Guhring 9055200045000 Stub Drill Bit No 16 Cobalt

Product Description

The GUHRING 9055200045000 is a stub-length (screw machine length) cobalt drill bit designed for high-speed drilling in aluminum and other non-ferrous and ferrous materials where a short, rigid cutting tool is required. Built to DIN 1897 standards, it features a 118-degree four-facet split point with web thinning for reduced thrust and improved self-centering on entry. The straight-cylindrical shank measures 4.50 mm (0.1772 inches) in diameter and the overall length is 58.00 mm (2.2835 inches). The cobalt construction provides heat resistance that outlasts standard high-speed steel in demanding production drilling applications. This bit is installed by machinists, tool-and-die professionals, and maintenance technicians.

This drill bit is suited for screw machine operations, CNC drilling, and bench drill press work where a short flute length provides greater rigidity and reduced deflection compared to jobber-length bits. Its 24.00 mm flute length and maximum drilling depth of 17.25 mm make it appropriate for shallow-hole production work. Primary workpiece material is aluminum, though the cobalt substrate handles harder materials in intermittent-duty use. The Series 5520 designation places it in the GUHRING stub-length cobalt line, sold individually.

Key Features

• DIN 1897 stub length for increased rigidity and reduced deflection in close-tolerance drilling
• 118-degree four-facet split point with web thinning reduces entry thrust and improves self-centering
• Cobalt construction resists heat buildup during high-feed or dry-drilling operations
• Right-hand cut with regular spiral flutes for efficient chip evacuation in aluminum
• Tapered web configuration adds core strength along the full flute length
• Diameter tolerance of +0.000 to -0.018 mm supports close-fit hole requirements

Compatibility

Designed as an OEM-style replacement or direct-use stub drill bit for standard straight-shank drill chucks and collet systems accepting a 4.50 mm (0.1772 inch) shank diameter; compatible with any drill press, CNC machining center, or hand drill capable of holding a straight-cylindrical shank in the No. 16 wire gauge size range.

Installation Notes

Install in a drill chuck or collet rated for the 4.50 mm shank diameter, ensuring the shank is fully seated and the chuck key is fully tightened before operation. Ensure the spindle is at a full stop before inserting or removing the bit. Use appropriate cutting fluid or coolant when drilling ferrous materials to extend tool life, noting that this bit does not support through-coolant. Inspect the cutting edges for wear or chipping before each use, as a damaged point will affect hole diameter tolerance and surface finish.