Chicago-latrobe 49205 Screw Machine Drill Bit 5/64 in Hss

Product Description

The CHICAGO-LATROBE 49205 is a screw machine length drill bit designed for precision drilling in cast iron and steel. It features a 5/64 inch (0.0781 inch) diameter, a 135-degree split point, and a web-thinned, parallel web configuration that reduces entry force and improves centering on hard materials. The high-speed steel construction with coating supports heavy-duty performance in production and maintenance environments. With an overall length of 1-11/16 inches and a flute length of 11/16 inch, this stub-length bit offers enhanced rigidity compared to jobber-length tooling. It is suited for machinists, millwrights, and trades professionals working with ferrous metals.

The 49205 is built for screw machine and general-purpose drilling operations where rigidity and accuracy in small-diameter holes are critical. The short flute and compact overall length minimize deflection when drilling cast iron and steel in production settings, manual drill presses, or CNC turret applications. The right-hand spiral flute clears chips efficiently during through-hole and blind-hole operations. This bit meets NAS 907 and ISO standards, making it appropriate for aerospace-adjacent maintenance work and general metalworking applications.

Key Features

• 5/64 inch (0.0781 inch) diameter with tight tolerance of +0.0000 to -0.0005 inches for precise hole sizing
• 135-degree split point reduces walking and lowers thrust force on entry
• Web-thinned parallel web improves chip clearance and cutting efficiency
• High-speed steel with coating for extended tool life on steel and cast iron
• Screw machine (stub) length at 1-11/16 inches overall for maximum rigidity
• Meets NAS 907 and ISO standards for use in regulated manufacturing environments

Compatibility

Designed as a direct-fit screw machine length drill bit for use in manual drill presses, turret lathes, screw machines, and CNC drilling operations involving cast iron and steel workpieces. Series 159 from CHICAGO-LATROBE.

Installation Notes

Installation and use should be performed by qualified machinists or trades professionals familiar with metal drilling operations. Secure the workpiece and ensure the drill chuck is properly tightened before operation. Always power down and de-energize equipment before changing tooling. Use appropriate cutting fluid or coolant for cast iron and steel to prevent premature wear, noting this bit does not support through-coolant delivery.