Widia 4143962 Screw Machine Drill Bit Letter E 1/4 in

Product Description

The WIDIA 4143962 is a screw machine length drill bit in the VDS201A series, sized at letter E (0.2500 inches, or 1/4 inch). It features a titanium aluminum nitride (TiAlN) coating over a straight-cylindrical shank and a two-flute spiral design with web thinning at the tip. The shorter screw machine length body delivers improved rigidity compared to jobber-length bits, making it well suited for high-production drilling in tight-clearance setups. This bit is designed for right-hand cutting and is installed by machinists, tool-and-die professionals, and maintenance technicians working with precision drilling equipment.

This drill bit is intended for general-purpose drilling in a range of materials including steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. The TiAlN coating extends tool life in higher-heat applications such as dry or semi-dry drilling. The screw machine length format fits standard drill chucks and CNC drilling setups where stub-length tooling is preferred for reduced deflection and improved hole accuracy.

Key Features

• Letter E size - 0.2500 inches (1/4 inch) cutting diameter
• TiAlN coating for extended tool life in ferrous and high-temp materials
• Web-thinned point reduces thrust force and improves self-centering
• Two-flute spiral design with regular helix for efficient chip evacuation
• Straight-cylindrical shank at 0.3150 inches diameter fits standard drill chucks
• Maximum drilling depth of 0.9449 inches (3xD flute-to-diameter ratio)

Compatibility

Designed as a general-purpose screw machine length drill bit for use in standard drill chucks, CNC machining centers, and drill presses configured for stub-length tooling. Part of the WIDIA VDS201A series.

Installation Notes

Machinists and tooling technicians should ensure the machine spindle is fully stopped and the chuck is relieved of pressure before inserting or removing this bit. Confirm chuck capacity accommodates a 0.3150-inch shank diameter before installation. For best results in high-hardness materials, verify appropriate feed rates and spindle speeds for TiAlN-coated tooling per the machine manufacturer guidelines. This bit does not support coolant-through delivery; use external coolant or cutting fluid application as needed.