Guhring 9055240127000 Cobalt Stub Drill Bit 0.5 in

Product Description

The GUHRING 9055240127000 is a cobalt stub-length drill bit designed for high-performance drilling in demanding shop and field applications. Built to DIN 1897 specification, this bit measures 0.5 inches (12.70 mm shank diameter) with an overall length of approximately 4.02 inches and a flute length of approximately 2.01 inches. The M35 cobalt steel construction provides elevated heat resistance compared to standard high-speed steel, making it well suited for harder workpiece materials and interrupted cuts. A four-facet split point geometry reduces walking and thrust force at entry, while the web-thinned, tapered web design improves chip evacuation and reduces torque demand during penetration.

This drill bit is intended for screw machine (stub) length drilling applications where rigidity and accuracy matter more than deep-hole reach. Its primary listed workpiece material is aluminum, though M35 cobalt construction supports use across a broader range of metals in machine shop, production drilling, and maintenance-repair environments. The 3xD flute-to-diameter ratio and regular spiral flute geometry suit general-purpose drilling operations on lathes, drill presses, and CNC machining centers. It is installed and used by machinists, tool-and-die tradespeople, and industrial maintenance technicians.

Key Features

• M35 cobalt steel construction for heat resistance and extended tool life in metalworking applications
• Four-facet split point with web thinning reduces thrust, minimizes walking, and improves entry accuracy
• Stub (screw machine) length provides increased rigidity over jobber-length bits for tight-tolerance drilling
• Bright/uncoated finish with straight-cylindrical shank for direct chuck mounting without adapter
• Right-hand cut, regular spiral flute for standard chip evacuation in through and blind holes
• Manufactured to DIN 1897 specification for consistent dimensional accuracy

Compatibility

Designed as an OEM-style replacement and standard tooling option for 0.5 inch straight-shank drill chucks on drill presses, lathes, screw machines, and CNC machining centers requiring DIN 1897 stub-length drill bits.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance technicians familiar with rotary cutting tools. Ensure the machine spindle is fully stopped and locked out before inserting or removing the bit from the chuck. Verify chuck jaw engagement across the full shank diameter and confirm runout is within acceptable limits before beginning a drilling operation. Consult machine manufacturer guidelines and applicable OSHA standards for speeds, feeds, and personal protective equipment requirements.