Osg HP243-0669 Screw Machine Drill Bit 0.0669 in Carbide

Product Description

The OSG HP243-0669 is a screw machine length drill bit engineered for high-performance drilling in ferrous materials. Built from solid carbide with a TiAlN coating, it delivers extended tool life in demanding production environments. The bit measures 0.0669 inches (1.70 mm) in diameter with a 140-degree drill point angle and a right-hand spiral flute. Overall length is 40.00 mm with a 10.00 mm flute length. The straight-cylindrical shank measures 3.00 mm in diameter. R-thinned web geometry reduces thrust and improves chip evacuation. This bit is suited for machinists and toolroom professionals running screw machine or CNC drilling operations.

The HP243-0669 is designed for drilling steel, alloy steel, and cast iron. Its screw machine length profile makes it a practical choice for short-reach, high-rigidity applications on lathes, screw machines, and machining centers where stub-length stability is preferred over jobber-length reach. The 3xD flute-to-diameter ratio supports chip clearing in moderate-depth holes without coolant-through capability, making it suitable for operations where external coolant or mist is applied at the cutting zone.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• TiAlN coating extends tool life under heat and abrasion
• 140-degree drill point angle reduces thrust and walking on entry
• R-thinned web for lower cutting force and improved chip flow
• Tapered web configuration with regular spiral flute for consistent chip evacuation
• Straight-cylindrical shank fits standard collets and drill chucks

Compatibility

Designed for use in steel, alloy steel, and cast iron workpiece applications. Compatible with standard 3.00 mm straight-cylindrical shank toolholders, collets, and drill chucks used on CNC machining centers, lathes, and screw machines.

Installation Notes

Installation and use of this bit should be performed by a qualified machinist familiar with small-diameter carbide tooling. Secure the shank fully in a properly sized collet or drill chuck before operation to prevent runout damage. Carbide is brittle — avoid side loads, interrupted cuts without appropriate feed adjustments, and impact during handling or storage. Apply external coolant or cutting fluid at the entry point when drilling steel or cast iron to manage heat buildup, as this bit does not support coolant-through delivery.