The 3.5mm Cobalt Stub Drill DIN 1897 is a short-length twist drill designed for accurate, straight drilling in metal. Its primary use is producing small-diameter holes in difficult-to-machine materials where rigidity and reduced run-out are required, such as stainless steels, heat-resistant alloys and hardened steels. The stub length minimises deflection compared with jobbers' drills, making it ideal for tight tolerances and shallow holes in jigs, fixtures and component production.

This drill is manufactured from HSS-E cobalt alloy (M35), incorporating approximately 5% cobalt to increase red hardness and abrasion resistance. It is ground to the DIN 1897 stub-drill profile with a bright ground finish and a straight cylindrical shank suitable for standard drill chucks and holders. The cutting geometry features a conventional 118° point angle for general-purpose metalwork and precision starts; the ground flutes provide consistent chip evacuation on small diameters. As a DIN 1897 tool it conforms to the recognised German standard for stub drills, ensuring dimensional and geometric consistency across batches.

Typical applications include drilling pilot holes for tapping, maintenance and repair work, aero and automotive component manufacture, toolroom operations and precision fabrication. The cobalt alloy construction gives significantly improved performance when drilling austenitic stainless steels (such as 304/316), alloy steels and other materials that tend to harden during machining. Use with a suitable cutting fluid will extend tool life and improve surface finish, particularly in stainless and heat-resistant alloys.

Key benefits of the 3.5mm cobalt stub drill are its enhanced heat resistance and wear life compared with conventional HSS, reduced tendency to work-harden the material being drilled, and improved rigidity for accurate, burr-reduced holes. It is compatible with standard straight-shank chucks, drill presses and CNC machines where short-reach drilling is required. Duchy Fasteners stocks this 3.5mm DIN 1897 cobalt stub drill individually and in multi-packs; we also offer a wider range of DIN 1897 HSS-Co stub drills in common metric sizes to suit production and maintenance needs. If you need alternative sizes or pack quantities, please contact our sales team.