Guhring 9055240087300 Cobalt Stub Drill Bit 11/32 in

Product Description

The GUHRING 9055240087300 is a cobalt (M35 grade) stub-length drill bit designed for high-performance drilling in ferrous and non-ferrous materials. Built to DIN 1897 standards, this bit features a 118-degree, 4-facet point with web thinning for reduced thrust and improved chip evacuation. The straight cylindrical shank measures 0.3438 inches in diameter, and the overall length is 3.3071 inches (84 millimeters). Series 5524 geometry includes a regular spiral flute and a tapered web configuration that maintains rigidity across short-length applications. Licensed machinists, tool-and-die technicians, and metalworking professionals will find this bit suited to production drilling where repeatability and bit life are priorities.

This drill bit is engineered for use in screw machine and stub-length drilling operations where reduced overhang and increased rigidity matter. Primary workpiece materials include steel, stainless steel, cast iron, aluminum, and other non-ferrous metals. The straw finish (bright/uncoated) cobalt construction provides heat resistance inherent to M35 cobalt alloy without an additional surface coating, making it appropriate for applications where coating adhesion or contamination is a concern. It is well suited to CNC machining centers, turret lathes, drill presses, and screw machines where a short, stiff bit is preferred over jobber-length tooling.

Key Features

• M35 cobalt steel construction provides elevated heat and wear resistance for drilling hard alloys
• 4-facet, 118-degree point with web thinning reduces entry thrust and improves self-centering
• DIN 1897 stub-length geometry delivers superior rigidity compared to jobber-length bits
• Regular spiral flute (3xD flute-to-diameter ratio) promotes consistent chip removal
• Straight cylindrical shank fits standard drill chucks and collet holders without modification
• No coolant-through required; suitable for dry or flood-cooled machining setups

Compatibility

Designed as an OEM-style replacement or direct-application stub drill for use in standard drill chucks and collet systems accepting a 0.3438-inch straight shank. Compatible with primary workpiece materials including steel, stainless steel, cast iron, aluminum, and non-ferrous alloys per DIN 1897 Series 5524 specification.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the machine spindle is fully stopped and locked out before inserting or removing the bit from the chuck or collet. Verify chuck or collet bore is clean and free of chips to maintain runout within tolerance. Do not exceed the maximum drilling depth of 1.059 inches (26.91 millimeters) per pass without retracting to clear chips.