Guhring 9003290031700 Cobalt Stub Drill Bit 1/8 in

Product Description

The GUHRING 9003290031700 is a cobalt stub-length (screw machine length) drill bit designed for high-performance drilling in hard and abrasive workpiece materials. Built to DIN 1897 standards, it features a 130-degree split point with web thinning for reduced thrust and improved centering at entry. The 1/8 inch (0.1250 inch) diameter straight shank design fits standard drill chucks without an adapter. At 1.9291 inches overall length with an 18 mm flute length, this bit is suited for tight-clearance applications where a jobber-length drill would be impractical. Two regular spiral flutes provide efficient chip evacuation during drilling operations.

This bit is intended for use in CNC machining centers, drill presses, and handheld power tools where stub rigidity reduces deflection in short-reach setups. Its cobalt construction makes it a preferred choice when drilling titanium alloys, stainless steels, and other work-hardening materials that would rapidly dull standard high-speed steel tooling. It is commonly specified by machinists and maintenance technicians in aerospace, industrial, and fabrication environments. The bright uncoated finish allows visual wear inspection between uses.

Key Features

• Cobalt construction for drilling titanium alloys and other hard, work-hardening materials
• 130-degree drill point angle with web thinning for reduced entry thrust and self-centering
• Stub length (DIN 1897) at 1.9291 inches OAL for increased rigidity and reduced deflection
• Regular spiral flute with parallel web configuration for consistent chip flow
• Right-hand cut with straight cylindrical shank for universal chuck compatibility
• Maximum drilling depth of 0.5220 inches (13.25 mm)

Compatibility

Designed as a DIN 1897 stub-length drill bit compatible with standard straight-shank drill chucks in CNC machining centers, drill presses, and handheld power tools accepting 1/8 inch shank tooling.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tool safety. Ensure the drill chuck is fully tightened and the workpiece is securely fixtured before beginning any drilling operation. Power down and de-energize the machine before changing or inspecting tooling. Cutting speeds and feeds should be selected per the material being drilled to avoid overheating the bit and reducing tool life.