Chicago-latrobe 50552 Extra Length Drill Bit 7/16 in Hss

Product Description

The CHICAGO-LATROBE 50552 is a high speed steel extra length drill bit designed for long reach drilling applications in metal fabrication and industrial maintenance. The bit measures 7/16 inch (0.4375 inch) in diameter with a 10 inch overall length and a 7.5 inch flute length, giving it the reach needed to drill through deep workpieces or reach into recessed bores that standard length bits cannot access. A 118-degree notched point with web thinning reduces thrust and improves center starting accuracy. The oxide finish provides light corrosion resistance during storage and handling. This bit is appropriate for machinists, maintenance technicians, and fabricators working with steel or cast iron.

The 50552 is suited for production and repair drilling in steel and cast iron where extended reach is required. Typical applications include drilling through structural members, deep flanges, heavy-walled tubing, and machine frames where a jobber-length bit would not reach the full depth of the hole. The straight-cylindrical shank accepts standard drill chucks on drill presses, magnetic drills, and hand-held power drills. Right-hand spiral flutes evacuate chips efficiently during through-hole and deep-blind-hole operations.

Key Features

• 10 inch overall length with 7.5 inch spiral flute length for extended reach in deep or obstructed bore locations
• 118-degree notched drill point with web thinning reduces required thrust and improves self-centering on entry
• High speed steel construction maintains hardness and edge life when drilling steel and cast iron
• Oxide finish provides baseline corrosion resistance during storage
• Straight-cylindrical 7/16 inch shank is compatible with standard 3-jaw drill chucks
• Regular right-hand spiral with tapered web geometry supports consistent chip evacuation

Compatibility

Designed as a general purpose extra length drill bit for use in steel and cast iron. Fits any standard drill chuck sized to accept a 7/16 inch straight-cylindrical shank, including those on drill presses, magnetic base drills, and heavy-duty corded hand drills.

Installation Notes

This bit is installed and operated by machinists and maintenance technicians following standard machine tool practices. Secure the shank fully in the chuck and verify concentricity before operation to prevent deflection at extended lengths. Reduce feed rate compared to jobber-length bits when drilling at full depth to minimize bit flex and heat buildup. Use appropriate cutting fluid for steel and cast iron to extend edge life and manage chip load.