Chicago-latrobe 49206 Screw Machine Drill Bit 3/32 Hss

Product Description

The CHICAGO-LATROBE 49206 is a screw machine length drill bit designed for high-speed steel cutting in demanding trade and industrial applications. Built to Series 159 specifications, it features a 3/32 inch (0.0938 inch) diameter with a 135-degree split point that reduces walking and allows for faster penetration without a center punch. The web-thinned, parallel web construction reduces thrust and improves chip evacuation. At 1.75 inches overall length with a 0.75 inch flute length, this stub-length bit delivers added rigidity compared to jobber-length bits, making it well suited for high-torque, close-tolerance drilling environments.

This drill bit is intended for right-hand cutting in cast iron and steel workpieces. The screw machine length format is a standard choice in machine shop setups, CNC drilling applications, and production drilling where shorter overall length reduces deflection and improves hole accuracy. It is also used by mechanical contractors, millwrights, and maintenance technicians drilling into structural steel, equipment housings, and ferrous components. The straight-cylindrical shank fits standard drill chucks without adapters. A coated finish provides added surface hardness and wear resistance for extended tool life in repetitive-use scenarios.

Key Features

• 3/32 inch diameter with tight diameter tolerance of +0.0000 to -0.0005 inches for precision fitment
• 135-degree split point reduces thrust and eliminates the need for a center punch on most materials
• Web-thinned parallel web improves chip flow and lowers cutting resistance in steel and cast iron
• Screw machine (stub) length adds rigidity and reduces bit deflection in production drilling
• Heavy-duty grade high speed steel construction rated for continuous use in ferrous materials
• Meets NAS 907 and ISO standards for dimensional and performance consistency

Compatibility

Designed for drilling cast iron and steel workpieces. Fits any standard drill chuck accepting a straight-cylindrical shank. Conforms to NAS 907 and ISO specifications for screw machine length drill bits in the 0.0000 to 0.1000 inch diameter range.

Installation Notes

Install in a drill press, CNC machine, or hand drill with a compatible chuck before powering the tool. Ensure the shank is fully seated and the chuck is tightened with a key before operation. Use appropriate cutting fluid or coolant when drilling steel to extend tool life and maintain hole tolerance. Wear appropriate PPE including eye protection when operating any rotary cutting tool.