Chicago-latrobe 50421 Taper Length Drill Bit 0.3680 in

Product Description

The CHICAGO-LATROBE 50421 is a taper length, high speed steel twist drill bit designed for general-purpose hole drilling in metalworking applications. It measures 0.3680 inches in diameter, equivalent to Letter Size U, and features a 118-degree standard point angle with web thinning to reduce entry force and improve centering. The overall length is 6.75 inches with a flute length of 4.25 inches, giving it greater reach than a jobber-length bit without sacrificing rigidity. A coated finish helps extend tool life under typical shop conditions. This bit is intended for use by machinists, maintenance technicians, and trade professionals working with drill presses, lathes, or hand-held power tools.

The 50421 is suited for drilling alloy steel, carbon steel, and cast iron in both production and maintenance-repair environments. The taper length format makes it a practical choice when standard jobber bits lack the reach needed for deeper holes or when working in moderately deep fixtures. The straight shank measures 0.3680 inches in diameter and 2.5 inches in length, fitting standard drill chucks without adapters. Series 120 construction follows a regular spiral with a tapered web configuration for consistent chip evacuation across the supported material range.

Key Features

• Letter Size U (0.3680 inches) diameter with a diameter tolerance of +0.0000 to -0.0010 inches
• 118-degree standard point angle with web thinning for improved self-centering
• High speed steel construction for general-purpose metalworking performance
• Taper length format: 6.75 inches overall, 4.25-inch flute for extended reach
• Right-hand cut, regular spiral flute for efficient chip removal
• Coated finish to reduce friction and extend service intervals

Compatibility

Designed as a general-purpose taper length drill bit compatible with standard straight-shank drill chucks. Recommended for use in alloy steel, carbon steel, and cast iron applications as specified by the manufacturer.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with drill press and power tool operation. Secure the shank fully in the chuck and confirm runout before drilling. Always use appropriate cutting fluid or coolant when drilling ferrous metals to prevent premature tool wear. Power down and lock out the machine before changing bits or adjusting workpiece fixturing.