Twist drill bit DeWalt DT4906, right-hand rotation, 1 pc, blister pack

DeWalt DT4906 twist drill bit is a single-piece, right-hand rotation drill designed for general-purpose metalworking. Supplied in a blister pack, this compact 1 pc bit is intended for portable or stationary drilling tasks in a variety of high-alloy steels and metals with tensile strengths up to 1100 N/mm². Its geometry and material composition prioritise durability, precise entry and efficient chip evacuation for cleaner holes and extended service life.

Advantages

The drill bit contains 5% cobalt for improved hardness and heat resistance, yielding substantially longer life compared with standard HSS-R bits. A no-walk tip provides accurate penetration and minimizes walking on start, while recessed cutting wings help produce burr-free holes. The three-sided no-slip shank ensures a secure grip in the chuck for sizes from 5 mm and above, and an enlarged central core toward the chuck increases fracture stability during freehand work. Optimised tip and flute geometry increases penetration speed and removes chips more effectively, reducing heat build-up during drilling.

Suitable for

• Drilling heat- and acid-resistant steels, stainless and chrome-nickel steels
• Working with cast iron, bronze and welded seams
• Portable and stationary drilling operations on high-alloy metals up to 1100 N/mm² tensile strength
• Applications requiring precise, burr-free holes and reduced bit walk

Key specifications

• Right-hand rotation single-piece twist drill geometry
• Cobalt alloy composition (5% Co) for increased wear and heat resistance
• No-walk tip design for accurate surface penetration (effective from 5 mm)
• Recessed cutting wings to reduce burr formation
• Spin-proof three-sided shank for improved chuck grip (from 5 mm)
• Reinforced central core increasing toward the chuck for fracture stability (from ~4.8 mm)
• Optimised flute and tip geometry for faster penetration and improved chip evacuation

How to use

Select a drill and chuck compatible with the bit diameter, secure the bit firmly in the chuck so the three-sided shank engages correctly, and set the drill to right-hand rotation. Begin drilling with moderate pressure to allow the no-walk tip to locate and penetrate the surface cleanly. Use steady feed and appropriate rotational speed for the material being drilled; higher speeds increase heat, so moderate speeds are recommended for hard, high-alloy steels. Withdraw periodically to clear chips when drilling deep holes and allow the bit to cool if it becomes hot.

Usage recommendations

Use cutting fluid or appropriate coolant when drilling stainless, high-alloy or heat-resistant steels to reduce heat and extend bit life. For best results, start holes with correct speed and pressure, back out chips regularly in deep holes, and avoid excessive side load or bending forces to maintain drill integrity.