Guhring 9005520029000 Stub Drill Bit 0.1142 in Hss

Product Description

The GUHRING 9005520029000 is a stub-length (screw machine length) twist drill bit manufactured from high speed steel and designed for precision drilling in production and machining environments. At 0.1142 inches (2.90 mm) in diameter, it features a 130-degree split point angle and a parabolic flute geometry that promotes efficient chip evacuation and reduces cutting resistance. The web-thinned tip allows the bit to start on center without a pilot hole in most setups. Overall length is 1.811 inches with a flute length of 0.630 inches. This bit is built to DIN 1897 standards and is suited for machinists, tool-and-die technicians, and CNC operators who require consistent, repeatable hole quality in small-diameter work.

This drill bit is optimized for aluminum as its primary workpiece material, though the high speed steel construction supports use in a range of non-ferrous and softer ferrous materials at appropriate speeds and feeds. The stub-length body provides added rigidity compared to jobber-length bits, reducing deflection in short-hole applications. It is well suited for screw machine operations, gang drilling fixtures, and any setup where hole location accuracy and runout control are critical. Maximum drilling depth is 0.459 inches. The straight-cylindrical shank seats in standard drill chucks, collet holders, and screw machine spindles without modification.

Key Features

• Parabolic flute geometry promotes fast chip evacuation and reduces heat buildup in the cut zone
• 130-degree point angle with web thinning enables self-centering entry and reduces thrust force
• Stub-length body (1.811 inches overall) provides greater rigidity and less deflection than jobber-length equivalents
• Bright/uncoated finish is compatible with cutting fluids and does not mask wear indicators
• Manufactured to DIN 1897 specification for consistent dimensional tolerances across production runs
• Diameter tolerance held to +0.000 to -0.014 mm for close-tolerance hole applications

Compatibility

Designed as a DIN 1897 Series 552 stub-length drill bit with a straight-cylindrical shank, this bit fits standard drill chucks, ER collets, and screw machine spindles sized for 0.1142-inch shank diameters. Primary workpiece material is aluminum per manufacturer specification.

Installation Notes

Installation and use should be performed by qualified machinists or toolroom technicians familiar with proper speeds, feeds, and workholding for small-diameter drills. Secure the workpiece firmly before drilling to prevent grab or bit breakage at this diameter. Ensure the spindle and chuck are free of debris and that runout is within acceptable limits before use. Cutting fluid is recommended to extend tool life, even though no through-coolant feature is present on this bit.