Chicago-latrobe 50476 Extra Length Drill Bit 0.2031in Hss

Product Description

The CHICAGO-LATROBE 50476 is a high speed steel extra length drill bit designed for long reach drilling applications where standard-length bits cannot access the work zone. Built to Series 120X specifications, this bit features a 118-degree notched point with web thinning for easier penetration and reduced thrust. The oxide finish provides mild corrosion resistance and helps with chip evacuation. At 8 inches overall length with a 5.5-inch spiral flute, it gives tradespeople and machinists extended reach without sacrificing concentricity or cutting performance. Diameter is 0.2031 inches with a straight-cylindrical shank of equal diameter.

This bit is suited for production and maintenance drilling in cast iron and steel workpieces where depth or obstruction requires additional reach beyond a jobber-length bit. Typical applications include structural fabrication, mechanical assembly, and maintenance repair operations where access is limited. The right-hand cutting direction and regular spiral flute type make it compatible with standard drill press, hand drill, and CNC spindle setups. It is commonly selected by machinists, millwrights, and maintenance technicians working in industrial and commercial environments.

Key Features

• 118-degree notched point with web thinning reduces entry thrust in cast iron and steel
• 8-inch overall length enables long reach drilling in deep or obstructed bore locations
• High speed steel construction maintains hardness through elevated cutting temperatures
• Oxide finish provides mild lubricity and corrosion resistance during storage and use
• Straight-cylindrical shank fits standard 3-jaw chucks without adapter
• Tapered web configuration with 2-flute spiral design supports efficient chip removal

Compatibility

Designed as a general-purpose extra length drill bit for use in cast iron and steel. Compatible with standard 3-jaw drill chucks accepting a 0.2031-inch straight-cylindrical shank. Diameter tolerance is +0.0000 to -0.0007 inches.

Installation Notes

Installation and operation should be performed by a qualified machinist or skilled tradesperson familiar with rotating cutting tools. Secure the shank fully in the chuck and verify runout before cutting. Always power down and lock out the drill press or machine spindle before changing bits. Use appropriate cutting fluid for steel workpieces to extend tool life and maintain hole tolerance.