Drill Bit Bosch 4.0 mm HSS (model 2609255942)

Bosch 4.0 mm HSS drill bit is a high-speed steel cutting tool engineered for drilling precise 4.0 mm diameter holes. Designed for use with handheld electric drills and drill presses, this drill bit delivers consistent, repeatable results when working with a variety of common metals and general-purpose materials. The compact, straight-shank design fits standard chucks and supports accurate positioning for both single-hole and production tasks.

Advantages

The HSS material ensures good wear resistance and heat tolerance during typical drilling operations in mild steel, stainless steel, and non-ferrous metals. Its ground tip and flute geometry promote controlled chip evacuation and reduce walking at the start of drilling, improving hole quality and dimensional accuracy. The standard straight shank provides secure clamping in most chucks, enabling stable rotation and reduced runout.

Suitable for

• Drilling 4.0 mm holes in sheet metal and thin-walled components
• General workshop tasks using handheld drills or drill presses
• Prototyping and small-series production where repeatable hole size is needed
• Working with mild steel, stainless steel, aluminum and other common metals

Key specifications

• Diameter: 4.0 mm
• Material: High-speed steel (HSS)
• Shank type: Straight shank for standard chucks
• Tip geometry: Ground point for reduced walking and improved centering
• Typical use: Metalworking and general-purpose drilling

How to use

Mark the drilling point and secure the workpiece to prevent movement. Select an appropriate clamping method and insert the straight shank firmly into the drill chuck, tightening to minimize runout. Start at low speed to establish the hole, then increase speed as appropriate for the material being drilled. Apply steady feed pressure, withdraw the bit periodically to clear chips, and use cutting fluid when drilling harder metals to reduce heat and extend tool life.

Usage recommendations

Use the Bosch 4.0 mm HSS drill bit with a suitable cutting lubricant when working with stainless steel or other hard alloys. Replace the bit when wear degrades hole accuracy or when chipping appears on the cutting edges. Store in a dry place to prevent corrosion and keep the shank clean for reliable chuck gripping.