Guhring 9055200074900 Cobalt Stub Drill Bit 7.49mm

Product Description

The GUHRING 9055200074900 is a cobalt screw machine length (stub) drill bit designed for high-speed drilling applications in metalworking and industrial environments. Built to DIN 1897 standards, this bit features a 7.49mm diameter with a 118-degree four facet split point for accurate self-centering and reduced thrust. The web-thinned, tapered web construction improves chip evacuation and cutting efficiency. With a straight-cylindrical shank and two regular spiral flutes, this bit seats securely in standard drill chucks. It is intended for use by machinists, tool and die technicians, and maintenance professionals requiring a compact, rigid drill profile.

This stub-length drill bit is suited for close-tolerance drilling in applications where a shorter flute length provides increased rigidity and reduced deflection. The cobalt construction gives it elevated heat resistance compared to standard high-speed steel, making it appropriate for harder workpieces and sustained cutting cycles. The primary workpiece material rating is aluminum, though the cobalt composition supports use across a range of non-ferrous and ferrous materials. A 3xD flute-to-diameter ratio and 22.77mm maximum drilling depth make this bit well matched to shallow-hole production work on CNC machines, drill presses, and manual lathes.

Key Features

• Cobalt tool material for superior heat resistance and wear life compared to standard HSS
• 118-degree four facet split point with web thinning for self-centering and reduced drill thrust
• DIN 1897 stub length for increased rigidity and reduced deflection in tight clearance setups
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Two regular spiral flutes with tapered web configuration for efficient chip removal
• Diameter tolerance of +0.000 to -0.022mm for consistent hole sizing

Compatibility

Designed as an OEM-style replacement and standard production drill bit for use in drill presses, CNC machining centers, and manual lathes accepting a 7.49mm straight-cylindrical shank. Conforms to DIN 1897 stub drill specifications.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or tooling technicians familiar with rotary cutting tools. Ensure the machine spindle and chuck are fully stopped and de-energized before inserting or removing the bit. Confirm the shank is fully seated and the chuck is tightened to the machine manufacturer's specification before beginning any drilling operation. Do not exceed the recommended maximum drilling depth of 22.77mm per pass without retracting to clear chips.