Guhring 9055190010700 Cobalt Jobber Drill Bit No. 58

Product Description

The GUHRING 9055190010700 is a cobalt jobber-length drill bit in wire gauge size No. 58, delivering a cutting diameter of 0.0420 inches. The bit features a titanium nitride (TiN) coating over an M35 cobalt steel body, extending tool life when drilling through abrasive and work-hardening materials. The 118-degree four-facet split point provides positive self-centering on entry and reduces thrust force during drilling. With a two-flute spiral design and web-thinned tapered web, chip evacuation is efficient even at small diameters. This is an OEM-grade precision bit conforming to DIN 338, intended for use by machinists, tool and die technicians, and maintenance professionals.

This drill bit is suited for production and maintenance drilling in metalworking applications. The TiN coating and M35 cobalt base material make it appropriate for aluminum, cast iron, mild steel, and stainless steel workpieces per the K, M, N, and P material group classifications. The straight-cylindrical shank seats securely in standard drill chucks and collet holders. With a maximum drilling depth of 12.40 mm and an overall length of 36.00 mm, this bit is designed for shallow, precise holes in small-diameter work such as tapping pilots, light fabrication, and instrument or electronic component assemblies.

Key Features

• M35 cobalt steel construction for heat and wear resistance in demanding alloys
• Titanium nitride (TiN) coating reduces friction and extends cutting edge life
• 118-degree four-facet split point for self-centering entry without a center punch
• Web-thinned tapered web reduces drilling torque and improves chip flow
• DIN 338 standard geometry ensures dimensional consistency and interchangeability
• Straight-cylindrical shank compatible with standard drill chucks and collet holders

Compatibility

Designed as an OEM-style replacement conforming to DIN 338 for use in standard drill chucks and collet holders accepting a 1.07 mm straight-cylindrical shank. Suitable for workpiece material groups K, M, N, and P as classified under standard DIN material coding.

Installation Notes

This bit is installed by machinists and maintenance technicians using a drill press, CNC machining center, or handheld power tool with an appropriate collet or chuck. Ensure the machine spindle is fully stopped and locked out before changing tooling. At small diameters, run speed should be set appropriately to avoid bit deflection or breakage — consult a standard speeds-and-feeds reference for the specific workpiece material. Coolant through is not supported on this bit; flood coolant or cutting oil applied externally is recommended for ferrous materials.