Auger drill bit DeWalt DT4638-QZ, length 380 mm, single piece

DeWalt DT4638-QZ auger drill bit, length 380 mm, single piece is designed for drilling deep, clean holes in timber and similar materials where extended reach and controlled feed are required. The bit combines a screw tip that provides steady penetration with a Lewis-style spiral flute for efficient chip removal. Peripheral cutting geometry reduces spalling and produces neat hole edges during through- and blind-hole woodworking operations.

Advantages

The auger bit features a self-feed screw tip for steady, hands-free progress and a dual cutting edge that enhances durability when encountering embedded fasteners. Hardened alloy steel construction extends service life under regular workshop and on-site use. The spiral groove shape maximizes chip transport to maintain cutting speed and reduce clogging, while the peripheral cutting design helps achieve clean hole walls and minimal tear-out.

Suitable for

• Drilling deep or long-reach holes in soft and hardwoods
• Joinery and timber framing tasks requiring precise, clean holes
• On-site construction and renovation where cordless or corded drills are used
• Installing bolts, dowels, and wooden pegs in structural and finish carpentry

Key specifications

• Overall length: 380 mm
• Type: auger (spiral) wood drill bit
• Tip: self-feed screw tip for controlled penetration
• Flute: Lewis-style spiral flute for efficient chip removal
• Cutting geometry: peripheral cutting edge for reduced spalling
• Material: hardened alloy steel for increased durability
• Quantity: single piece

How to use

Secure the DeWalt auger bit in a compatible drill chuck and ensure the screw tip is centered on the intended drilling point. Start drilling at low speed to engage the self-feed tip, then increase speed moderately while maintaining axial pressure. Allow the screw tip to draw the bit into the workpiece while periodically withdrawing to clear chips if drilling deep holes. Use appropriate clamping and support for the workpiece to prevent movement and reduce tear-out at exit points.

Usage recommendations

Use the auger bit with drills that deliver steady torque; for large-diameter or very deep holes consider intermittent withdrawal to remove chips and avoid overheating. Inspect the bit for damage after contact with nails or metal inclusions and replace if cutting edges are compromised.