Guhring 9055240057900 Cobalt Stub Drill Bit Size 1

Product Description

The GUHRING 9055240057900 is a cobalt screw machine length (stub) drill bit in wire gauge Size 1, equivalent to 0.2280 inches in diameter. Built to DIN 1897 standards from M35 cobalt steel, it features a 118-degree four facet split point and a web-thinned, tapered web configuration that reduces entry force and improves chip evacuation. The straight-cylindrical shank measures 5.79 mm (0.2280 inches) in diameter and the overall length is 66 mm (2.5984 inches). Right-hand spiral flutes and a bright uncoated finish make this bit well-suited for production drilling applications where rigidity and accurate hole entry matter.

This stub-length drill bit is designed for screw machine and short-hole drilling work where reduced length improves rigidity and minimizes deflection. It is a common choice for metalworking operations in aluminum and similar non-ferrous materials. The 3xD flute-to-diameter ratio keeps the bit compact for close-tolerance work in CNC lathes, turret lathes, and automatic screw machines. Maximum drilling depth is 19.32 mm (0.7610 inches). Machinists, tool-and-die shops, and precision manufacturing operations typically stock this series for high-cycle production runs.

Key Features

• M35 cobalt steel construction for heat resistance during high-speed drilling
• 118-degree four facet split point with web thinning for reduced thrust and self-centering entry
• DIN 1897 stub length for maximum rigidity and minimal deflection
• Right-hand spiral flute, regular helix for efficient chip removal in aluminum and non-ferrous metals
• Bright uncoated finish — compatible with cutting fluids and standard machining lubricants
• Straight-cylindrical shank fits standard drill chucks and collets without modification

Compatibility

Designed as an OEM-style replacement or direct stock drill bit for screw machines, CNC turning centers, and turret lathes that accept straight-shank tooling in the 0.2280-inch diameter range conforming to DIN 1897 stub-length specifications.

Installation Notes

Installation and use should be performed by a qualified machinist following applicable shop safety procedures. Ensure the machine spindle is fully stopped and the chuck or collet is properly cleaned before seating the shank. Verify runout after chucking to avoid premature bit wear or oversized holes. Do not exceed the rated maximum drilling depth of 0.7610 inches per pass without retracting to clear chips.