Chicago-latrobe 49219 Screw Machine Drill Bit 19/64

Product Description

The CHICAGO-LATROBE 49219 is a screw machine length drill bit engineered for heavy-duty metal drilling applications. Built from high speed steel with a coated finish, it measures 19/64 inch (0.2969 inches) in diameter and carries a 135-degree split point for fast, self-centering starts with minimal walking. The shortened screw machine length profile keeps rigidity high and deflection low in stub-reach drilling setups. With a web-thinned, parallel-web construction and two spiral flutes in a right-hand cut, this bit is designed for production environments where throughput and hole quality both matter. It meets NAS 907 and ISO standards and is classified under Series 159 heavy-duty tooling.

This bit is suited for drilling cast iron and steel in both production machining and maintenance repair operations. Screw machine length bits are commonly used in drill presses, CNC machining centers, and turret lathes where a shorter-than-jobber profile is required for rigidity and close-tolerance hole location. The straight-cylindrical shank fits standard drill chucks without modification. No coolant-through capability is present, so external cutting fluid application is recommended when drilling harder steels at sustained speeds.

Key Features

• 19/64 inch diameter with a tolerance of +0.0000 to -0.0010 inches for consistent hole sizing
• 135-degree split point with web thinning for reduced thrust and self-centering entry
• High speed steel construction with coated finish for improved wear resistance
• Screw machine (stub) length overall at 2-3/4 inches for maximum rigidity in short-reach applications
• Two spiral flutes with parallel web configuration for efficient chip evacuation
• Meets NAS 907 and ISO specifications for use in controlled-quality production environments

Compatibility

Designed for drilling cast iron and steel workpieces. Fits standard straight-shank drill chucks across drill presses, CNC machining centers, and turret lathes. Suitable for any application requiring a screw machine length bit in the 0.2500 to 0.3000 inch diameter range per Series 159 heavy-duty classification.

Installation Notes

Installation and use should be performed by machinists or maintenance technicians familiar with rotating cutting tool safety. Secure the straight-cylindrical shank firmly in a properly sized drill chuck before operation, and verify chuck key removal before powering the machine. Apply external cutting fluid when drilling steel or cast iron at sustained speeds to extend tool life and maintain hole quality. Inspect the cutting edges and point geometry before each use and remove the bit from service if chipping or excessive wear is observed.