Guhring 9055200048000 Cobalt Stub Drill Bit 0.189 in

Product Description

The GUHRING 9055200048000 is a cobalt stub-length (screw machine length) drill bit designed for precise, high-performance drilling in production and maintenance environments. Built to DIN 1897 standards, this 0.189-inch diameter bit features a 118-degree four-facet split point for fast penetration and reduced walking on entry. The two-flute spiral design with web-thinning and a tapered web configuration promotes efficient chip evacuation. The straight-cylindrical shank measures 4.80 millimeters in diameter, fitting standard drill chucks without adapters. At 0.015 pounds, it is a lightweight, single-piece consumable suited for machinists, HVAC fabricators, and metal trades professionals requiring consistent, repeatable hole quality.

This bit is rated for primary use in aluminum and is well suited to short-reach drilling applications where a stub-length tool reduces deflection and improves hole accuracy. The Series 5520 designation places it within a standardized cobalt-coated line built for repetitive production drilling. A maximum drilling depth of 0.74 inches (18.80 millimeters) and a flute-to-diameter ratio of 3xD make it appropriate for through-holes and shallow blind holes in sheet stock, brackets, and structural components. Wire gauge size 12 corresponds to the 0.189-inch decimal diameter for cross-referencing legacy drill charts.

Key Features

• Cobalt tool material with coating for improved heat and wear resistance
• 118-degree four-facet split point reduces thrust and minimizes drill walk
• Web-thinned tapered web for easier chip clearance in short flute length
• DIN 1897 stub-length standard for reduced deflection in close-tolerance work
• Right-hand cut, two-flute spiral geometry suitable for aluminum and similar non-ferrous workpieces
• No coolant-through design — compatible with standard benchtop and floor drill presses

Compatibility

Designed as an OEM-specification stub-length drill bit conforming to DIN 1897, suitable for use in standard drill press chucks, CNC machining centers, and hand-held drill motors accepting a straight-cylindrical shank. Primary workpiece material rating is aluminum per supplier specification.

Installation Notes

Install in a properly sized chuck and confirm shank is fully seated before operation. Secure the workpiece firmly to prevent movement during drilling. Inspect cutting edges before use and replace when wear reduces hole quality or increases feed force. Follow applicable shop safety protocols including eye protection and chip guarding when operating drilling equipment.