Twist Drill Bits Bosch HSS Cobalt 2608585901 5-10mm

Twist Drill Bits Bosch HSS Cobalt 2608585901 5-10mm are high-speed steel (HSS) twist drills with 5% cobalt content, made for reliable, long-life metal drilling. Fully ground flutes and a split-point tip provide accurate centring and lower friction, while the cobalt alloy increases wear and heat resistance. Manufactured to DIN 338, these bits have cylindrical shanks and are suitable for use in drill stands and hand-held drill drivers.

Advantages

Contains 5% cobalt alloy and is fully ground for improved surface finish, extended lifetime and better heat protection compared to standard HSS bits. The two-flute design ensures efficient chip evacuation, while the 135° split-point tip reduces wandering and enables active cutting from the first contact. Manufactured to DIN 338 with diameter tolerance h8 for precision fits.

Suitable for

• Alloyed and non-alloyed steel
• Stainless steel
• Cast iron and cast steel
• Acid- and heat-resistant steels
• Use in drill stands and hand-held drill drivers

Key specifications

• Brand: Bosch
• MPN: 2608585901
• EAN: 3165140521369
• Material: HSS with 5% cobalt
• Standard: DIN 338
• Tip: 135° split-point (Type N flute angle)
• Shank: cylindrical (shank = drill diameter)
• Diameter tolerance: h8
• Diameter range: 5–10 mm

How to use

Mark the drilling position and secure the workpiece. Select the correct diameter and install the bit in a drill stand or a drill driver with a suitable chuck. Start at a low speed to establish the centre, then increase speed according to material hardness. Apply steady feed pressure and allow chips to evacuate through the flutes; retract occasionally for deep holes. Use cutting fluid when drilling stainless or heat-resistant steels to reduce heat and extend bit life.

Usage recommendations

For best results, use coolant when drilling stainless and heat-resistant steels, avoid excessive speed to prevent overheating, and replace bits showing significant wear or chipping. Match drill speed and feed to material hardness and thickness for optimal lifetime and hole quality.