Twist metal drill bit Bosch HSS-Co DIN 338 — 3 mm, single piece

Bosch HSS-Co DIN 338 twist metal drill bit, diameter 3 mm, single piece, designed for drilling through and blind holes in a variety of metals. Made from high-speed steel with cobalt (HSS-Co) for improved heat resistance and wear performance, this twist drill complies with DIN 338 dimensions and geometry. The bit is compatible with hand drills, drill presses and pillar drills and is intended for metalworking, maintenance and repair tasks where precise, durable drilling is required.

Advantages

The cobalt-alloy HSS-Co composition increases red-hardness and cutting-edge stability, allowing sustained performance when drilling alloyed and non-alloyed steels up to 1000 N/mm², stainless steels (V2A/V4A), cast iron and heat- or acid-resistant steels. The DIN 338 geometry provides accurate centring and efficient chip evacuation while reducing heat build-up. Supplied as a single 3 mm bit, it is suitable for both manual and machine-mounted use and offers consistent concentricity for precise hole tolerances.

Suitable for

• Drilling holes in alloyed and non-alloyed steel up to 1000 N/mm²
• Working with stainless steel grades (V2A/V4A)
• Drilling in cast iron and cast steel
• Maintenance, repair and general metal fabrication tasks
• Use in hand drills, drill presses and pillar drills

Key specifications

• Drill type: Twist drill bit with DIN 338 geometry
• Material: High-speed steel with cobalt alloy (HSS-Co)
• Diameter: 3 mm
• Quantity: Single piece
• Application: Through and blind holes in various metals
• Compatibility: Suitable for hand drills and drill stands/pillar drills

How to use

Secure the workpiece and, where possible, use a centre punch to mark the drill point. Fit the 3 mm Bosch HSS-Co drill bit into the chuck and tighten firmly. Select an appropriate cutting speed and feed for the material—lower speeds for stainless and high-strength steels and medium speeds for mild steel and cast iron. Apply steady pressure without excessive force; periodically withdraw the bit to clear chips and reduce heat. For through holes, ensure backing material is placed to prevent burrs on exit.

Usage recommendations

Use cutting fluid or lubricant when drilling stainless or high-strength steels to extend tool life and improve chip evacuation. For highest performance requirements, consider Topline variants; for professional general use, the standard HSS-Co quality provides reliable results.