Irwin 1882630 7/64″ #4 Wood Tapered Countersink

Irwin 1882630 #4 Wood Tapered Countersink Drill Bit with Adjustable Counterbore

The Irwin 1882630 #4 Wood Tapered Countersink is designed for drilling clean, accurate pilot holes and producing smooth countersinks in wood applications. Built around a tapered high-speed steel drill bit, this tool matches the natural taper of wood screws to reduce splitting and improve holding power. Widened flutes help clear chips quickly, allowing faster drilling while maintaining clean hole walls in softwood, hardwood, plywood, and composite materials. The bit diameter is sized specifically for #4 screws, making it a dependable choice for cabinetry, trim work, furniture assembly, and general carpentry.

This countersink features an adjustable four-cutter counterbore that cuts evenly and clears material efficiently for smooth, consistent screw seating. The counterbore mounts securely to the flats on the shank using two hex screws, allowing controlled adjustment of pilot hole depth based on screw length and project requirements. A 1/4-inch quick-change hex shank reduces slipping in standard chucks and provides compatibility with all 1/4-inch quick-change systems, including impact drivers. With a compact 4-inch overall length and durable construction, this bit is suited for both shop work and on-site installation where speed and repeatable results matter.

Irwin #4 Wood Tapered Countersink At a Glance

• Tapered Drill Design: Matches wood screw taper to reduce splitting and improve fastener grip
• Widened Flutes: Clear chips quickly for faster, cleaner pilot hole drilling
• 4-Cutter Counterbore: Cuts smooth, even countersinks while clearing debris efficiently
• Adjustable Depth: Counterbore position adjusts for precise pilot hole control
• Secure Mounting: Counterbore attaches to shank flats with dual hex screws
• 1/4″ Quick-Change Shank: Reduces slipping in standard chucks
• Impact Driver Compatible: Works with all 1/4″ quick-change chucks
• High-Speed Steel Construction: Built for durability in wood applications

Markets

• Carpentry and Framing: Used for accurate pilot holes and countersinks in structural and finish work
• Cabinet and Furniture Making: Supports clean screw seating in visible wood surfaces
• Trim and Finish Installers: Helps achieve flush or recessed fasteners in molding and millwork
• Maintenance and Repair Crews: Reliable for everyday wood fastening tasks
• Construction and Renovation: Suitable for on-site drilling with drills or impact drivers
• Trade Schools and Training Programs: Useful for teaching proper pilot hole and countersink techniques

Carpenters and finish installers rely on tapered countersink bits to achieve consistent results when fastening wood components, and this model supports that need with controlled drilling and smooth countersinking in a single setup. The adjustable counterbore allows crews to dial in the correct depth for different screw lengths, reducing rework and improving surface appearance on finished projects.

Contractors working on cabinets, trim, or furniture benefit from the quick-change shank, which speeds bit changes and maintains a solid grip in both drills and impact drivers. Maintenance teams and remodelers appreciate the chip-clearing design that keeps drilling efficient during repetitive tasks. Whether used in a workshop or on a jobsite, this countersink supports clean fastening and dependable performance across a wide range of wood applications.

Irwin 1882630 7/64″ #4 Wood Tapered Countersink Features

• High-Speed Steel Drill Bit: Provides strength and wear resistance for wood drilling
• Tapered Pilot Hole Geometry: Matches screw profile for improved holding power
• Four-Cutter Counterbore: Produces smooth, even countersinks
• Adjustable Counterbore Assembly: Allows precise depth control
• Dual Hex Screw Attachment: Keeps counterbore securely mounted
• Quick-Change Hex Shank: Compatible with standard and impact tools

Irwin 1882630 7/64″ #4 Wood Tapered Countersink Includes

• (1) #4 Tapered Drill Bit
• (1) Adjustable 4-Cutter Counterbore
• (2) Hex Screws for Counterbore Attachment

Irwin 1882630 7/64″ #4 Wood Tapered Countersink Specifications

• Product Number: 1882630
• Screw Size: #4
• Bit Diameter: 7/64 in
• Bit Length: 4 in
• Counterbore Size: 1/4 in
• Plug Size: 1/4 in
• Shank Size: 1/4 in
• Shank Type: Hex
• Material: High-Speed Steel
• For Use On Wood: Yes
• For Use On Metal: No
• Quick Change: Yes
• Package Quantity: (1) Individual Bit

Why Customers Choose the Irwin #4 Wood Tapered Countersink

Woodworkers and installers choose the Irwin 1882630 because it combines pilot drilling and countersinking into one adjustable setup that saves time and improves consistency. The tapered drill bit supports proper screw fit, helping reduce splitting and providing a stronger hold in wood assemblies. The four-cutter counterbore delivers smooth, even recesses so screws sit flush or below the surface, which is critical for trim, cabinetry, and furniture projects.

Crews working with cordless drills and impact drivers value the 1/4-inch quick-change shank, which keeps the bit secure and speeds tool changes on the jobsite. For repetitive fastening tasks where accuracy and surface finish matter, this wood countersink delivers dependable results with controlled depth and clean hole quality.