Twist drill bit Bosch Metal drill bit HSS-Co DIN 338 diameter 2.5 mm

The Bosch Metal drill bit HSS-Co DIN 338, diameter 2.5 mm, is a high-speed steel cobalt drill designed for precision drilling in metal. Supplied as a 10-piece set, these twist drill bits are intended for use in drill stands or pillar drills and are suitable for a wide range of ferrous and non-ferrous materials including alloyed and non-alloyed steel, stainless steels V2A/V4A, cast iron and cast steel, as well as acid- and heat-resistant steels, up to a tensile strength of 1000 N/mm².

Advantages

HSS-Co construction gives increased heat and wear resistance compared with standard HSS bits, extending tool life during demanding drilling tasks. The DIN 338 geometry provides precise cutting and stable centring, while the 2.5 mm diameter is suitable for small, accurate holes. The set format (10 pieces) ensures consistent replacements for repeated or professional use.

Suitable for

• Precision metalworking in drill stands or pillar drills
• Drilling alloyed and non-alloyed steels up to 1000 N/mm²
• Working with stainless steel grades V2A and V4A
• Drilling cast iron and cast steel
• Processing acid- and heat-resistant steels

Key specifications

• Brand: Bosch
• Type: Twist drill bit, HSS-Co (cobalt)
• Standard: DIN 338
• Diameter: 2.5 mm
• Pack size: 10 pieces
• MPN: 2608585875
• EAN: 3165140521109

How to use

Mount the 2.5 mm HSS-Co twist drill bit in a drill stand or pillar drill and secure the workpiece. Use appropriate cutting speeds and feed rates for the material being drilled; reduce speed for stainless, acid- or heat-resistant steels to limit heat build-up. Apply cutting fluid or coolant when drilling tough or heat-sensitive materials to improve chip evacuation and extend drill life. Clear chips regularly and avoid side loading to maintain hole accuracy.

Recommendations

For best results, choose the Bosch Topline quality when drilling high-demand parts; use the standard professional quality for general workshop tasks. Always wear appropriate eye protection and follow machine safety guidelines.