Guhring 9055200025800 Cobalt Stub Drill Bit 0.1015 in

Product Description

The GUHRING 9055200025800 is a cobalt stub-length (screw machine length) drill bit designed for precise, high-performance drilling in metalworking and machining applications. Built to DIN 1897 specifications, this Series 5520 bit features a 118-degree four-facet split point with web thinning for reduced thrust and self-centering entry. The straight-cylindrical shank measures 2.58 mm in diameter, and the overall tool length is 43.00 mm with a flute length of 14.00 mm. The cobalt construction provides elevated heat resistance and edge retention, making it well-suited for harder or abrasive workpiece materials. Licensed HVAC technicians, machinists, and maintenance trades reach for cobalt stub bits when working in tight clearances or on short-reach drilling operations.

This bit is sized at wire gauge 38, which corresponds to a decimal diameter of 0.1015 inches. It carries a right-hand spiral flute with a regular helix and a tapered web configuration. The stub-length body keeps the bit rigid under load, reducing deflection on shallow holes up to a maximum drilling depth of 0.3990 inches (10.13 mm). The 3xD flute-to-diameter ratio supports chip evacuation without sacrificing stiffness. Primary intended workpiece material per manufacturer specification is aluminum, though the cobalt substrate handles a broad range of non-ferrous and ferrous stock.

Key Features

• 118-degree four-facet split point with web thinning for self-centering and reduced feed force
• Cobalt tool material for superior heat and wear resistance compared to standard HSS
• DIN 1897 stub-length geometry for rigidity in tight-clearance drilling
• Right-hand cut, regular spiral flute for efficient chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks and collet holders
• Tapered web with web thinning to extend tool life and lower thrust requirements

Compatibility

Designed as a DIN 1897 stub-length replacement drill bit in Series 5520, sized for wire gauge 38 (0.1015 inches decimal). Fits standard drill chucks and collet systems accepting a 2.58 mm straight-cylindrical shank. Manufacturer lists aluminum as the primary workpiece material; the cobalt substrate is also appropriate for general-purpose drilling in non-ferrous and mild ferrous materials.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance trade professionals following applicable shop safety procedures. Secure the shank fully in a properly sized chuck or collet before operation, and verify spindle speed is appropriate for the bit diameter and workpiece material. Inspect the cutting edges for chips or wear before each use; a damaged point should be reground or the bit replaced. Do not exceed the rated maximum drilling depth of 0.3990 inches per pass without retracting to clear chips.