Milwaukee Tool 48-17-4035 Core Bit Extension 12 Inches

Product Description

The MILWAUKEE TOOL 48-17-4035 is a 12-inch extension designed for use with 3-1/2 inch core bits threaded to the 1-1/4-11 standard. It extends reach during core drilling operations, allowing tradespeople to drill through thicker concrete, masonry, or block without stopping to reposition. The overall length of 12 inches adds significant depth capacity to standard core bit setups. Compatible with threaded drill shanks, this extension connects between the drill motor and the core bit using the 1-1/4-11 thread standard common in heavy-duty wet and dry core drilling rigs. Licensed contractors and concrete drilling specialists are the primary installers.

This extension is suited for commercial and residential concrete core drilling applications where standard bit length is insufficient. Typical use cases include drilling through thick foundation walls, concrete floors, and CMU block for conduit, pipe, or anchor sleeve penetrations. Electricians, plumbers, and general contractors running core drills for through-penetrations will find this extension applicable wherever added depth is required and 1-1/4-11 threaded equipment is in use.

Key Features

• 12-inch overall length extends core bit reach for deep penetration applications
• 1-1/4-11 threaded connection matches standard heavy-duty core bit and drill motor interfaces
• Designed for use with 3-1/2 inch diameter core bits
• Compatible with threaded drill shanks for secure bit-to-motor connection
• Straight extension — no angled head, maintaining axial alignment during drilling

Compatibility

Compatible with 3-1/2 inch core bits and threaded drill shanks using the 1-1/4-11 thread standard. Designed as an OEM-style extension for core drilling rigs equipped with 1-1/4-11 threaded spindles.

Installation Notes

Installation should be performed by a qualified tradesperson familiar with core drilling equipment. Ensure the drill motor is fully powered down and locked out before attaching or removing the extension. Thread the extension fully onto the drill spindle and core bit using proper hand engagement before operating the drill under load. Follow applicable OSHA and site safety guidelines when operating core drilling equipment near electrical, plumbing, or structural elements.