Guhring 9003050077500 Cobalt Jobber Drill Bit 7.75mm

Product Description

The GUHRING 9003050077500 is a cobalt jobber length drill bit designed for general-purpose drilling in ferrous materials. It carries a 7.75 mm diameter (0.3051 inches) with a 118-degree cone relief point and a web-thinned tip for easier penetration and reduced thrust. The overall length is 117 mm (approximately 4.61 inches), with a flute length of 75 mm (approximately 2.95 inches) and a straight-cylindrical shank. Built to DIN 338 standards, this bit is suited for production and maintenance drilling where consistent hole geometry and tool life are priorities. It is sold individually and is installed by machinists, tool-and-die technicians, and maintenance trades.

This drill bit is rated for use in cast iron and steel (material codes K and P). It fits standard drill chucks accepting a 7.75 mm straight-cylindrical shank. The Series 305 designation places it in the GUHRING jobber-length cobalt line, built for general-purpose drilling at moderate to high spindle speeds. Typical applications include through-hole and blind-hole drilling on machine tools, drill presses, and hand-held drill motors in light manufacturing and MRO environments. Maximum drilling depth reaches 63.38 mm (approximately 2.50 inches).

Key Features

• Cobalt construction for improved heat and wear resistance in steel and cast iron
• 118-degree cone relief point with web thinning for reduced entry force
• Right-hand spiral flute with regular helix for efficient chip evacuation
• Straight-cylindrical shank with h8 diameter tolerance for precise chuck fit
• Conforms to DIN 338 standard for consistent jobber-length geometry
• Bright uncoated finish — compatible with cutting fluids or dry drilling

Compatibility

Designed as a general-purpose jobber-length drill bit suitable for use in cast iron and steel workpieces. Compatible with standard drill chucks accepting a 7.75 mm straight-cylindrical shank on drill presses, CNC machining centers, and hand-held drill motors.

Installation Notes

Install in a properly sized drill chuck and verify shank seating before operation. Ensure workpiece is securely clamped before drilling. Apply appropriate cutting fluid when drilling steel to extend tool life and maintain hole tolerance. Inspect the cutting edges and web-thinned point for wear or chipping before each use; a dull or damaged tip will produce oversized or out-of-round holes.