HSS-kierrep pora koboltti Bosch 2608585894

HSS Twist Drill Bits Cobalt Bosch 2608585894 are high-speed steel drill bits with 5% cobalt content, designed for durable performance when drilling stainless and alloyed steels. The bits are fully ground to provide good surface finish, wear resistance and heat protection. They feature two cutters and two flutes for efficient chip evacuation and a cylindrical shank matching the drill diameter for use in drill stands and drill drivers. Manufactured to DIN 338 as Type N with a 135° split-point tip and diameter tolerance h8, these bits are intended for precise centring and reduced wandering.

Advantages

These cobalt HSS twist drill bits deliver extended tool life and improved heat resistance due to the 5% cobalt alloy. Fully ground geometry and a 135° split point ensure accurate centring and reduced walking at the start of drilling. Two flutes and two cutting edges enable faster chip removal, lowering friction and wear during continuous use. Compliance with DIN 338 and h8 tolerance ensures consistent dimensions suitable for workshop and industrial applications.

Suitable for

• Drilling stainless steel
• Drilling alloyed and non-alloyed steels
• Drilling cast iron and cast steel
• Working with acid- and heat-resistant steels
• Use in drill stands and hand-held drill drivers

Key specifications

• Brand: Bosch
• MPN: 2608585894
• EAN: 3165140521291
• Material: HSS with 5% cobalt
• Standard: DIN 338
• Type: N (flute angle)
• Tip: 135° split-point
• Shank: cylindrical (shank diameter = drill diameter)
• Tolerance: h8

How to use

Secure the correct diameter bit in the chuck so the cylindrical shank seats fully. Use appropriate cutting speed and feed for the material being drilled—lower speeds for stainless and heat-resistant steels—to reduce heat build-up. Apply steady pressure and allow the flutes to clear chips frequently; withdraw the bit periodically for better chip evacuation when drilling deep holes. The split-point tip reduces the need for pilot holes by improving initial centring.

Recommendations

For best results when drilling stainless or heat-resistant steels, use cutting fluid or lubricant, maintain lower spindle speeds, and avoid excessive axial pressure. Inspect bits for wear and replace when the tip becomes blunt to maintain hole quality and prevent overheating.