Twist Drill Bits Cobalt Bosch 2608585895 HSS 5-Piece Set

Twist Drill Bits Cobalt Bosch 2608585895 HSS 5-Piece Set — a set of five HSS (high-speed steel) cobalt twist drill bits designed for precision metalworking. The bits contain 5% cobalt alloy and are fully ground to provide improved wear resistance, heat protection and consistent surface quality. Manufactured to DIN 338 with a cylindrical shank (shank diameter equals drill diameter) and h8 diameter tolerance, these drills are intended for use in drill stands and hand-held drill drivers. The Type N flute geometry with a 135° split point ensures accurate centring and reduces walking when starting holes.

Advantages

The cobalt alloy (5%) and fully ground HSS construction extend tool life and maintain cutting performance at elevated temperatures. Two flutes and two cutting edges enable fast chip evacuation, reducing heat build-up and wear. The 135° split-point tip provides immediate engagement and precise centring, while the cylinder shank allows secure clamping in standard chucks and drill stands. Compliance with DIN 338 ensures consistent dimensions and interchangeability.

Suitable for

• Alloyed and non-alloyed steel
• Stainless steel
• Cast iron and cast steel
• Acid- and heat-resistant steels

Key specifications

• Brand: Bosch
• MPN: 2608585895
• EAN: 3165140521307
• Material: HSS with 5% cobalt
• Standard: DIN 338
• Tip: 135° split point (Type N)
• Shank: cylindrical (shank = drill diameter)
• Tolerance: h8
• Set: 5 pieces

How to use

Secure the appropriate drill bit into the chuck so the cylindrical shank is fully clamped. Select a suitable spindle speed for the metal being drilled — lower speeds for stainless and hardened steels, higher speeds for softer steels and cast iron. Use cutting fluid or coolant when drilling stainless or heat-resistant steels to reduce friction and extend tool life. Apply steady pressure and avoid excessive feed that could overheat the bit; withdraw periodically to clear chips if necessary.

Usage recommendations

For best results when drilling stainless and acid-resistant steels, use a moderate speed with cutting fluid and allow the bit to cool between long drilling passes. Use a drill press for maximal accuracy and consistent centring; the 135° split point helps reduce walking, but a pilot hole or centre punch can further improve start-up precision.