Guhring 9003290019900 Drill Bit Size 47 Cobalt Stub

Product Description

The GUHRING 9003290019900 is a cobalt screw machine length (stub) drill bit in wire gauge Size 47, with a decimal inch diameter of 0.0785 inches. Built to DIN 1897 standards, it features a 130-degree cone-relief point with web thinning for reduced thrust and cleaner entry into hard materials. The two-flute regular spiral design evacuates chips efficiently during short-hole drilling operations. At 38.00 mm (1.4961 inches) overall length with a 12.00 mm flute length, this bit is designed for production drilling in confined spaces or screw machine setups where rigidity matters more than depth. It weighs 0.05 pounds.

This drill bit is suited for drilling steel, stainless steel, cast iron, and high-temperature alloys in both production shop and maintenance environments. The stub-length format provides added rigidity compared to jobber-length bits, making it a practical choice for CNC screw machines, turret lathes, and bench drill press work where hole depth requirements are shallow. The cobalt construction handles work-hardening materials that would prematurely dull standard high-speed steel tooling. Licensed machinists and toolroom technicians are the primary installers and users of this tooling.

Key Features

• Cobalt construction for drilling steel, stainless steel, cast iron, and high-temp alloys
• 130-degree cone-relief point with web thinning reduces entry thrust and improves centering
• Stub length (DIN 1897) adds rigidity for short-hole production drilling
• Bright/uncoated finish compatible with cutting fluids and coolant systems
• Straight cylindrical shank fits standard drill chucks and collet holders accepting 0.0783-inch shank diameter
• Diameter tolerance of +0.000 to -0.014 mm for consistent hole sizing

Compatibility

Designed as an OEM-style stub-length drill bit for use in screw machines, turret lathes, and drill presses accepting straight-shank tooling in the Size 47 wire gauge range. Primary workpiece materials per manufacturer specification are steel, stainless steel, cast iron, and high-temperature alloys.

Installation Notes

This bit is installed by machinists or toolroom technicians into a drill chuck or collet rated for the 0.0783-inch straight shank diameter. Ensure the machine spindle is fully stopped and the tool is properly seated and tightened before initiating a cut. Use appropriate cutting fluid or coolant for the workpiece material, particularly when drilling stainless steel or high-temperature alloys, to prevent work hardening at the cutting edge. Inspect the point and flutes for wear before each use, as cobalt tooling in hard materials can show edge degradation that is not always visible to the naked eye.