Guhring 9012420078000 Screw Machine Drill Bit 0.3071in

Product Description

The GUHRING 9012420078000 is a solid carbide screw machine length drill bit designed for high-performance drilling in demanding shop and production environments. Built to DIN 6539 standards, this Series 1242 bit features a 140-degree split point (SU point type) with web thinning for reduced thrust and cleaner entry. The 7.80 mm (0.3071 inches) diameter and 2-flute spiral design make it well-suited for right-hand cutting in cast iron and steel. Machinists, tool-and-die workers, and production drilling operators are the primary users of this bit.

This drill bit is engineered for screw machine length applications, offering a compact overall length of 79.00 mm with a 37.00 mm flute length and a maximum drilling depth of 0.9960 inches (25.30 mm). The 3xD flute-to-diameter ratio suits through-hole and blind-hole operations in cast iron and steel workpieces. The straight-cylindrical shank fits standard drill chucks and collet holders, making it compatible with CNC machining centers, drill presses, and turret lathes commonly found in production and job shop settings.

Key Features

• Solid carbide submicron-grade construction for rigidity and wear resistance in ferrous materials
• 140-degree SU split point with web thinning reduces entry thrust and improves hole accuracy
• Coated finish extends tool life in cast iron and steel cutting applications
• DIN 6539 standard geometry ensures consistent, repeatable performance
• Parallel web configuration with regular spiral flute for reliable chip evacuation
• Straight-cylindrical shank provides secure seating in standard chucks and collets

Compatibility

Designed as a DIN 6539 Series 1242 screw machine length drill bit with a straight-cylindrical shank, this bit is suitable for use in standard drill chucks and collet systems accepting a 7.80 mm shank diameter. Primary workpiece materials are cast iron and steel.

Installation Notes

This bit is installed and operated by machinists and production drilling personnel. Ensure the machine spindle is fully stopped and locked out before inserting or removing the bit from the chuck or collet. Confirm chuck or collet bore matches the shank diameter before tightening to prevent runout. Use appropriate cutting fluid or coolant recommendations per the workpiece material, and inspect the cutting edge for wear or chipping before each use.