Irwin 12411 1/2″ High Speed Steel Black Oxide Countersink Drill Bit

The Irwin 12411 1/2″ High Speed Steel Countersink Drill Bit is designed for creating clean, precise countersunk holes in a wide range of machinable materials. Manufactured from industrial-grade high speed steel, this countersink bit is built to handle repeated use in metalworking, woodworking, and general fabrication tasks. Its 1/2-inch diameter and precision ground cutting edges provide consistent results when preparing holes for flat-head screws and fasteners.

This countersink features an 82-degree cutting angle, which is the standard angle used for most flat-head fasteners in metal, wood, and plastic applications. A five-flute design helps reduce vibration during operation, producing smoother cuts and improved control while extending tool life. The black oxide finish adds corrosion resistance and reduces friction, allowing for more controlled cutting and longer service life. With a 15/32-inch flute length, 1-21/32-inch overall length, and a 1/4-inch round shank, this countersink fits most handheld drills and drill presses, making it a practical option for shop or jobsite use.

Irwin 1/2″ High Speed Steel Black Oxide Countersink Drill Bit At a Glance

• 1/2″ Countersink Diameter: Provides proper clearance for flat-head fasteners
• 82° Cutting Angle: Matches standard fastener angles for clean seating
• High Speed Steel Construction: Built for durability and consistent cutting performance
• Five-Flute Design: Reduces vibration for smoother operation and extended tool life
• Black Oxide Finish: Improves corrosion resistance and cutting efficiency
• 1/4″ Round Shank: Fits most handheld drills and drill presses
• Precision Ground Edges: Ensures accurate and repeatable countersinking results

Markets

• Metal Fabrication Shops: Used for preparing fastener holes in steel, aluminum, and soft metals
• Construction and Renovation: Ideal for countersinking screws in framing, finish work, and hardware installation
• Woodworking and Cabinet Shops: Provides clean screw seating in hardwoods, softwoods, and composite materials
• Automotive and Equipment Repair: Useful for flush fastener installation on brackets, panels, and fixtures
• Maintenance and Facility Services: Supports general repair and installation tasks across multiple materials
• Trade Schools and Educational Programs: Suitable for teaching proper drilling and countersinking techniques

Fabricators, contractors, and maintenance crews rely on consistent countersinking results to ensure fasteners sit flush and finished surfaces remain clean. The Irwin 12411 countersink drill bit delivers reliable performance across metal, wood, and plastic, making it a versatile addition to any tool setup. Its 82-degree cutting angle aligns with common flat-head screws, reducing rework and improving overall job quality.

The five-flute design minimizes chatter during operation, which helps users maintain control and achieve smoother results, even when working in harder materials. For shops and field technicians who switch between handheld drills and drill presses, the 1/4-inch round shank provides easy compatibility without additional adapters. From fabrication benches to jobsite installations, this countersink offers dependable results in everyday drilling applications.

Irwin 12411 1/2″ High Speed Steel Black Oxide Countersink Drill Bit Features

• Industrial-Grade High Speed Steel: Provides strength and wear resistance for repeated use
• Precision Ground 82° Tip: Designed for standard flat-head fastener applications
• Five-Flute Cutting Geometry: Reduces vibration and improves cut quality
• Black Oxide Coating: Helps resist corrosion and reduce friction during cutting
• Machinable Material Compatibility: Suitable for iron, steel, soft metals, plastics, and wood

Irwin 12411 1/2″ High Speed Steel Black Oxide Countersink Drill Bit Includes

• (1) 1/2″ High Speed Steel Countersink Drill Bit

Irwin 12411 1/2″ High Speed Steel Black Oxide Countersink Drill Bit Specifications

• Diameter: 1/2 in.
• Cutting Angle: 82 Degrees
• Flute Length: 15/32 in.
• Overall Length: 1-21/32 in.
• Shank Size: 1/4 in.
• Shank Type: Round
• Material: High Speed Steel
• Finish: Black Oxide

Why Customers Choose the Irwin 1/2″ High Speed Steel Black Oxide Countersink Drill Bit

Customers choose the Irwin 12411 countersink drill bit because it delivers consistent, clean countersinks across multiple materials without excessive vibration or chatter. The high speed steel construction holds up under frequent use, making it a dependable option for metal fabrication, woodworking, and general repair work. Its 82-degree cutting angle aligns with common flat-head screws, helping installers achieve flush fastener seating without additional finishing steps.

For technicians and contractors working with handheld drills or drill presses, the 1/4-inch round shank ensures broad compatibility and quick setup. The five-flute design improves control and surface finish, reducing the risk of uneven cuts. Combined with a black oxide finish for added durability, this countersink is a practical choice for users who need reliable performance in everyday drilling and fastening tasks.