Twist drill bit Bosch 3.2 mm HSS cobalt for metal, 1 pc

Bosch HSS cobalt twist drill bit, 3.2 mm diameter, designed for drilling metal and hard materials with power drills and drill presses. Made from cobalt-alloyed high-speed steel, this single-piece drill bit offers enhanced heat resistance and wear performance compared with standard HSS drills. The 135° split-point geometry and two-flute design improve centring and chip evacuation, supporting accurate holes in stainless steel, alloyed and non-alloyed steels, cast iron and heat-resistant metals.

Advantages

The cobalt-alloyed HSS material increases hot hardness and extends tool life during continuous drilling in tough metals. The split-point 135° tip reduces walking at the start of drilling and enables active cutting without pre-punching. Two cutters and two flutes ensure efficient chip removal and consistent cutting performance, while the cylindrical shank provides a secure fit in standard chucks and drill stands. Manufactured to DIN 338 tolerances for reliable diameter accuracy.

Suitable for

• Drilling stainless steel sheets, plates and components
• Working with alloyed and non-alloyed steel parts
• Punching holes in cast iron and cast steel
• Drilling acid- and heat-resistant steels in workshop environments
• Use in hand-held power drills and drill presses for metalworking

Key specifications

• Material: cobalt-alloyed high-speed steel (HSS-Co)
• Diameter: 3.2 mm
• Tip geometry: 135° split point for reduced walking
• Flutes: 2 flutes, 2 cutting edges for rapid chip evacuation
• Shank type: cylindrical shank (shank diameter equals drill diameter)
• Manufacturing standard: DIN 338, Type N flute angle
• Diameter tolerance: h8

How to use

Secure the drill bit in the chuck so the shank is fully seated and tightened. Select a drill speed appropriate for the material—lower speeds for stainless and heat-resistant steels to reduce heat buildup. For best results, use cutting fluid or coolant to improve chip evacuation and extend tool life. Apply steady, moderate feed pressure and allow the bit to cut without forcing; back the bit out periodically to clear chips on deep holes.

Usage recommendations

When drilling stainless or heat-resistant steels, keep drill speed low, use cutting lubricant, and avoid excessive pressure to maintain the bit’s hardness and prolong service life. For precise starts, consider a light centre punch or using the split-point geometry without pre-punching when working on thin sheets.