Drill Bit DeWalt DT4909 cobalt HSS 6.5 mm, single pack

DeWalt DT4909 is a 6.5 mm cobalt HSS drill bit supplied as a single pack, engineered for drilling through hard metals. The combination of high-speed steel and cobalt alloy increases heat resistance and edge retention compared with standard HSS bits, making this drill bit suitable for demanding metalworking operations and industrial maintenance tasks where tool durability and consistent performance are required.

Advantages

The cobalt HSS composition offers improved hardness and thermal stability, reducing wear during prolonged drilling into stainless steel and other hard alloys. The 6.5 mm diameter provides a balance between rigidity and cutting speed for general metal drilling. As a single pack, the bit is convenient for replacements or stocking specific sizes for repair and maintenance kits. The bit is compatible with standard drill chucks and offers reliable concentricity for clean, accurate holes.

Suitable for

• Drilling stainless steel and hardened steel
• Industrial maintenance and machinery repair
• Metal fabrication and workshop tasks
• Repairing automotive components and construction fittings

Key specifications

• Material: cobalt-enhanced high-speed steel (HSS)
• Diameter: 6.5 mm
• Pack quantity: single piece
• Tip style: designed for metal cutting (split point geometry typical of HSS cobalt bits)
• Compatibility: fits standard keyed and keyless drill chucks

How to use

Secure the 6.5 mm cobalt HSS bit in the drill chuck and ensure it is tightened properly to prevent slippage. Mark the drilling point and, where possible, use a center punch to guide the bit. Start drilling at low speed to establish the hole, then increase speed as appropriate for the material while maintaining steady pressure. Use cutting fluid or coolant when drilling stainless steel and other heat-sensitive alloys to extend tool life and improve chip evacuation. After use, clean chips and residue from the bit and store it in a dry place to avoid corrosion.

Usage recommendations

For best results when drilling hard metals, use a lower drill speed, apply cutting fluid, and avoid excessive side pressure. Replace the bit if signs of significant wear or chipping appear to maintain hole quality and reduce risk of workpiece damage.