Precision Twist Drill 5999309 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999309 is a screw machine length drill bit designed for high-speed steel cutting in demanding shop and field applications. Sized at 0.040 inches in diameter (Wire Size 60), it features a 118-degree standard point angle and a bright/uncoated finish. The right-hand spiral flute geometry, combined with a tapered web and web-thinned point, reduces cutting resistance and improves chip evacuation. At 1-3/8 inches overall length with a 1/2-inch flute length, this short-body bit provides added rigidity for accurate hole placement in tight setups. Licensed machinists, tool-and-die techs, and HVAC fabricators rely on this Series R41 bit for precision small-diameter work.

This drill bit is suited for use in CNC machining centers, drill presses, and hand-held power tools where short, rigid drill geometry is required. The screw machine length format is commonly specified when drilling close-tolerance holes in metal components, including titanium as noted in the product specifications. The 0.040-inch diameter corresponds to Wire Gauge 60, a common size in precision metalworking, electronics manufacturing, and HVAC sheet metal fabrication. It conforms to ANSI standards and is rated as a general-purpose, high-performance cutting tool.

Key Features

• 0.040 inch diameter, Wire Size 60, for precision small-hole drilling
• High speed steel construction provides hardness and wear resistance
• 118-degree standard point angle suits a wide range of metal workpieces
• Web-thinned, tapered web reduces thrust and improves penetration
• Screw machine length body adds rigidity and reduces deflection
• Bright/uncoated finish, right-hand cut, ANSI-compliant Series R41

Compatibility

Designed as an OEM-style replacement and standard stock drill bit for use with conventional drill chucks accepting straight-cylindrical shanks in screw machine, CNC, and manual drilling applications involving small-diameter holes in metal.

Installation Notes

This bit is installed by machinists and tool technicians using standard 3-jaw drill chucks or collet systems compatible with straight-cylindrical shanks. Ensure the drill chuck is fully tightened and the workpiece is securely fixtured before drilling. Use appropriate cutting fluid or dry cutting practice per the workpiece material requirements. Inspect the cutting edges for wear or chipping before each use, particularly at this small diameter where edge damage is harder to detect visually.