Guhring 9006580039000 Cobalt Jobber Drill Bit 3.9 Mm

Product Description

The GUHRING 9006580039000 is a cobalt jobber-length drill bit with a titanium nitride (TiN) coating, designed for high-performance drilling in demanding materials. Measuring 3.9 mm (0.1535 inches) in diameter with a 2-15/16-inch overall length, this bit features a 130-degree split point and a parabolic flute profile that promotes efficient chip evacuation and reduced heat buildup. The right-hand cutting direction and web-thinned tip reduce entry force on tough substrates. Machinists, toolroom technicians, and maintenance professionals specify this bit for production and maintenance drilling where standard HSS tooling falls short.

This drill bit is engineered for use on cast iron and steel workpieces, making it well suited for metal fabrication shops, maintenance and repair operations, and general machining environments. The straight-cylindrical shank fits standard drill chucks across benchtop drill presses, CNC machining centers, and hand-held drilling equipment. The Series 658 designation follows DIN 338 standards, placing it in a recognized jobber-length specification class for consistent interchangeability. Its 5xD flute-to-diameter ratio supports drilling depths up to approximately 1.46 inches (37.15 mm) without step drilling.

Key Features

• Cobalt construction with TiN coating for extended tool life in ferrous materials
• 130-degree point angle with web thinning for reduced thrust and cleaner entry
• Parabolic flute geometry promotes fast chip removal and reduces clogging
• Right-hand cut, straight-cylindrical shank fits standard drill chucks
• Conforms to DIN 338 jobber-length standard for dimensional consistency
• Diameter tolerance of -0.018 to 0.000 mm for close-tolerance hole work

Compatibility

Designed as a DIN 338 jobber-length drill bit suitable for use in standard drill chucks on manual drill presses, CNC machining centers, and hand-held drilling equipment. Primary workpiece materials are cast iron and steel.

Installation Notes

Installation and use should be performed by a qualified machinist or toolroom technician familiar with cutting tool selection and machine operation. Ensure the drill chuck is securely tightened and the workpiece is clamped before beginning any drilling operation. Power down or de-energize the machine before changing or inspecting tooling. Do not exceed the recommended maximum drilling depth of 1.46 inches without withdrawing the bit to clear chips.