Guhring 9003050044500 Cobalt Jobber Drill Bit 4.45 Mm

Product Description

The GUHRING 9003050044500 is a cobalt jobber length drill bit designed for general-purpose drilling in demanding materials including cast iron and steel. It measures 4.45 mm in diameter with an overall length of 80 mm and a flute length of 47 mm. The 118-degree cone relief point geometry and web-thinned tip reduce entry force and improve chip evacuation. Built to DIN 338 standards, this bit carries an h8 diameter tolerance for consistent, repeatable hole sizing. The straight-cylindrical shank and regular spiral flute profile make it compatible with standard drill chucks across a wide range of drilling equipment.

This bit is suited for production and maintenance drilling in ferrous metals, specifically cast iron and steel workpieces. The cobalt substrate provides elevated heat resistance compared to standard high-speed steel, making it a practical choice for harder stock or applications where cutting speeds generate significant heat. It is used by machinists, pipefitters, ironworkers, and maintenance trades requiring a reliable general-purpose drill bit in the 4 mm to 5 mm size range. The Series 305 designation places it within GUHRING's standard jobber length product line conforming to DIN 338 specifications.

Key Features

• Cobalt construction for improved heat and wear resistance in ferrous metals
• 118-degree cone relief point with web thinning for reduced entry force
• DIN 338 standard with h8 diameter tolerance for consistent hole quality
• Regular spiral flute with 5xD flute-to-diameter ratio for effective chip removal
• Straight-cylindrical shank fits standard drill chucks without adapters
• Right-hand cut, two-flute design for conventional clockwise drilling operations

Compatibility

Designed as an OEM-style general-purpose jobber length drill bit compatible with standard straight-shank drill chucks; primary workpiece materials are cast iron and steel per manufacturer specification.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with rotating cutting tools. Secure the shank fully in a properly sized drill chuck before operation and verify chuck key removal before starting the spindle. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life, noting this bit does not support through-tool coolant delivery. Follow applicable shop safety standards and wear appropriate eye and hand protection during drilling operations.