Chicago-latrobe 46091 Jobber Drill Bit No. 21 Hss 118 Deg

Product Description

The CHICAGO-LATROBE 46091 is a jobber-length drill bit in wire gauge size No. 21, equivalent to 0.1590 inches in diameter. Made from high-speed steel with a bright uncoated finish, this bit is built for general-purpose drilling in steel and similar materials. It features a 118-degree standard point angle, a fast spiral flute design, and a straight-cylindrical shank. Overall length is 3.25 inches with a flute length of 2.125 inches. The two-flute configuration provides efficient chip evacuation and consistent hole geometry across a wide range of applications.

This bit is suited for use in production shops, maintenance and repair operations, and field service environments where small-diameter precision holes are required. The No. 21 wire gauge size is commonly used for tapping prep, close-tolerance hole placement, and light fabrication work in ferrous metals. It is compatible with standard drill chucks and is designed for use with benchtop drill presses, handheld electric drills, and CNC drilling equipment. Machinists, pipefitters, and maintenance technicians will find this size frequently called for in metal fabrication and mechanical assembly tasks.

Key Features

• Wire gauge No. 21 drill bit size at 0.1590 inches decimal diameter
• High-speed steel construction for durability in ferrous metal drilling
• 118-degree standard point angle for broad general-purpose compatibility
• Fast spiral flute geometry promotes efficient chip removal
• Bright uncoated finish allows easy visual inspection of cutting edge wear
• Straight-cylindrical shank fits standard 3-jaw drill chucks

Compatibility

Designed as an OEM-style general-purpose replacement and stock drill bit for use in standard drill chucks accepting straight-cylindrical shanks up to 0.1590 inches in diameter. Part of the Chicago-Latrobe Series 150B jobber-length line.

Installation Notes

Install into a properly sized chuck and tighten securely before operation. Ensure the workpiece is clamped or fixtured to prevent movement during drilling. Use appropriate cutting fluid or lubricant when drilling steel to extend bit life and maintain hole quality. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.