Guhring 9012420083300 Screw Machine Drill Bit 21/64 in

Product Description

The GUHRING 9012420083300 is a screw machine length solid carbide drill bit designed for high-performance drilling in steel and cast iron. It measures 21/64 inches (0.3281 inches) in diameter with an overall length of 3.11 inches (79.00 mm) and a 140-degree split-point geometry for accurate self-centering entry. The web-thinned cone relief point reduces thrust and improves chip evacuation. A TiN coating extends tool life in ferrous materials. This bit is intended for use by machinists, tool and die technicians, and industrial maintenance professionals working with CNC machines, drill presses, and screw machine operations.

This drill bit is built for production drilling in ferrous workpiece materials, specifically steel and cast iron. The screw machine length format — shorter than jobber length — provides increased rigidity and reduced runout, making it well-suited for close-tolerance work in machine tool applications. The straight cylindrical shank is compatible with standard drill chucks and collet systems. With a flute length of 1.46 inches (37.00 mm) and a maximum drilling depth of 0.965 inches (24.51 mm), it is appropriate for through-hole and blind-hole operations within those parameters.

Key Features

• Solid carbide construction with submicron-grade material for hardness and wear resistance
• TiN coating for extended tool life in steel and cast iron applications
• 140-degree cone relief point with web thinning for reduced entry thrust and self-centering
• Screw machine length body provides increased rigidity over jobber-length bits
• Regular spiral, 2-flute design promotes consistent chip evacuation
• Manufactured to DIN 6539 specification, Series 1242

Compatibility

Designed for use in standard drill chucks and collet holders accepting a 0.3281-inch straight cylindrical shank. Primary workpiece materials are steel and cast iron. Conforms to DIN 6539 dimensional standards.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tools and machine tool operation. Ensure the machine spindle is fully stopped and the tool is properly seated and secured in the chuck or collet before initiating a cut. Do not exceed the maximum drilling depth of 0.965 inches without retracting to clear chips. This bit does not support coolant-through delivery; use external coolant or cutting fluid as appropriate for the workpiece material.