Guhring 9055190071400 Cobalt Drill Bit Letter K 9/32

Product Description

The GUHRING 9055190071400 is a cobalt jobber-length drill bit sized to Letter K (9/32 inch, 0.2812 inch decimal), designed for high-performance drilling in metalworking applications. Built to DIN 338 standards from M35 cobalt steel and finished with a Titanium Nitride (TiN) coating, it delivers extended tool life under heat and wear compared to standard HSS bits. The four-facet split point geometry reduces walking at drill entry and lowers thrust force. Two right-hand spiral flutes evacuate chips efficiently across the full 69 mm flute length. Machinists, tool-and-die techs, and maintenance professionals specify this bit where consistent hole quality and coating durability matter.

This bit is suited for drilling aluminum, non-ferrous metals, cast iron, and low-to-medium alloy steels -- workpiece material codes K, M, N, and P per ISO classification. The straight-cylindrical shank at 9/32 inch (7.14 mm) fits standard three-jaw drill chucks without adapters. Typical install environments include CNC drill presses, benchtop drill presses, and hand-held drill motors where a jobber-length bit provides adequate rigidity and reach. The 5xD flute-to-diameter ratio and tapered web with web thinning make it well suited for production or maintenance drilling in fabrication and machine shops.

Key Features

• M35 cobalt steel construction resists heat buildup during extended drilling cycles
• TiN coating extends cutting edge life and reduces friction against workpiece material
• Four-facet split point reduces walking and lowers required feed force at drill entry
• Right-hand, regular spiral flute design promotes efficient chip evacuation
• Web-thinned tapered web reduces torque demand through the cut
• Conforms to DIN 338 standard for consistent dimensional tolerances

Compatibility

Designed as a DIN 338 jobber-length replacement bit compatible with standard straight-cylindrical chuck systems; rated for primary workpiece materials classified under ISO codes K (aluminum alloys), M (stainless), N (non-ferrous), and P (steel).

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard three-jaw drill chuck sized for a 9/32 inch shank. Secure the shank fully in the chuck and verify runout before drilling. Observe manufacturer-recommended speeds and feeds for cobalt bits cutting the target material -- excessive feed rate or inadequate cutting fluid can chip the TiN coating or overheat the cutting edge. Never force a dull bit; re-sharpen or replace to maintain hole tolerance within the specified +0.000 to -0.022 mm diameter tolerance.