Chicago-latrobe 50424 Taper Length Drill Bit 0.3970 in

Product Description

The CHICAGO-LATROBE 50424 is a taper length, straight-shank twist drill bit designed for general-purpose hole making in metalworking applications. Built from high speed steel with a coated finish, this bit features a 118-degree standard point angle and a web-thinned, tapered web configuration that reduces cutting effort at entry. The 0.3970-inch diameter corresponds to letter size X. With a 7-inch overall length and a 4.375-inch flute length, it reaches deeper than a jobber-length bit while maintaining rigidity. Licensed HVAC, plumbing, and electrical tradespeople as well as machining professionals will recognize this as a dependable general-purpose option for production or maintenance drilling.

This drill bit is suited for drilling alloy steel, carbon steel, and cast iron in both shop and field environments. The right-hand spiral flute evacuates chips efficiently during through-hole and blind-hole operations. The straight shank, measuring 0.3970 inches in diameter and 2.625 inches in length, seats securely in standard three-jaw drill chucks found on benchtop drill presses, handheld drills, and magnetic base drills. It is sold as a single unit and is appropriate for general-purpose metalworking tasks where taper length reach is required.

Key Features

• Letter size X, 0.3970-inch diameter with a tight tolerance of +0.0000 to -0.0010 inches
• 118-degree standard point angle with web-thinned, tapered web for easier starting
• High speed steel construction with coated finish for improved surface hardness and wear resistance
• Taper length body at 7 inches overall with a 4.375-inch spiral flute for extended reach
• Right-hand cut with regular spiral flute for efficient chip evacuation
• Straight shank compatible with standard drill chucks - no coolant-through requirement

Compatibility

Designed for use in alloy steel, carbon steel, and cast iron drilling applications. Fits any standard three-jaw chuck sized to accept a 0.3970-inch straight shank.

Installation Notes

Installation is performed by a machinist, maintenance technician, or trade professional using a drill press, handheld drill, or magnetic base drill. Secure the shank fully in the chuck and verify runout before drilling. Always power down and de-energize the tool before changing bits. Use appropriate cutting fluid or lubrication when drilling steel to extend bit life and maintain hole tolerance.