Osg 8670780 Screw Machine Drill Bit 0.3071 in Carbide

Product Description

The OSG 8670780 is a solid carbide screw machine length drill bit designed for high-performance drilling in demanding shop and production environments. Built to Series 6300 specifications, it features a 140-degree split point, a right-hand spiral flute, and an R-thinned web for reduced thrust and improved chip evacuation. The straight-cylindrical shank measures 8.00 mm in diameter and seats securely in standard drill chucks and toolholders. At 0.3071 inches (7.80 mm) in diameter, this bit is suited for precision hole work where dimensional accuracy and tool life are critical priorities.

This drill bit is intended for use in ferrous materials including steel, alloy steel, and cast iron. The screw machine length body keeps the tool compact and rigid, making it well suited for CNC machining centers, drill presses, and production drilling fixtures where stub-length rigidity reduces deflection. The coated solid carbide construction extends tool life compared to HSS alternatives, particularly in abrasive or work-hardening materials. Machinists, tool-and-die technicians, and CNC operators in job shops and production facilities are the primary users.

Key Features

• Solid carbide construction for extended tool life in ferrous materials
• 140-degree point angle reduces thrust and improves self-centering
• R-thinned web minimizes chisel edge for easier entry
• Regular spiral flute with tapered web configuration for consistent chip flow
• Straight-cylindrical shank compatible with standard drill chucks and collet holders
• Screw machine (stub) length provides added rigidity and reduced deflection

Compatibility

Designed for drilling steel, alloy steel, and cast iron. Suitable for use in applications requiring a drill bit in the 0.3000 to 0.3500 inch (6.50 to 8.00 mm) diameter range. Compatible with standard drill chucks and toolholders accepting an 8.00 mm straight-cylindrical shank.

Installation Notes

Installation and use of this drill bit is typically performed by machinists and CNC operators in accordance with applicable shop safety procedures. Ensure the machine spindle is fully stopped and locked out before inserting or removing the bit from the chuck or collet. Verify shank seating and runout before initiating a cut. Do not exceed the recommended feed and speed parameters for the workpiece material and machine type.