Chicago-latrobe 44393 Drill Bit Letter W 0.386 in Hss

Product Description

The CHICAGO-LATROBE 44393 is a jobber-length drill bit sized to Letter W (0.3860 inches) and manufactured from high-speed steel with a bright, uncoated finish. It features a 118-degree standard point angle and a two-flute regular spiral design with web thinning for improved chip evacuation and reduced thrust at entry. The straight-cylindrical shank measures 0.3860 inches in diameter and 1.375 inches in length. Overall length is 5.125 inches with a flute length of 3.75 inches. This bit is designed for general-purpose drilling and is a standard choice for HVAC, mechanical, and industrial trade work where non-ferrous and general workpiece materials are encountered.

The 44393 is suited for general-purpose drilling in non-ferrous metals, plastics, and similar materials. The jobber-length profile balances reach and rigidity, making it practical for bench drilling, hand-held drill use, and drill press applications. Its DIN 338 compliance means it fits standard jobber-length tooling setups common in trade shops, fabrication environments, and field service work. The bright finish means no coating buildup concerns in sensitive alloy applications.

Key Features

• Letter W size: 0.3860 inches decimal equivalent
• 118-degree standard point angle with web-thinned, tapered web configuration
• High-speed steel construction for general-purpose durability
• Bright uncoated finish — suitable for non-ferrous and general materials
• Right-hand cut, two-flute regular spiral for consistent chip removal
• Meets DIN 338 standard for jobber-length drill bits

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with standard straight-shank drill chucks and keyed or keyless drill press and handheld driver setups that accept a 0.3860-inch shank diameter.

Installation Notes

Secure the shank fully in the chuck before operation and verify chuck key is removed before starting the drill. Use appropriate cutting fluid or lubricant when drilling metals to extend bit life and maintain hole tolerance. Follow applicable shop safety practices and OSHA guidelines for rotating cutting tools. Inspect the cutting edges for wear before each use and replace when point geometry is degraded.