Guhring 9012420072000 Screw Machine Drill Bit 7.2mm

Product Description

The GUHRING 9012420072000 is a solid carbide, screw machine length drill bit designed for high-performance drilling in demanding production environments. Built to DIN 6539 standards, it features a 7.2 mm (0.2835 inch) diameter with a 140-degree split point and web-thinned geometry that reduces thrust and improves entry accuracy. The overall length is 74 mm (2.91 inches) with a 34 mm flute length and a 40 mm straight-cylindrical shank. This bit is suited for machinists, toolroom technicians, and production floor operators working with CNC machines, drill presses, and screw machines.

This drill bit is intended for use in ferrous materials, specifically cast iron and steel. The screw machine length format — shorter than jobber length — provides added rigidity and reduced deflection, making it well suited for close-tolerance hole production in production machining, job shop, and maintenance repair operations. The 3xD flute-to-diameter ratio supports chip evacuation in moderate-depth holes up to 23.2 mm (0.913 inch) maximum drilling depth. Coolant-through capability is not included in this configuration.

Key Features

• Solid carbide submicron-grade construction for wear resistance in steel and cast iron
• 140-degree SU split point with web thinning for reduced thrust and accurate self-centering
• DIN 6539 standard geometry, Series 1242
• Screw machine length for increased rigidity over jobber-length alternatives
• Right-hand cut, two-flute spiral design with parallel web configuration
• Diameter tolerance of plus 0.006 to plus 0.021 mm for consistent hole sizing

Compatibility

Designed as a standard DIN 6539 screw machine length drill bit suitable for use in CNC machining centers, drill presses, and screw machines where a straight-cylindrical shank and 7.2 mm diameter are required. Primary workpiece materials are cast iron and steel.

Installation Notes

Installation and use should be performed by qualified machinists or toolroom personnel. Secure the shank fully in a compatible chuck or collet system rated for the spindle speed appropriate to the workpiece material and bit diameter. Ensure the machine is at a complete stop before changing or inspecting the bit. Do not exceed the maximum drilling depth of 23.2 mm in a single pass without retracting to clear chips.