Osg 8670770 Carbide Screw Machine Drill Bit 7.7mm

Product Description

The OSG 8670770 is a solid carbide screw machine length drill bit designed for high-performance drilling in demanding production environments. Built to Series 6300 standards, it features a 140-degree split point geometry and an EgiAs coating that reduces friction and extends tool life in ferrous and non-ferrous materials. The stub-length body measures 3.11 inches overall, making it well-suited for rigid setups where minimizing deflection is critical. Right-hand cut with a straight-cylindrical shank, this bit is sized at 7.7 mm (0.3031 inches) and is installed by machinists and toolroom technicians working on CNC drilling operations, manual drill presses, and multi-spindle equipment.

This drill bit is intended for screw machine and stub-length drilling applications where a shorter flute-to-shank ratio improves rigidity and accuracy. The 41 mm flute length supports chip evacuation in shallow-to-moderate depth holes. The EgiAs coating performs across a wide range of workpiece materials. Typical use cases include precision hole-making in production machining, metal fabrication shops, and toolroom environments where consistent diameter control at 7.7 mm is required.

Key Features

• Solid carbide construction for superior hardness and wear resistance
• 140-degree point angle reduces thrust and improves self-centering
• EgiAs coating extends tool life and reduces heat buildup at the cutting edge
• R-thinned web reduces cutting resistance and improves chip flow
• Straight-cylindrical shank fits standard drill chucks and collet holders sized for 8.00 mm (0.3150 inch) shanks
• Screw machine (stub) length body increases rigidity and minimizes runout

Compatibility

Designed as a stub-length carbide drill for use in CNC machining centers, drill presses, and screw machines accepting a straight-cylindrical shank. Fits within the OSG Series 6300 drill bit family for the 6.50 mm to 8.00 mm diameter range.

Installation Notes

Installation is performed by machinists and toolroom technicians. Secure the shank fully in a drill chuck or collet holder before operation, and verify runout with an indicator before beginning a production run. Solid carbide tooling is brittle — avoid side loading, interrupted cuts without appropriate feed adjustments, and impact or dropping on hard surfaces. Always follow machine manufacturer feed and speed guidelines when setting up a new tool.