Guhring 9003290190000 Stub Drill Bit 19mm Cobalt

Product Description

The GUHRING 9003290190000 is a stub-length (screw machine length) cobalt drill bit designed for high-performance drilling in tough ferrous materials. Built to DIN 1897 standards, it measures 19.00 mm (0.7480 inches) in diameter with a 5.0 inches overall length and a 130-degree cone relief point geometry. The M35 cobalt steel construction and oxide finish give it the heat resistance needed for demanding applications. Web thinning and a tapered web configuration reduce entry force and improve chip evacuation. This bit is intended for installation by machinists, maintenance technicians, and metalworking tradespeople working on production or repair applications.

This drill bit is suited for drilling steel, stainless steel, cast iron, and high-temperature alloys in both production and maintenance environments. The stub-length (screw machine) format provides added rigidity compared to jobber-length bits, making it a preferred choice when working in tight clearances or when minimizing deflection is critical. It is compatible with standard drill presses, CNC machining centers, and hand-held drilling equipment accepting straight-cylindrical shanks. The Series 329 designation identifies this as part of GUHRING's DIN 1897 stub drill lineup.

Key Features

• M35 cobalt steel construction handles elevated cutting temperatures in ferrous and high-temp alloy materials
• 130-degree cone relief point reduces thrust force and improves centering on hard materials
• Web-thinned, tapered web design lowers entry resistance and aids chip flow
• Oxide finish provides corrosion resistance and reduces friction at the cutting edge
• Stub-length (screw machine) format maximizes rigidity and minimizes deflection
• Diameter tolerance of +0.000 to -0.033 mm for consistent, repeatable hole sizing

Compatibility

Designed as a DIN 1897 stub-length replacement or direct-fit drill bit for applications requiring a 19.00 mm straight-shank cobalt drill. Primary workpiece materials include steel, stainless steel, cast iron, and high-temperature alloys.

Installation Notes

Installation and use should be performed by qualified machinists or metalworking technicians familiar with drilling speeds and feeds for cobalt tooling. Secure the straight-cylindrical shank firmly in the chuck or collet before operation to prevent slippage and runout. Do not exceed the maximum drilling depth of 2.5197 inches (64.00 mm) per the flute length specification. Ensure cutting fluid or coolant is applied at the surface when drilling stainless steel or high-temperature alloys to extend tool life, noting this bit does not support through-coolant delivery.