Accupro 4500309 Screw Machine Drill Bit 1/8 in Carbide

Product Description

The ACCUPRO 4500309 is a screw machine length drill bit designed for high-performance drilling in demanding industrial and trade applications. Built from solid carbide and coated with TiAlN (Titanium Aluminum Nitride), it delivers extended tool life and heat resistance in tough materials. The bit measures 1/8 inch (0.1250 inches) in diameter with an overall length of 2.992 inches and a flute length of 1.102 inches. The 140-degree split point and R-thinned web reduce entry force and improve centering without a pilot hole. Coolant-through capability supports high-speed, deep-hole operations where chip evacuation and heat control are critical.

This drill bit is rated for primary use in stainless steels, making it a practical choice for HVAC fabrication, plumbing rough-in work, electrical panel enclosure drilling, and general metal fabrication where smaller-diameter, short-length bits are required. The screw machine length profile keeps the bit rigid and minimizes deflection in CNC machine tools, drill presses, and handheld right-angle drills. It suits shops and field technicians working with sheet metal, structural components, or stainless fixtures that demand consistent hole quality.

Key Features

• Solid carbide construction with TiAlN coating for heat resistance and extended wear life in stainless steels
• 140-degree split point reduces thrust force and self-centers on entry
• R-thinned web improves chip flow and reduces drill walk
• Coolant-through design supports high-speed drilling and deep-hole chip evacuation
• Screw machine (stub) length body provides rigidity and minimizes deflection
• 2-flute spiral configuration with regular spiral for balanced chip removal

Compatibility

Designed as a high-performance screw machine length drill bit suitable for use in CNC machining centers, drill presses, and compatible handheld tooling with a straight-cylindrical shank interface. Primary workpiece material is stainless steels per the manufacturer specification.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trade professionals familiar with cutting tool safety. Ensure the tool is secured in a compatible chuck or collet rated for the 0.2344-inch straight-cylindrical shank diameter before operation. Engage coolant-through supply when available to maximize tool life and chip evacuation. Inspect the cutting edge for chipping or wear before each use and replace if the point geometry is compromised.