Twist Drill Bits Bosch HSS Cobalt 2608585905 5 Piece Set

Twist Drill Bits Bosch HSS Cobalt 2608585905 — a set of five precision-ground HSS cobalt twist drills designed for high-performance metalworking. Each bit contains 5% cobalt alloy and is made to DIN 338, providing improved wear resistance and heat protection for drilling alloyed and non-alloyed steel, stainless steel, cast iron, cast steel and acid- and heat-resistant steels. The bits feature a cylindrical shank (shank diameter equals drill diameter), two cutters and two flutes for efficient chip removal, a split-point tip with a 135° angle for accurate centring and reduced wandering, and diameter tolerance h8.

Advantages

The cobalt alloy (5%) combined with fully ground high-speed steel increases tool life and maintains surface quality under high temperatures. Two cutters and two flutes ensure rapid chip evacuation to reduce clogging and wear. The 135° split-point tip provides active cutting and precise centring without wandering, while the cylindrical shank makes the bits suitable for use in drill stands and hand-held drill drivers. Manufactured to DIN 338 for consistent dimensions and performance.

Suitable for

• Drilling stainless steel and acid- or heat-resistant steels
• Drilling alloyed and non-alloyed steels
• Working with cast iron and cast steel
• General metal fabrication and maintenance tasks

Key specifications

• Brand: Bosch
• Model / MPN: 2608585905
• EAN: 3165140521406
• Set: 5-piece
• Material: HSS with 5% cobalt
• Standard: DIN 338
• Tip: Split-point, 135°
• Flutes / cutters: 2 flutes, 2 cutters
• Shank: Cylindrical (shank = drill diameter)
• Diameter tolerance: h8

How to use

Select the appropriate drill bit size from the set for the required hole diameter. Secure the workpiece and, when possible, use a drill stand for increased accuracy. Fit the cylindrical shank into the chuck of a drill driver or drill press and tighten securely. For best results on stainless and heat-resistant steels, use moderate feed and cutting speeds suited to HSS-cobalt drills, apply cutting lubricant when necessary, and clear chips regularly to avoid overheating and premature wear.

Usage recommendations

Use cutting fluid when drilling stainless or heat-resistant steels, maintain steady feed without excessive pressure, and periodically withdraw the bit to clear chips. Store the bits dry and protected to prevent corrosion and preserve tip sharpness.