This is a close-up, eye-level shot of a large, robust drill bit, angled upwards from the bottom right towards the top left. The drill bit has a wide, dark gray cylindrical body with horizontal ribs, and a smaller, pointed drill bit protruding from its center top, with a spiraled, dark gray shaft visible at the bottom right.
This is a close-up, eye-level shot of a large, robust drill bit, angled upwards from the bottom right towards the top left. The drill bit has a wide, dark gray cylindrical body with horizontal ribs, and a smaller, pointed drill bit protruding from its center top, with a spiraled, dark gray shaft visible at the bottom right.
This is a close-up, eye-level shot of a large, robust core drill bit, angled slightly to the right, against a plain white background. The bit has a wide, cylindrical body with horizontal grooves and a distinct bronze-colored cutting head featuring multiple sharp, protruding teeth.
This is a close-up image of a gray masonry hole saw. It has a ribbed, cylindrical body with a central pilot bit and carbide teeth along the rim for cutting through hard materials like concrete.
The image shows a large, heavy-duty circular hole saw for masonry, with a light gray, tiered cylindrical body and a bronze-colored cutting edge with teeth. A separate drill bit extends from the center of the cylinder to guide the cut.
This is a vertical, close-up shot of a large, metallic gray core drill bit. It features a wide, ribbed cylindrical head with several silver-colored cutting teeth at the very top, transitioning into a narrower, spiraled shaft at the bottom.
This is a close-up, eye-level shot of a large, robust drill bit, angled upwards from the bottom right towards the top left. The drill bit has a wide, dark gray cylindrical body with horizontal ribs, and a smaller, pointed drill bit protruding from its center top, with a spiraled, dark gray shaft visible at the bottom right.
This is a close-up, angled shot of a large, gray core drill bit. It features a wide, ribbed cylindrical drilling head with prominent copper-colored cutting teeth around its rim and a smaller, pointed drill bit protruding from its center, while a spiraled shaft extends from the bottom right.
This is a close-up, angled shot of a large, gray core drill bit. It features a wide, ribbed cylindrical drilling head with prominent copper-colored cutting teeth around its rim and a smaller, pointed drill bit protruding from its center, while a spiraled shaft extends from the bottom right.
BOSCH

Bosch SDS Plus SpeedCore Thin Wall Core Drill Bit Extension Shank Threaded Mandrel Adapter Concrete Masonry Brick Deep Wall Hole Boring Extension Tool

In stock
SKU: HC7501
$92.20

Diameter (Inches)
Description

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Extend Your Drilling Reach and Penetrate Extra Thick Structural Walls Using Heavy-Duty Thin-Wall Core Bit Extensions

Banish jobsite limitations and optimize your mechanical layouts with the professional-grade Bosch SDS-Plus SpeedCore Thin-Wall Core Bit Extension. Tailored specifically for commercial electrical contractors, HVAC installers, structural plumbers, and general utility technicians, this premium drive mandrel adapter allows smaller rotary hammers to bore safely through thick exterior partition walls and foundational barriers. Standard core barrels often fall short when passing through multi-layered brick or block walls, forcing contractors to source expensive custom tooling. This high-torque extension rod instantly bridges that gap, adding critical clearance length to your setup. Its advanced mechanical coupling system ensures that your existing thin-wall core bits can reach deep wall cavities while maintaining an exceptionally rigid and true rotational path.

Forged from structural-grade alloy steel and optimized for high-impact percussive applications, this industrial extension rod safely sustains continuous operational speeds of up to 600 RPM. Setting up the tooling is remarkably straightforward: simply thread your standard core bit directly onto the precision-machined male driver end, and the assembly is locked and ready for deployment. As a core component of the universal SDS-Plus ecosystem, the slotted drive shank snaps securely into any standard rotary hammer chuck, facilitating rapid, one-handed bit swaps in tight ceiling spaces or crowded trenches. By pairing this robust extension with lighter, more maneuverable compact hammer drills, you can easily execute flawless utility lines, pipe sleeves, and conduit paths inside cramped quarters without overloading your inventory with excessive gear.

Key Features

  • Extended Deep-Wall Reach: Adds critical structural length to regular core bit assemblies, providing an overall operational reach of at least 8 inches.
  • High-Torque RPM Compatibility: Engineered to transfer kinetic impact energy smoothly while rotating at velocities up to 600 RPM.
  • Secure Direct-Screw Integration: Precision-machined male threads allow standard thin-wall masonry core bits to screw straight onto the mandrel shank.
  • Universal SDS-Plus Connection: Slotted quick-change drive profile enables fast, one-handed insertion and removal from high-velocity hammer chucks.
  • Compact Workspace Optimization: Works in tandem with smaller rotary hammers to drill large utility passages inside confined or tight quarters.
  • Heavy-Duty Alloy Steel Core: Heat-treated structural steel construction resists intense percussive vibrations and prevents dynamic shaft flexing.

What's Included

  • (1) Bosch SDS-Plus SpeedCore™ Thin-Wall Core Bit Extension Shank

Specifications

Specification Profile Details / Performance Value
Brand Name Bosch
Product Line Association SpeedCore™ Series
Shank Drive Interface SDS-Plus Slotted Universal Quick-Change Fitment
Extension Reach Length 8.0 in. Minimum Total Combined Profile
Maximum Rated Velocity 600 RPM
Bit Attachment Method Direct-Screw Threaded Male Mandrel Fitting
Minimum Tool Core Fitment Fits Core Barrels 1-1/2 in. or Longer
Material Composition Heat-Treated structural Forged Alloy Tool Steel
Recommended Tool Type Compact or Smaller SDS-Plus Rotary Hammer Drills
Operational Drill Mode Hammer and Rotation Combination Setting
Primary Application Scope Thick Masonry, Concrete Block, Aggregate Brick Face, and Stone Walls
Measurement System Fractional Imperial (SAE) Dimensions

Pro-Tip: Before threading your core bit onto the extension shaft, clean any loose masonry dust or stone grit from the mating threads and apply a light dab of anti-seize or tool grease. The intense percussive vibration from a rotary hammer drill can pack loose material tightly into the threads, making it incredibly difficult to disassemble your tooling after a long day of boring through thick structural brick.