Bosch Core Drill Bit Extension SDS Plus SpeedCore Thin Wall Adapter (Forged Alloy Steel Max 600 RPM Deep Concrete Brick Block Foundation Boring)

Bosch SpeedCore™ SDS-Plus Thin-Wall Core Bit Extension Shanks

The Bosch SpeedCore™ SDS-Plus thin-wall core bit extension shanks expand the working depth of rotary hammer core cutters across thick exterior brick walls, poured concrete foundations, and multi-wythe masonry blocks. Engineered to couple compact SDS-Plus rotary hammer drills directly to modular thin-wall core bit heads, these structural-grade alloy steel drive adapters deliver rigid percussive energy transfer and high-torque rotary drive up to a rated maximum of 600 RPM. Outfitted with precision-machined male threads that lock directly into thin-wall core bodies (fitting barrels 1-1/2 inches or longer), a slotted universal SDS-Plus shank interface, and high-impact heat-treated metallurgy that prevents dynamic shaft deflection, they equip commercial electrical contractors, HVAC mechanics, and plumbing installers with extended-depth hole boring reach in tight quarters.

Best Used For:

• Deep Electrical Conduit Wall Penetrations: Adding critical extension length to core bit assemblies to drill clean through-holes in thick multi-layered brick and CMU block walls for electrical service feeds.
• HVAC Line Set and Drain Sleeve Passages: Coring deep, aligned clearance pathways through foundational concrete and stone barriers for mini-split line sets and condensate drain lines.
• Plumbing Pipe and Waste Line Rough-Ins: Boring extended-depth holes through foundation walls and structural masonry for water supply lines, gas pipes, and DWV sleeves.

Key Performance & Safety Features

• Extended Deep-Wall Reach: Provides extended operational depth to regular core bit assemblies, ensuring deep penetration through thick foundation walls.
• High-Torque 600 RPM Rating: Engineered to transfer rotary-percussion kinetic impact energy smoothly at rotational speeds up to 600 RPM.
• Direct-Screw Threaded Integration: Precision-machined male threads allow standard thin-wall masonry core cutters to screw directly onto the extension mandrel.
• Universal SDS-Plus Connection: Slotted quick-change drive profile enables fast, one-handed insertion and removal in all standard SDS-Plus hammer chucks.
• Optimized for Compact Rotary Hammers: Works in tandem with lightweight SDS-Plus hammer drills, eliminating the need for bulky, heavy dedicated core drilling rigs.
• Heat-Treated Structural Alloy Steel: Heavy-duty forged alloy core resists high vibrational harmonic stresses and prevents dynamic shaft flexing during deep coring.

What's Included

• (1) Bosch SpeedCore™ SDS-Plus Thin-Wall Core Bit Extension Shank in User-Selected Model & Length:
  • T3925SC: 8" SDS-Plus SpeedCore Extension Shank
  • T3926SC: 12" SDS-Plus SpeedCore Extension Shank
  • T3927SC: 18" SDS-Plus SpeedCore Extension Shank

Technical Specifications

Pro-Tip: Before threading your SpeedCore thin-wall cutter onto the extension mandrel, apply a dab of high-temperature thread grease to the male threads; this prevents thread galling caused by high-impact hammer vibrations and ensures simple bit removal after deep wall coring.