Guhring 9055200123000 Cobalt Stub Drill Bit 31/64

Product Description

The GUHRING 9055200123000 is a cobalt stub-length (screw machine length) drill bit designed for high-performance drilling in demanding shop and field applications. Built to DIN 1897 standards, it features a 118-degree four-facet split point that reduces walking and lowers thrust requirements at the start of the cut. The two-flute spiral configuration with web thinning and a tapered web promotes efficient chip evacuation. At 31/64 inch (0.4844 inches) in diameter with a straight cylindrical shank, this bit fits standard drill chucks without an adapter. Cobalt construction provides heat resistance beyond standard HSS, making it the right choice when cutting harder or abrasive materials.

This stub-length drill bit is sized for applications where a shorter flute-to-diameter ratio improves rigidity and reduces deflection. It is well suited for production drilling, repair shops, and fabrication environments where hole accuracy and bit longevity matter. The primary workpiece material rating covers aluminum, though cobalt construction extends usable life across a range of metals encountered in mechanical, HVAC, plumbing, and electrical trade work. A maximum drilling depth of 1.281 inches (32.55 mm) aligns with the stub-length geometry and the 3xD flute-by-diameter ratio.

Key Features

• Cobalt construction resists heat buildup during extended or interrupted cuts
• 118-degree four-facet split point reduces bit walking and entry thrust
• Web-thinned tapered web improves chip flow and lowers cutting resistance
• Stub length (DIN 1897) geometry increases rigidity and reduces deflection versus jobber-length bits
• Straight cylindrical shank fits standard drill chucks and press collets
• Right-hand cut, two-flute spiral flute design for conventional CW drilling

Compatibility

Designed as a DIN 1897 stub-length drill bit with a straight cylindrical shank; fits any standard drill chuck accepting a 12.30 mm (approximately 0.484 inch) shank diameter. No specific model or system compatibility data was provided in the product input.

Installation Notes

Installation and use of this bit should be performed by a qualified machinist, maintenance technician, or trade professional familiar with drilling equipment. Secure the shank fully in the chuck jaws before operation and verify chuck key removal before starting the spindle. Always wear appropriate eye protection and secure the workpiece to prevent rotation. Follow applicable shop safety procedures and equipment manufacturer guidelines for speed and feed settings based on workpiece material.