Bosch T3923SC 4-inch SDS-plus SpeedCore thin wall core bit extension highlighting the threaded connection end and the heavy-duty steel shank.
Diagram showing the assembly of the Bosch SDS-plus core bit extension system, featuring the mandrel assembly, pilot bit, and high-grade tungsten carbide core bit with an ejector hole.
Graphic displaying the ideal materials for the Bosch SpeedCore thin wall core bit extension, including masonry, brick, block, and concrete.
Angled view of a Bosch thin wall core bit with a pilot bit installed, attached to the 4-inch SDS-plus core bit extension for deep concrete drilling.
Side profile of the Bosch core bit connected to the T3923SC 4-inch SDS-plus extension, demonstrating the seamless two-piece assembly ready for heavy-duty drilling.
Close-up of a worker using a Bosch hammer drill equipped with a masonry bit to precisely drill a hole through a metal electrical box mounted on a concrete block wall.
Worker wearing heavy-duty gloves operating a Bosch hammer drill with a masonry bit to secure a metal electrical junction box to a concrete block wall.
Bosch T3923SC 4-inch SDS-plus SpeedCore thin wall core bit extension highlighting the threaded connection end and the heavy-duty steel shank.
Diagram showing the assembly of the Bosch SDS-plus core bit extension system, featuring the mandrel assembly, pilot bit, and high-grade tungsten carbide core bit with an ejector hole.
Graphic displaying the ideal materials for the Bosch SpeedCore thin wall core bit extension, including masonry, brick, block, and concrete.
Angled view of a Bosch thin wall core bit with a pilot bit installed, attached to the 4-inch SDS-plus core bit extension for deep concrete drilling.
Side profile of the Bosch core bit connected to the T3923SC 4-inch SDS-plus extension, demonstrating the seamless two-piece assembly ready for heavy-duty drilling.
Close-up of a worker using a Bosch hammer drill equipped with a masonry bit to precisely drill a hole through a metal electrical box mounted on a concrete block wall.
Worker wearing heavy-duty gloves operating a Bosch hammer drill with a masonry bit to secure a metal electrical junction box to a concrete block wall.
BOSCH

Bosch T3923SC 4 Inch SDS-Plus SpeedCore Thin Wall Core Bit Extension Heavy Duty 2 Piece Set For Masonry Concrete Drilling

In stock
SKU: T3923SC
$14.45 USD

Description

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Extend Your Drilling Reach with Bosch SpeedCore Innovation

Expand your drilling capabilities with the Bosch T3923SC 4-Inch SDS-plus SpeedCore Thin-Wall Core Bit Extension. Designed specifically to work seamlessly with smaller rotary hammers, this premium extension provides the extra reach required for deep masonry, brick, and concrete drilling applications. Whether you are a professional contractor routing plumbing lines or an electrician installing conduit through thick walls, this core bit extension ensures you can penetrate deeper without sacrificing stability or power transfer.

The Bosch SpeedCore system is engineered for maximum efficiency, easily accommodating a core body range from 1 inch up to 4-3/8 inches with a 3-inch usable cutting depth. The highly convenient two-piece design allows you to quickly and securely screw your thin-wall core bit directly onto the shank, minimizing downtime on the job site. Built for industrial durability and precise performance, this SDS-plus extension guarantees that your tough drilling tasks are completed faster and with cleaner results.

Key Features

  • Provides a crucial 4 inches of extra reach for deep masonry and concrete coring applications
  • Optimized for high-efficiency use with smaller SDS-plus rotary hammers
  • Convenient two-piece design allows the thin-wall core bit to screw directly onto the shank
  • Supports a versatile core body range from 1.0 inch up to 4.375 inches
  • Engineered to maintain heavy-duty power transfer for faster material removal

What's Included

  • (1) Bosch T3923SC 2-Piece 4 In. SDS-plus Thin-Wall Core Bit Extension

Specifications

Brand Name Bosch
MFG Part # (OEM) T3923SC
Product Type Core Bit Extension
Extension Length 4.0 in.
Chuck Fitment SDS-Plus
Bit Type Thin-Wall Core
Compatible Core Size Range 1.0 in. to 4.375 in.
Usable Cutting Depth 3.0 in.
Max RPM (Extended > 8 in.) 600 RPM
Piece Count 2
Material Heavy-Duty Steel

Pro-Tip: When using core bit extensions that push your total bit length past 8 inches, always regulate your rotary hammer's speed to stay below 600 RPM. This prevents excessive wobbling, protects the bit from binding, and ensures a cleaner, more accurate hole in your masonry materials.