address

Specifications

• MPN: MDPL06218Q
• Brand: Simpson Strong-Tie
• Shank Type: SDS-plus Shank
• Head Type: Quad Head 4x Drill Bit
• Diameter: 5/8 in.
• Drilling Depth: 16 in.
• Overall Length: 18 in.
• Material: Hardened Steel
• Standard Compliance: ANSI Standard B212.15
• Country of Origin: Germany

Frequently Asked Questions

What type of shank does the MDPL06218Q use, and which rotary hammers is it compatible with?

The MDPL06218Q features an SDS-plus shank, which is the standard quick-release interface used by a wide range of professional and consumer-grade rotary hammers. This shank type allows for tool-free bit changes and secure locking during high-impact drilling operations.

What makes the Quad Head design on this drill bit different from a standard tip?

The 4 x 90 deg. Quad Head geometry is specifically engineered to crush through rebar and prevent the bit from sticking in reinforced concrete. This design distributes cutting force across four contact points, making it significantly more effective than a standard tip when drilling through concrete that contains embedded steel reinforcement.

What is the actual drilling depth of the MDPL06218Q, and how does that differ from its overall length?

The MDPL06218Q has an overall length of 18 in. and a usable drilling depth of 16 in. The difference accounts for the SDS-plus shank portion that seats inside the rotary hammer chuck, which is not part of the active drilling length.

What material is the drill bit body made from, and how is it treated for durability?

The bit body is constructed from a chromium-nickel-molybdenum steel alloy, which is known for its exceptional toughness and resistance to impact stress. It undergoes heat-treatment procedures and receives a shot-peened finish that increases surface hardness, improves resistance to bending forces, and reduces wear during extended use - all while conforming to ANSI Standard B212.15.

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