Twist Drill Bits Bosch HSS Cobalt 2608585900 5 Piece Set

Twist Drill Bits Bosch HSS Cobalt 2608585900 5 Piece Set delivers durable drilling performance in stainless and alloyed steels. Made from fully ground high-speed steel with 5% cobalt, these HSS cobalt drill bits are designed for extended lifetime, improved wear resistance and better heat protection. The set includes multiple sizes with cylindrical shanks and is produced to DIN 338 specifications; each bit features a split-point tip with a 135° angle and h8 diameter tolerance for precise centring and reduced wandering.

Advantages

HSS Cobalt construction (5% Co) increases hardness and thermal stability compared with standard HSS, extending tool life during drilling in stainless steel and other hard materials. Fully ground flutes and two cutting edges ensure smooth cutting action and good surface finish, while two flutes provide efficient chip evacuation. The cylindrical shank allows use in drill stands and handheld drill drivers, and compliance with DIN 338 guarantees consistent geometry and tolerance.

Suitable for

• Alloyed and non-alloyed steels
• Stainless steel and acid- or heat-resistant steels
• Cast iron and cast steel
• General metalworking and workshop drilling tasks

Key specifications

• Manufacturer: Bosch
• MPN: 2608585900
• EAN: 3165140521352
• Material: HSS with 5% cobalt
• Standard: DIN 338
• Tip: Split-point 135°
• Flutes: 2 cutters, 2 flutes
• Shank: Cylindrical (shank = drill diameter)
• Tolerance: h8
• Set: 5 pieces (various diameters)

How to use

Select the correct drill diameter for the required hole. Secure the workpiece and use appropriate clamping. Fit the drill bit into the drill chuck ensuring the cylindrical shank seats fully. Start drilling at low speed to establish the centre with the split-point tip, then increase speed within the recommended range for stainless or alloyed steels. Use steady, moderate feed pressure and withdraw periodically to clear chips. Apply cutting fluid or coolant when drilling hard or heat-sensitive metals to reduce heat build-up and prolong bit life.

Recommendations

For best results when drilling stainless and alloyed steels: use cutting fluid, moderate speeds, and avoid excessive axial force. Replace worn bits to maintain hole quality and dimensional accuracy.