Bosch Core Bit Extension SDS Max Drive Shank Mandrel Adapter (Forged Alloy Steel Low Vibration Deep Foundation Concrete Brick Masonry Boring)

Bosch SDS-Max® Heavy-Duty Core Drill Bit Extension Drive Shanks

The Bosch SDS-Max® core drill bit extension drive shanks extend the reach of large-diameter rotary hammer core cutters across thick concrete foundations, retaining walls, and multi-wythe structural masonry barriers. Engineered from heat-treated, high-stress forged alloy tool steel, these industrial extension mandrels provide rigid percussive energy transmission from high-capacity demolition hammers directly to the cutting crown without rotational deflection or power loss. Outfitted with precision-machined heavy-duty drive threads that lock core cutters securely onto the rotational axis, a balanced geometric core that dampens harmonic vibration to shield tool motors, and a universal slotted SDS Max shank, they equip commercial plumbing contractors, structural HVAC installers, and mechanical electrical crews with extended-depth through-hole boring capability.

Best Used For:

• Deep Commercial Plumbing and Pipe Sleeves: Extending core bit reach through thick structural grade beams and poured concrete foundation footings to install water mains, sewer lines, and drainage sleeves.
• HVAC Line Set and Mechanical Duct Coring: Boring extended-depth clearance passages through exterior building envelopes, foundation walls, and stone facades for commercial refrigerant lines and ventilation ducting.
• High-Voltage Electrical Conduit Penetrations: Driving large-diameter core cutters deep into structural CMU block, solid concrete, and brick barrier walls for heavy electrical service feeders.

Key Performance & Safety Features

• Direct-Link Power Transmission: Solid-core alloy steel construction transfers maximum kinetic impact force from the hammer piston straight to the core teeth, minimizing energy loss.
• Extended Deep-Wall Capability: Adds substantial reach to standard core bit setups, allowing single-pass drilling through deep foundation walls and thick masonry headers.
• Reduced Harmonic Vibration: Balanced geometric core limits dynamic lateral shaft deflection, reducing operator fatigue and protecting internal hammer drill drive mechanisms.
• High-Torque SDS-Max Shank: Precision-milled slotted universal drive shank provides absolute mechanical retention and zero slippage inside heavy-duty combination hammer chucks.
• Premium Structural Alloy Steel: Drop-forged and heat-treated metallurgical formulation withstands continuous percussive friction, torsional shock, and thermal stress.
• Rigid Alignment Stability: Extra-rigid body profile maintains straight tracking inside deep boreholes, preventing bit binding and offset sleeve cuts.

What's Included

• (1) Bosch SDS-Max® Heavy-Duty Masonry Core Drill Bit Extension Shank in User-Selected Model & Length:
  • CAM008: 8" SDS-Max Heavy-Duty Core Bit Extension Shank
  • CAM018: 18" SDS-Max Heavy-Duty Core Bit Extension Shank

Technical Specifications

Pro-Tip: Before threading your heavy-duty SDS-Max core cutter onto the extension shaft, apply a small amount of high-temperature thread grease to the male mandrel threads; this prevents severe thread galling caused by continuous percussive hammer energy and allows quick bit unthreading after deep wall penetrations.