Guhring 9006580030500 Cobalt Jobber Drill Bit No. 31

Product Description

The GUHRING 9006580030500 is a cobalt jobber-length drill bit in wire gauge size No. 31, with a decimal diameter of 0.1201 inches. It features a titanium nitride (TiN) coating over a cobalt steel body, offering increased surface hardness and extended tool life in production drilling applications. The 130-degree split point with web thinning reduces thrust and improves centering without a pilot hole. The parabolic flute geometry promotes efficient chip evacuation in deeper holes. This bit is designed for professional machinists, tool-and-die workers, and maintenance technicians who require consistent, tight-tolerance holes in ferrous and cast materials.

This drill bit is suited for drilling cast iron and steel in job shop, manufacturing, and maintenance-repair-operations (MRO) environments. The Series 658 designation identifies it as a high-performance DIN 338 standard bit, making it a direct fit for CNC drill presses, manual drill presses, and hand-held drilling equipment with a straight-shank chuck. The 2-9/16 inch overall length and straight-cylindrical shank are consistent with standard jobber-length tooling setups across light and medium-duty drilling stations.

Key Features

• Cobalt steel construction with TiN coating for extended wear resistance in ferrous materials
• 130-degree point angle with web thinning for reduced entry thrust and self-centering performance
• Parabolic flute profile for fast, clean chip evacuation in cast iron and steel
• DIN 338 standard geometry ensures dimensional interchangeability with standard jobber-length tooling
• Straight-cylindrical shank compatible with standard 3-jaw drill chucks
• Diameter tolerance of -0.018 to 0.000 mm for consistent, repeatable hole sizing

Compatibility

Designed as an OEM-style replacement and production tooling option for applications requiring a wire gauge No. 31 jobber-length drill bit per DIN 338. Primary workpiece materials include cast iron and steel.

Installation Notes

Installation and use should be performed by qualified machinists or tooling technicians familiar with rotary cutting tools. Secure the straight-cylindrical shank fully in a keyed or keyless 3-jaw chuck before operation, and confirm the spindle speed is appropriate for the workpiece material and bit diameter before engaging the cut. Do not exceed the maximum drilling depth of 1.237 inches without retracting to clear chips. Inspect the cutting edges and TiN coating before each use; discard the bit if chipping or coating degradation is observed.