Guhring 9006590042500 Cobalt Stub Drill Bit 0.1673 in

Product Description

The GUHRING 9006590042500 is a cobalt stub-length (screw machine length) drill bit designed for demanding metal drilling applications. Manufactured to DIN 1897 standards, this Series 659 drill bit features a 0.1673-inch (4.25 mm) diameter with a 130-degree split-point angle and web-thinned tip geometry that reduces thrust and improves hole entry accuracy. The M35 cobalt steel construction provides elevated heat and wear resistance, making it well suited for cutting hard and abrasive materials. Two spiral flutes with a regular helix promote efficient chip evacuation during drilling. The bit weighs approximately 0.009 pounds.

This drill bit is rated for primary use in titanium alloy workpieces and is applicable across other difficult-to-machine metals including stainless steel and high-strength alloys. The stub-length body offers increased rigidity compared to jobber-length bits, reducing deflection in short-reach setups such as drill presses, CNC machining centers, and manual screw machine operations. It is most commonly installed by machinists, toolroom technicians, and industrial maintenance professionals working in manufacturing and precision fabrication environments.

Key Features

• M35 cobalt steel construction for heat and wear resistance in hard-metal drilling
• 130-degree point angle with web-thinned tip reduces entry thrust and improves centering
• Stub (screw machine) length body increases rigidity and minimizes deflection
• Two regular spiral flutes promote chip clearance throughout the cut
• Straight-cylindrical shank fits standard drill chucks without adapters
• Manufactured to DIN 1897 standard with h8 diameter tolerance for consistent sizing

Compatibility

Designed as an OEM-style replacement or direct-use stub drill bit for applications requiring a 4.25 mm (0.1673-inch) diameter hole in titanium alloy and other hard metals. Falls within the Series 659 size range of 0.1500 to 0.2000 inch (3.50 to 5.00 mm) diameter bits manufactured to DIN 1897 specification.

Installation Notes

Installation is performed by machinists and toolroom technicians. Secure the straight-cylindrical shank firmly in a drill chuck or collet before operation, and ensure the spindle is fully stopped before changing bits. Follow applicable OSHA machining safety standards and wear appropriate eye and face protection. Do not exceed the recommended maximum drilling depth of 0.6150 inches (15.63 mm) for this stub-length bit without retracting to clear chips.