Bosch HSS-Co DIN 338 Twist Drill Bit, 2.5 mm

This 1-piece Bosch HSS-Co DIN 338 twist drill bit, 2.5 mm, is designed for boring accurate holes in heavy-duty metals. The tool uses high-speed steel alloyed with cobalt to improve wear resistance during continuous operation. Tradespeople and DIY users can use the bit across a range of tough workshop and installation substrates. It handles demanding applications where excessive heat generation would compromise standard accessories. A robust material composition maintains consistent cutting performance as workpiece hardness increases.

Following the DIN 338 profile, the drill bit delivers reliable dimensional accuracy for precise installation work. A two-flute twist body supports efficient material removal as the tool progresses through the metal. This physical structure prevents debris build-up, which reduces friction and protects the cutting surface. Standard rotary drills accept the bit directly, so it can be used on site without specialised adapters. The functional design focuses on repeatable, straightforward metal penetration.

• 2.5 mm drilling diameter with a 30 mm active working length and 57 mm overall length.
• HSS-Co construction rated for stainless steel, unalloyed steel, grey cast iron, heat-resistant steel, and hard plastic.
• 135° split-point geometry provides direct centring to eliminate wandering on smooth surfaces.
• 2.5 mm cylindrical shank fits directly into standard drill chucks without slipping.
• Two distinct cutting edges shear through tough alloys while clearing chips rapidly.