Twist drill bit DeWalt DT4925-QZ | 4.1 mm diameter • 1 pc

DeWalt DT4925-QZ is a single twist drill bit with a 4.1 mm diameter designed for general-purpose drilling. The bit features standard spiral geometry and a three-sided shank to reduce slipping in the chuck. Supplied as a single piece, it is intended for use with portable or stationary drills and provides accurate 4.1 mm holes in compatible metals and other machinable materials.

Advantages

The drill bit is suitable for high-alloy steels and metals with tensile strength up to 1100 N/mm². A no-walk tip ensures easier initial penetration and helps maintain accurate positioning during start-up. Recessed cutting wings produce cleaner, burr-free holes, while the spin-proof three-sided shaft improves grip in standard drill chucks and reduces slippage under load.

Suitable for

• Portable drill and drill press operations
• Drilling high-alloy steels and metal components up to 1100 N/mm² tensile strength
• Creating precise 4.1 mm holes for fastening, assembly, or pilot holes

Key specifications

• Diameter: 4.1 mm
• Type: single twist drill bit
• Geometry: standard spiral (twist) flute
• Tip: no-walk (centering) tip for easier penetration
• Shank: three-sided, spin-proof design for improved chuck grip
• Supply quantity: 1 piece
• Recommended material capability: steels and metals with tensile strength up to 1100 N/mm²

How to use

Fit the 4.1 mm twist bit into a compatible drill chuck and tighten securely to engage the three-sided shank. Select an appropriate speed and feed rate for the material being drilled; lower speeds are generally recommended for high-alloy steels. Use steady pressure and allow the drill bit’s no-walk tip to locate the start point before applying full feed. Withdraw occasionally to clear chips and reduce heat build-up, and use cutting fluid when drilling harder metals to extend tool life and improve hole finish.

Usage recommendations

When drilling high-alloy steels, use suitable cutting lubricant and moderate drill speed to prevent work hardening and overheating. Ensure the drill chuck is compatible with a three-sided shank and inspect the bit before use for damage or wear to maintain clean, accurate, burr-free holes.