HSS Twist Drill Bit Bosch 2608585934 — high-speed steel, ground, standard point

HSS Twist Drill Bit Ground by Bosch is a precision ground high-speed steel drill designed for accurate metal drilling. The 135° self-centring split-point tip reduces wandering and allows drilling without pre-punching or pilot holes up to 10 mm. With ground flutes and Type N geometry, this drill delivers stable cutting, improved chip evacuation and is suitable for use in drill stands and hand-held drill drivers for workshop and maintenance tasks.

Advantages

The ground HSS construction enables up to 40% faster drilling and up to 50% lower feed pressure compared with standard-ground HSS drills with chisel edges. The 135° split-point provides immediate centring and reduces the need for pilot holes, while precision-ground flutes improve chip removal and dimensional accuracy. The cylindrical shank matches the drill diameter for secure clamping in chucks and stands.

Suitable for

• Drilling holes in alloyed and non-alloyed steel
• Working with cast steel, cast iron and sintered iron
• Machining malleable cast iron and non‑ferrous metals
• Drilling hard plastics for assembly and maintenance
• Use in drill stands and hand-held drill drivers

When it may not be suitable

The drill is optimised for metal and hard-plastic applications; it is not intended for concrete, masonry, wood or tile. For materials with very high hardness beyond the HSS capability or for heavy-duty production drilling at high speeds, carbide or coated drills may be more appropriate.

Key specifications

• Material: High-speed steel (HSS), precision ground
• Tip geometry: 135° split-point, self-centring
• Flute type: Type N (standard flute angle), precision ground
• Shank: Cylindrical, diameter equal to drill diameter
• Manufacturing standard: DIN 338
• Performance: Up to 40% faster drilling and up to 50% lower feed pressure versus standard-ground HSS with chisel edge
• Tolerance: Diameter tolerance h8

How to use

Secure the drill bit in the chuck or drill stand with the cylindrical shank clamped firmly. Select an appropriate cutting speed and feed for the material and diameter; start drilling at low speed to ensure accurate engagement, then increase speed as the split-point centres. Use cutting lubricant when drilling alloyed or stainless steels to extend tool life and improve chip flow. Clear chips regularly to prevent clogging and overheating.

What to consider before purchase

• Intended material: designed for metals and hard plastics, not masonry or wood
• Required hole sizes and tolerance: available with diameter tolerance h8
• Machine compatibility: cylindrical shank suited to drill stands and standard chucks
• Production demands: for very high-speed or high-volume metal drilling consider carbide or coated alternatives

Usage recommendations

Use appropriate cutting fluid for alloyed steels, select correct speed and feed for the diameter, and ensure chip evacuation to maximise drill life and hole quality when using the Bosch HSS twist drill bit.