Guhring 9003050110000 Cobalt Jobber Drill 11mm

Product Description

The GUHRING 9003050110000 is a cobalt jobber-length drill bit designed for production and maintenance drilling in ferrous materials. It features an 11.00 mm diameter with a 118-degree cone-relief point, a two-flute right-hand spiral geometry, and a straight-cylindrical shank conforming to DIN 338 standards. The web-thinned tip reduces thrust force at entry, making it well-suited for drilling cast iron and steel where tool life and hole accuracy matter. At 142.00 mm overall length with a 94.00 mm flute length, it covers the dimensional requirements of most general-purpose jobber-drill applications. The cobalt substrate provides elevated heat resistance compared to standard high-speed steel.

This drill bit is intended for general-purpose metalworking in both shop and field settings. Typical applications include drilling cast iron and steel workpieces in manufacturing, fabrication, and mechanical maintenance environments. It is sold individually and is sized for use in standard drill chucks, CNC machining centers, and drill presses that accept straight-cylindrical shanks. The Series 305 designation places it within GUHRING's standard jobber drill line, and the h8 diameter tolerance supports consistent hole quality across production runs.

Key Features

• Cobalt construction for improved heat resistance and extended tool life in ferrous materials
• 118-degree cone-relief point with web thinning to reduce entry thrust
• Two-flute right-hand regular spiral geometry for efficient chip evacuation
• Straight-cylindrical shank at 11.00 mm diameter for broad chuck compatibility
• DIN 338 standard compliance ensures dimensional interchangeability
• Bright/uncoated finish — no coating to chip or flake in interrupted cuts

Compatibility

Designed as a general-purpose replacement or stock jobber drill for applications involving cast iron and steel. Compatible with any drill chuck or collet accepting an 11.00 mm straight-cylindrical shank.

Installation Notes

Install in a properly sized drill chuck or collet and verify runout before production drilling. Power down and secure the workpiece before bit changes. Use cutting fluid appropriate for the workpiece material to maximize tool life when drilling steel. Inspect the cutting edges for wear at regular intervals, particularly when drilling abrasive cast iron grades.