Guhring 9055200030000 Cobalt Stub Drill Bit 0.1181 in

Product Description

The GUHRING 9055200030000 is a cobalt stub-length (screw machine length) drill bit with a 0.1181 inch (3.00 mm) diameter and a 118-degree four-facet split point. Built to DIN 1897 standards, it features a web-thinned, tapered-web construction that reduces thrust during entry and improves centering. The two-flute spiral design with a straight-cylindrical shank suits precision drilling in tight-clearance setups on drill presses, CNC machines, and screw machines. At 46.00 mm overall length and 16.00 mm flute length, the stub geometry provides extra rigidity compared to jobber-length bits, making it well-suited for production environments where deflection and chatter must be minimized.

This bit is designed primarily for drilling aluminum and other non-ferrous materials, though the cobalt construction extends tool life when encountering harder alloys. The stub length format is a common choice for machine shop production runs, fixture work, and applications where spindle clearance is limited. Series 5520 covers the 0.1000 to 0.1500 inch diameter range, and this 3.00 mm variant falls within that family. The 3xD flute-to-diameter ratio and a maximum drilling depth of 0.4530 inch (11.50 mm) make it appropriate for shallow, repeatable through-holes and blind holes in tight-tolerance work.

Key Features

• Cobalt tool material for improved heat and wear resistance over standard high-speed steel
• 118-degree four-facet split point with web thinning reduces entry thrust and improves self-centering
• Stub length (DIN 1897) provides increased rigidity and reduced deflection versus jobber-length bits
• Straight-cylindrical shank compatible with standard drill chucks and collet systems
• Two spiral flutes with regular helix promote efficient chip evacuation
• Diameter tolerance of +0.000 to -0.014 mm supports close-tolerance hole requirements

Compatibility

Designed as an OEM-style stub-length drill bit conforming to DIN 1897, suitable for use in standard drill press chucks, CNC machining center toolholders, and screw machine spindles that accept a 3.00 mm straight-cylindrical shank.

Installation Notes

Installation and use should be performed by a qualified machinist or tool-and-die professional familiar with cutting tool setup and speeds-and-feeds selection. Secure the shank fully in the chuck or collet before operation and verify runout before beginning a production run. Always power down and lock out the machine spindle before changing tooling. Do not exceed the maximum drilling depth of 0.4530 inch per pass without retracting to clear chips.