Bosch Diamond Hole Saw HDG4 4 Inch (Vacuum Brazed Segmented Tooth Wet Cutting Granite Porcelain Tile Glass Masonry Drilling)

Bosch HDG4 4 Inch Vacuum Brazed Diamond Grit Hole Saw

The Bosch HDG4 is a 4-inch diameter vacuum-brazed diamond grit hole saw engineered to execute smooth, chip-free wet core drilling through porcelain, granite, marble, slate, glass, and ceramic tile. Built with fused industrial diamond particles and segmented edge teeth, this heavy-duty masonry cutter lowers thermal friction and clears substrate debris to bore large utility openings without cracking hard stone surfaces. Featuring a 1-1/2-inch cutting depth capacity and side plug ejection slots, it integrates with Bosch Quick Change universal mandrel systems and standard power drills operating in wet mode to create clean plumbing pass-throughs and fixture mounting holes.

Best Used For:

• Granite & Marble Countertop Plumbing Openings: Coring clean 4-inch clearance holes through thick natural stone tops and vanity surfaces for drain lines and sink fixtures.
• Porcelain & Ceramic Tile Wall Pass-Throughs: Slicing accurate, chip-free circular cuts through dense floor or wall tiles for large shower valves and commercial piping.
• Glass Panel & Slate Masonry Core Drilling: Executing controlled, crack-free penetrations in glass sheets, mirror tiles, and slate slabs using water-cooled drilling setups.

Key Performance & Safety Features

• Vacuum-Brazed Diamond Edge: Fuses diamond particles directly to the steel core for high grit retention and extended cutting life in abrasive stone.
• Segmented Tooth Architecture: Edge tooth segments reduce surface friction and channel slurry away from the cut face for faster penetration.
• Quick Change Mandrel Fitment: Compatible with Bosch universal arbor systems for tool-free cup swaps and minimal jobsite downtime.
• Wet-Operation Thermal Control: Formulated for continuous water lubrication to dissipate cutting heat and prevent edge glazing.
• Core Plug Ejection Side Slots: Strategic side openings allow quick screwdriver access to push out trapped stone and tile plugs.
• 1-1/2-Inch Depth Reach: Barrel cup depth easily penetrates standard countertop slabs and floor tile assemblies in a single pass.

What's Included

• (1) Bosch HDG4 4-Inch Diamond Grit Hole Saw

Technical Specifications

Pro-Tip: Always operate this 4-inch diamond hole saw with continuous water coolant on a GFCI-protected drill circuit at low RPMs, starting the bit at a slight angle to score a groove before leveling off to prevent walking on slick tile.