Irwin 12411 Countersink Drill Bit 1/2 in 82 Deg Hss 5 Flute

Product Description

The IRWIN INDUSTRIAL TOOL CO 12411 is a 1/2-inch high speed steel countersink drill bit designed for fast, clean countersinking into a wide range of machinable materials. The tip is milled and precision ground to an 82-degree included angle, producing consistent, flush-seat results on each pass. A black oxide coating resists corrosion and reduces surface friction during cutting. Five flutes distribute cutting load evenly across the tool, minimizing chatter and vibration. The 1/4-inch round shank fits standard drill chucks and quick-change holders. This bit is suited for metalworking, fabrication, and general trade applications where accurate countersink geometry is required.

The 12411 countersink bit is used when fastener heads must sit flush or below the workpiece surface in metal, wood composites, and other machinable substrates. Typical applications include sheet metal fabrication, HVAC duct work assembly, electrical enclosure prep, and general mechanical assembly. The 82-degree angle matches the geometry of most standard flat-head machine screws used in trade and industrial settings. The bit is sold in a package of 5, making it practical for job-site stocking or toolbox replenishment.

Key Features

• 82-degree precision-ground tip angle matches standard flat-head fastener geometry
• High speed steel construction for durability across machinable materials
• Black oxide coating provides corrosion resistance and reduces cutting friction
• 5-flute design reduces vibration and chatter during use
• 1/4-inch round shank compatible with standard drill chucks and quick-change systems
• Package quantity of 5 units per order

Compatibility

Designed for use with standard 1/4-inch round shank drill chucks and quick-change bit holders. Suitable for countersinking into most machinable materials including metals, wood composites, and plastics.

Installation Notes

Installation and use of this countersink bit should be performed by qualified tradespeople familiar with rotary cutting tools. Secure the workpiece firmly before drilling, and ensure the drill chuck is fully tightened onto the 1/4-inch shank before operation. Use appropriate RPM settings for the material being countersunk — harder materials require lower speeds. Always wear eye protection when operating rotary cutting tools.