Guhring 9003050041700 Cobalt Jobber Drill Bit 4.17mm

Product Description

The GUHRING 9003050041700 is a cobalt jobber length drill bit designed for general-purpose drilling in demanding metal fabrication and machining applications. Built to DIN 338 standards, this bit features a 118-degree cone relief point and a web-thinned tip geometry that reduces thrust and improves chip clearance at entry. The overall length is 75 mm, with a flute length of 43 mm and a maximum drilling depth of 36.75 mm (1.447 inches). The straight-cylindrical shank measures 4.17 mm in diameter (0.1642 inches decimal), making it compatible with standard drill chucks. Cobalt construction provides elevated heat resistance compared to standard high-speed steel, supporting use in harder ferrous workpiece materials without coolant-through capability required.

This drill bit is suited for production and maintenance drilling in cast iron and steel workpieces. The Series 305 designation places it within a well-established jobber-length line used by machinists, fabricators, and maintenance technicians in both shop and field environments. The right-hand spiral flute with regular helix geometry handles general drilling tasks efficiently. At 0.1642 inches in decimal diameter, this bit covers common hole sizes in the 0.1500 to 0.2000 inch range, making it a practical choice when metric-to-inch crossover sizing is needed on mixed-spec jobs.

Key Features

• Cobalt construction for improved heat resistance in steel and cast iron drilling
• 118-degree cone relief point with web-thinning for reduced entry thrust
• DIN 338 standard jobber length with 75 mm OAL and 43 mm flute length
• Straight-cylindrical shank (4.17 mm diameter) fits standard drill chucks
• Right-hand cut, regular spiral flute for efficient chip evacuation
• Bright uncoated finish; no coolant-through required

Compatibility

Designed as a general-purpose jobber length drill bit for use in cast iron and steel workpieces, suitable for standard drill presses, CNC machining centers, and handheld drills accepting straight-cylindrical shanks in the 4.17 mm (0.1642 inch) diameter range.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trade professionals familiar with rotary cutting tool safety. Secure the shank fully within the chuck and verify concentricity before operation. Always wear appropriate eye protection and ensure the workpiece is firmly clamped before drilling. Follow machine manufacturer guidelines for spindle speed and feed rate appropriate to the workpiece material and bit diameter.