Chicago-latrobe 50720 Extra Length Drill Bit 3/16 in Hss

Product Description

The CHICAGO-LATROBE 50720 is an extra length high speed steel drill bit designed for long reach drilling applications in metal fabrication and maintenance work. Built to Series 120X specifications, it features a 3/16 inch (0.1875 inch) diameter with an 8 inch overall length, giving it the reach needed to bore through deep sections or confined assemblies where standard length bits fall short. The oxide finish provides basic corrosion resistance and helps reduce friction during cutting. A notched point geometry and web-thinned tapered web reduce entry force and improve chip clearance at the start of the cut.

This bit is suited for drilling cast iron and steel in production, maintenance, and fabrication environments. The extra length makes it a practical choice for through-drilling structural members, deep flanges, or assemblies where a standard jobber-length bit cannot reach the full bore depth. The 5 inch shank length provides secure chuck engagement even when the full reach of the bit is in use. Right-hand spiral flute geometry clears chips efficiently during through-hole drilling operations.

Key Features

• 3/16 inch diameter with 8 inch overall length for deep-reach drilling
• High speed steel construction rated for cast iron and steel workpieces
• Oxide finish reduces friction and provides light corrosion resistance
• Notched point with web-thinned tapered web lowers thrust and improves centering
• 118-degree drill point angle suited for general purpose metal drilling
• Two-flute right-hand spiral design promotes efficient chip evacuation
• Diameter tolerance held to +0.0000 to -0.0007 inch for consistent hole sizing

Compatibility

Designed as a general purpose extra length drill bit for use in standard three-jaw chucks and drill press setups where a 3/16 inch diameter, straight-cylindrical shank bit is required for long reach applications in cast iron and steel.

Installation Notes

Install in a drill press, milling machine, or hand drill with a chuck rated for the shank diameter. Secure the full available shank length in the chuck to minimize runout and deflection during long-reach operations. Apply appropriate cutting fluid when drilling steel to extend tool life and maintain hole quality. Follow shop safety protocols and applicable OSHA machine guarding requirements when operating rotating cutting tools.