Drill bit DeWalt DT5556 9.5 mm HSS Extreme

DeWalt DT5556 is a 9.5 mm high-speed steel (HSS) twist drill bit from the Extreme series, designed for general metalworking and common drilling tasks. The bit combines a reliable HSS cutting geometry with a standard straight shank to fit most hand drills and drill presses. It is intended for accurate through-holes and pilot holes in a variety of ferrous and non-ferrous metals and for routine workshop, maintenance and construction use where HSS performance is needed.

Advantages

The HSS material offers good hardness and heat resistance for sustained cutting performance on metal. The Extreme series geometry promotes efficient chip evacuation and consistent drill tracking, reducing walking and improving hole quality. The standard shank design provides secure clamping in chucks and compatibility with a wide range of drilling tools. Overall, the bit delivers predictable drilling characteristics and long service life under typical metal drilling conditions.

Suitable for

• Drilling holes in steel and iron alloys
• Working with non-ferrous metals such as aluminum and brass
• General workshop and maintenance drilling tasks
• Use in hand drills and drill presses for routine metal drilling

Key specifications

• Diameter: 9.5 mm
• Material: High-speed steel (HSS)
• Type: Twist drill bit
• Shank: Standard straight shank for chuck mounting
• Series: Extreme line with optimized cutting geometry

How to use

Secure the drill bit in the chuck so that the shank is clean and gripped firmly. Select a drill speed appropriate for metal drilling—lower speeds for harder materials and higher speeds for softer metals—while applying steady axial pressure. Use cutting fluid or lubricant when drilling harder alloys or when prolonged cutting generates heat to extend tool life and improve hole finish. After drilling, retract the bit periodically to clear chips and prevent clogging.

Usage recommendations

For best results, match drill speed and feed rate to the material being drilled and use appropriate cutting fluid. Inspect the bit for wear and resharpen or replace when the cutting edges are dull to maintain clean hole quality and safe operation.