Guhring 9055240084300 Cobalt Stub Drill Bit 8.43mm Q

Product Description

The GUHRING 9055240084300 is a cobalt stub-length (screw machine length) drill bit in Letter size Q, with an 8.43 mm diameter and a 118-degree four-facet split point. Manufactured from M35 cobalt high-speed steel with a bright uncoated finish, this bit is web-thinned with a tapered web configuration for reduced thrust and cleaner entry. It carries a straight-cylindrical shank and right-hand spiral flutes, with an overall length of 79 mm (3.11 inches) and a maximum drilling depth of 24.36 mm (0.96 inches). This bit conforms to DIN 1897 and is suited for machinists, tool-and-die shops, and maintenance technicians working with stub-length tooling setups.

The 9055240084300 is designed for drilling aluminum and similar non-ferrous or light alloy workpiece materials where stub-length rigidity reduces deflection in short-hole applications. The shorter flute length of 37 mm (1.46 inches) and compact overall length provide increased stiffness compared to jobber-length bits, making this series appropriate for CNC machining centers, drill presses, and manual machine operations where tool overhang must be minimized. Series 5524 from Guhring follows DIN 1897 geometry standards.

Key Features

• M35 cobalt steel construction provides heat resistance in demanding drilling applications
• Four-facet split point at 118 degrees reduces walking and lowers thrust force at entry
• Web-thinned, tapered web design improves chip evacuation and cutting efficiency
• Stub-length body (79 mm overall) increases rigidity and reduces deflection
• Straight-cylindrical shank at 8.43 mm (0.3319 inches) fits standard drill chucks
• Bright uncoated finish suitable for use with cutting fluids on aluminum and light alloys

Compatibility

Designed as an OEM-style stub-length drill bit conforming to DIN 1897, suitable for use in standard straight-shank drill chucks and collet systems that accept an 8.43 mm (0.3319 inch) shank diameter.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tools. Secure the shank fully in the chuck and verify runout before cutting. Always use appropriate cutting fluid for the workpiece material and operate within the machine spindle speed range recommended for cobalt tooling at this diameter. Inspect the cutting edges and point geometry before each use and replace the bit if chipping or wear is observed.