Bosch Hole Saw HTW118 1-1/8 Inch Diameter Edge Impact Tough Core Bit (8 TPI 1/4 Hex Shank Depth Stop Pilot Spring Sheet Metal Ductwork Boring)

Bosch HTW118 1-1/8" Edge™ Impact Tough™ Bi-Metal Sheet Metal Hole Saw with 1/4" Hex Shank

The Bosch HTW118 1-1/8-inch Edge™ Impact Tough™ bi-metal hole saw cuts clean, burr-free knockouts and conduit penetrations through thin sheet metal, galvanized ductwork, steel junction boxes, and automotive body panels. Engineered with an optimized 8 TPI bi-metal tooth geometry and heat-treated alloy construction, this impact-rated core bit delivers up to 2X longer service life under high-torque rotational forces compared to standard hole cutters. Outfitted with an integrated one-piece design featuring a 1/4-inch quick-change hex shank, a built-in safety depth stop collar, and a spring-loaded pilot bit for automatic metal plug ejection, it equips HVAC technicians, residential electricians, and sheet metal fabricators with fast, non-binding hole-making efficiency.

Best Used For:

• Electrical Panel and Junction Box Knockouts: Drilling precision 1-1/8-inch holes to run 3/4-inch EMT conduit fittings and cable connectors through breaker boxes and steel enclosures.
• HVAC Sheet Metal and Spiral Ductwork Penetrations: Cutting clean round entry ports for damper rods, test probes, and sensor lines in galvanized duct assemblies without tooth binding.
• Automotive and Equipment Metal Enclosure Modification: Boring accurate holes in thin-gauge body panels, control consoles, and industrial metal cabinets with depth-stop safety.

Key Performance & Safety Features

• Edge™ Impact Tough™ Durability: Heat-treated bi-metal tooth construction withstands high rotational impact driver torque, delivering 2X longer service life.
• Optimized 8 TPI Fine Pitch: Precision-ground tooth profile prevents snagging and tooth stripping when slicing through thin sheet metal substrates.
• Integrated Solid Depth Stop: Built-in shoulder collar prevents accidental tool over-penetration, protecting underlying wiring and sensitive mechanical components.
• Automatic Spring Plug Ejection: Heavy-duty compression spring surrounding the pilot bit automatically pops out hot metal slugs immediately upon breakthrough.
• Universal 1/4-Inch Hex Shank: Quick-change power groove locks securely into high-torque impact drivers, right-angle drills, and standard drill chucks without slipping.
• One-Piece Integrated Construction: Eliminates separate arbors, mandrels, and loose set-screws, streamlining setup and preventing rotational wobble.

What's Included

• (1) Bosch HTW118 1-1/8" Edge™ Impact Tough™ Bi-Metal Sheet Metal Hole Saw with Integrated 1/4" Hex Shank & Pilot Bit

Technical Specifications

Pro-Tip: Run your cordless impact driver or drill at medium RPM when cutting thin electrical panels; letting the 8 TPI teeth shave the metal smoothly rather than forcing high downward pressure maximizes tooth sharpness and prevents burr formation on the backside of the cut.