Irwin 1877714 1/4″ High Speed Steel Black Oxide Countersink Drill Bit

The Irwin 1877714 1/4″ High Speed Steel Countersink Drill Bit is designed for creating clean, accurate countersunk holes for small flat-head fasteners in a variety of machinable materials. Manufactured from industrial-grade high speed steel, this countersink is built for precision work where control and accuracy are critical. The compact 1/4-inch diameter makes it well suited for lighter fastening tasks, detailed fabrication, and finish work.

This countersink features a precision ground 82-degree cutting angle, which matches the standard angle used for most flat-head screws in metal, wood, and plastic. A multi-flute cutting design helps reduce vibration and chatter, producing smoother results and improved control during operation. The black oxide finish provides added corrosion resistance while reducing friction during cutting. With a 1-17/32-inch overall length and a 1/4-inch round shank, the Irwin 1877714 is compatible with most handheld drills and drill presses, making it a practical choice for shop, jobsite, and maintenance use.

Irwin 1/4″ High Speed Steel Black Oxide Countersink Drill Bit At a Glance

• 1/4″ Countersink Diameter: Ideal for small flat-head fasteners
• 82° Cutting Angle: Matches standard fastener profiles for flush seating
• High Speed Steel Construction: Provides durability and consistent cutting performance
• Multi-Flute Design: Reduces vibration for smoother operation
• Black Oxide Finish: Improves corrosion resistance and cutting efficiency
• 1/4″ Round Shank: Fits most drills and drill presses
• Precision Ground Cutting Edges: Ensures clean, repeatable countersinks

Markets

• Metal Fabrication and Light Assembly: Used for preparing small fastener holes in steel and aluminum
• Woodworking and Finish Carpentry: Ideal for countersinking screws in trim and detail work
• Electronics and Precision Repair: Suitable for controlled countersinking on small components
• Maintenance and Facility Services: Supports general repair across mixed materials
• Automotive and Equipment Repair: Useful for brackets, panels, and light-duty fasteners
• Trade Schools and Educational Programs: Helps demonstrate proper countersinking techniques

Smaller fasteners still require accurate countersinking to ensure proper fit and a clean finished surface. The Irwin 1877714 countersink drill bit is designed to deliver controlled, precise results when working with light-duty fastening applications. Its 82-degree cutting angle aligns with common flat-head screws, helping reduce rework and improve overall appearance.

The high speed steel construction provides dependable cutting performance, while the black oxide finish helps extend tool life in shop and jobsite environments. With a standard 1/4-inch shank, this countersink works easily with handheld drills and drill presses, making it a convenient option for technicians, woodworkers, and maintenance crews who need reliable performance for detailed fastening tasks.

Irwin 1877714 1/4″ 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 1877714 1/4″ High Speed Steel Black Oxide Countersink Drill Bit Includes

• (1) 1/4″ High Speed Steel Countersink Drill Bit

Irwin 1877714 1/4″ High Speed Steel Black Oxide Countersink Drill Bit Specifications

• Diameter: 1/4 in.
• Cutting Angle: 82 Degrees
• Overall Length: 1-17/32 in.
• Shank Size: 1/4 in.
• Shank Type: Round
• Material: High Speed Steel
• Finish: Black Oxide

Why Customers Choose the Irwin 1/4″ High Speed Steel Black Oxide Countersink Drill Bit

Customers choose the Irwin 1877714 countersink drill bit for precise control when working with smaller fasteners and detailed assemblies. The high speed steel construction delivers consistent cutting performance, while the black oxide finish helps maintain durability during frequent use. Its 82-degree cutting angle aligns with standard flat-head screws, allowing fasteners to seat flush without additional finishing steps.

The compact 1/4-inch diameter supports accuracy in light-duty applications, and the standard 1/4-inch shank ensures compatibility with common drills. For installers, technicians, and woodworkers who need clean, repeatable countersinks in smaller sizes, this Irwin countersink is a practical and reliable choice.