A studio shot of the white 4-inch Bosch HBT400 bi-metal hole saw, showing its Progressor tooth design and triangle plug removal slots.
An informational graphic of the Bosch bi-metal hole saw with callouts pointing to key features: "TRIANGLE SLOT DESIGN," "ENHANCED M42 ALLOY," "PROGRESSOR TOOTH DESIGN," "REINFORCED SHOULDERS," and "DEEPER CUP."
A gloved hand uses a Bosch drill with an auxiliary handle and a white bi-metal hole saw to drill a hole in the side of a metal electrical panel.
A person wearing work gloves is shown inserting the arbor of a Bosch bi-metal hole saw into the chuck of a cordless drill.
A close-up view of the Progressor tooth design on the Bosch bi-metal hole saw, showing the alternating sizes of the cutting teeth.
A Bosch drill with a white bi-metal hole saw is shown drilling a hole for a doorknob in a white, six-panel wooden door.
A person uses a Bosch drill with a white bi-metal hole saw to drill a hole through a white laminate countertop, with the wood plug resting nearby.
A gloved hand uses a Bosch drill with an auxiliary handle and a white bi-metal hole saw to drill a hole in the side of a metal electrical panel.
A studio shot of the white 4-inch Bosch HBT400 bi-metal hole saw, showing its Progressor tooth design and triangle plug removal slots.
An informational graphic of the Bosch bi-metal hole saw with callouts pointing to key features: "TRIANGLE SLOT DESIGN," "ENHANCED M42 ALLOY," "PROGRESSOR TOOTH DESIGN," "REINFORCED SHOULDERS," and "DEEPER CUP."
A gloved hand uses a Bosch drill with an auxiliary handle and a white bi-metal hole saw to drill a hole in the side of a metal electrical panel.
A person wearing work gloves is shown inserting the arbor of a Bosch bi-metal hole saw into the chuck of a cordless drill.
A close-up view of the Progressor tooth design on the Bosch bi-metal hole saw, showing the alternating sizes of the cutting teeth.
A Bosch drill with a white bi-metal hole saw is shown drilling a hole for a doorknob in a white, six-panel wooden door.
A person uses a Bosch drill with a white bi-metal hole saw to drill a hole through a white laminate countertop, with the wood plug resting nearby.
A gloved hand uses a Bosch drill with an auxiliary handle and a white bi-metal hole saw to drill a hole in the side of a metal electrical panel.
BOSCH

Bosch Hole Saw HBT400 4 Inch Bi-Metal M42 Cobalt Progressor Tooth (Triangle Slot Plug Removal 1.75 Inch Cutting Depth Wood Metal Plastic Drywall)

Only 1 left
SKU: HBT400
$16.99 USD
$33.79 USD Sale $16.99 USD

Description

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Bosch HBT400 4-Inch Bi-Metal M42 Cobalt Progressor Tooth Hole Saw

The Bosch HBT400 4-Inch Bi-Metal M42 Hole Saw is an industrial drilling accessory engineered for boring 4-inch clearance holes through sheet metal, stainless steel tubing, dimensional lumber, drywall panels, and PVC conduit. Formulated with an M42 bi-metal alloy containing 8% cobalt for heat resistance and 20% longer service life, this hole saw features a Progressor tooth geometry with alternating tooth sizes to accelerate cutting speeds. Outfitted with a deep 1.75-inch cup depth, reinforced cup shoulders, and triangular plug-removal slots, this accessory executes pipe penetrations for MEP contractors.

Best Used For:

  • Plumbing & HVAC Pipe Rough-Ins: Boring 4-inch diameter clearance holes through joists and subfloors for drain lines and ductwork.
  • Electrical Panel & Junction Box Penetrations: Cutting clean entry holes through sheet metal enclosures and plastic utility boxes.
  • Drywall & Wall Sheathing Layout: Drilling precise openings in drywall panels and exterior plywood sheathing for vent penetrations.

Key Performance & Safety Features

  • M42 Alloy with 8% Cobalt Content: Provides thermal endurance under heavy friction to extend cutter lifespan by 20% over standard bi-metal saws.
  • Progressor Alternating Tooth Geometry: Combines small and large tooth profiles to clear chips rapidly and maintain fast cutting speeds.
  • Triangular Plug-Removal Side Slots: Strategic side cutouts provide leverage points for fast plug ejection and heat dissipation.
  • Deep 1.75-Inch Cutting Cup: Allows single-pass drilling through 2x dimensional lumber and thick composite materials.
  • Reinforced Heavy-Duty Shoulder Base: Strengthened base plate reduces flex and prevents cup fracture under high rotational torque.

What's Included

  • (1) Bosch HBT400 4-Inch Bi-Metal M42 Hole Saw

Technical Specifications

Brand / Manufacturer Bosch Power Tools
Model / Part Number HBT400
Hole Saw Outer Diameter 4.0 in. (101.6 mm)
Maximum Cutting Depth 1.75 in. (44.45 mm)
Body Material Composition Bi-Metal M42 High-Speed Steel with 8% Cobalt
Cutting Tooth Geometry Progressor Alternating Pitch Tooth Pattern
Plug Ejection Mechanism Triangular Side Access Slots
Cup Base Construction Reinforced Steel Shoulder
Self-Feeding Mechanism No
Target Material Compatibility Wood, Structural Steel, Stainless Steel, Drywall, PVC, Plastics
Pro-Tip: Insert a flathead screwdriver into the triangular side slot and lever against the wood or metal plug to pop it out instantly; clearing the cup prevents heat buildup and maintains cutter speed on consecutive holes.