The 3.0mm Cobalt Stub Drill to DIN 1897 is a short‑length twist drill designed for accurate, repeatable holemaking in tougher materials. Its primary use is through‑and‑blind drilling where a short flute length improves rigidity and positional accuracy compared with jobber drills, making it ideal for small, precise holes in stainless steels and other hard alloys.

This drill is manufactured from cobalt‑alloy high speed steel (HSS‑E, typically M35 grade) and is supplied to the DIN 1897 stub‑drill specification. It has a cylindrical (plain) shank to fit standard chucks and collets, a 118° point geometry as specified by the standard, and precision ground flutes for clean chip evacuation. The bright ground finish reduces friction at the cutting lips; split‑point or 135° finish variants are available where reduced “walking” and improved centreless starts are required.

Typical applications include drilling austenitic and martensitic stainless steels, nickel‑based alloys, hardened steels in the medium hardness range and engineering steels used in the automotive, aerospace, oil & gas and general engineering sectors. The short stub length minimises deflection in handheld drills, drill presses and CNC machines, providing improved concentricity and repeatable hole size in production and maintenance environments.

The key benefits of the cobalt HSS construction are retention of hardness at elevated cutting temperatures, improved wear resistance and extended tool life compared with standard HSS. While the tool steel itself is not stainless, the bright finish offers modest protection against surface corrosion; good practice is to store drills dry and to use appropriate lubricants or cutting fluids when machining stainless or heat‑resistant alloys. Compatibility is broad: the plain shank fits standard drill chucks and collets and the DIN 1897 form ensures interchangeability with other stub‑drill tooling.

Duchy Fasteners holds a broad range of DIN 1897 HSS cobalt stub drills in metric sizes and offers single items and multi‑pack options to suit workshop or production needs. If you require alternative point profiles or mixed sets, please contact us for availability.