Drill Bit Set Bosch HSS Twist Drill Bits Cobalt Sets

The Bosch HSS Twist Drill Bits Cobalt set contains cobalt-alloyed high-speed steel drill bits designed for drilling metal, including stainless and heat-resistant steels. Each bit is fully ground and manufactured to DIN 338 with a cylindrical shank equal to the drill diameter, providing consistent fit in drill chucks and stands. The 5% cobalt content, two-cutter geometry and two flutes ensure improved wear resistance, heat protection and efficient chip evacuation for longer tool life. The bits are Type N with a 135° split-point tip and diameter tolerance h8 for accurate centring and reduced walking.

Advantages

Five percent cobalt alloy and fully ground HSS deliver enhanced hardness and thermal stability compared with standard HSS, resulting in longer life when working with stainless and alloyed steels. The two-cutter design and two flutes accelerate chip removal and reduce clogging, while the split-point 135° tip provides active cutting and precise centring without wandering. Conformance to DIN 338 and cylindrical shanks ensure dimensional accuracy and compatibility with drill stands and hand-held drivers.

Suitable for

• Alloyed and non-alloyed steel
• Stainless steel and acid- and heat-resistant steels
• Cast iron and cast steel
• Use in drill stands and portable drill drivers

Key specifications

• Brand: Bosch
• MPN: 2607019924
• EAN: 3165140517041
• Standard: DIN 338
• Material: HSS with 5% cobalt
• Tip: 135° split-point (Type N)
• Shank: cylindrical, shank diameter = drill diameter
• Flutes/cutters: 2 flutes, 2 cutters
• Tolerance: h8

How to use

Secure the appropriate drill bit of the correct diameter in the drill chuck or drill stand so the cylindrical shank seats fully. Use a steady feed and appropriate cutting speed for the material—lower speeds for stainless and heat-resistant steels to limit heat build-up. Apply cutting fluid or lubricant when drilling stainless or alloyed steels to improve chip evacuation and reduce temperature. Clear chips frequently to avoid clogging the flutes and inspect bits for wear; replace when cutting becomes inefficient or edges are rounded.

Recommendations

For best results on stainless and heat-resistant steels, use reduced spindle speed, steady pressure, and a suitable coolant or cutting oil. When starting holes in smooth surfaces, consider a centre punch or small pilot hole to prevent walking.