Guide Plate for 3" Thick Wall Core Bit

The Milwaukee Guide Plate for 3" Thick Wall Core Bit is a centering and stabilization accessory used with SDS-Max and Spline thick-wall core drilling systems. Its main purpose is to ensure the core bit starts straight, accurate, and controlled before full cutting begins.

What it does

This guide plate is part of the 3-piece thick-wall coring system:

• Core bit body
• Centering pin
• Guide plate (this part)

Together, they:

• Keep the bit from walking on concrete at startup
• Help establish a clean, centered hole
• Improve accuracy and hole alignment
• Reduce operator correction during initial drilling

How it works on site

1. Place the guide plate against the wall or slab
2. Insert the centering pin through the core bit
3. Start drilling with controlled pressure
4. The plate keeps the bit centered during initial engagement
5. Once stable, the core bit continues cutting without wandering

Why it matters

Without a guide plate, a 3" core bit can:

• Skid across smooth concrete
• Start off-center
• Create oversized or damaged entry holes

The guide plate prevents that by giving the bit a physical starting boundary.

Compatibility

Designed for Milwaukee thick-wall core systems, including:

• SDS-Max core bit systems
• Spline core bit systems
• 3" thick-wall core bodies (48-20-5145 series family)
  

Works with:

• Guide plate + centering pin kits
• SDS-Max or Spline adapter shanks
• Thick-wall core bit assemblies

Ideal For

• Electrical conduit penetrations
• Plumbing and HVAC wall openings
• Block, brick, and concrete walls
• Anchor sleeve and pass-through holes
• Any 3" coring application needing precision starts